Outboard fuel pumps

In this video I do a couple of crude fuel pump tests using a pressure gauge and then replace the one-way valves in a four stroke EFI Mercury low-pressure pump. I also show the metal reed valves in a Yamaha fuel pump from a two stroke motor.
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[@joeg.cintron4226]

Excellent and ageless video - helped us troubleshoot and repair our Mercury 30hp, 4 stroke, EFI fuel pump. Amazing how we can count on you mates from down under and not from our own here in the USA! Thank you so much!

[@DangarMarine]

You're welcome Joe. :)

[@stefanoskoufidis]

I had exactly the same problem with the fuel pump in three boats, and it took weeks for the mechanics to understand what the problem was. The engines would be running and then suddenly there would be a power loss, like a lack of petrol. We changed everything: petrol tanks, pipes, everything. We even changed the high-pressure pump, but in the end, it was a mechanical pump. One of the plastic gaskets was off. The confusion was as when the problem was happening and i was turning the key off and starting the engine again the boat would run perfectly fine, but after an hour or more, the problem would return. I bought three new pumps as the Mercury dealer in Greece said there was no repair kit . I am extremely happy that my boat and engines work perfectly again. Thank you for the wonderful video.

[@caleymcglynn725]

have to say, really appreciate your uploads. no boat experience, just bought a boat and with your videos i have serviced the impeller, carby, shaft seals, lower unit oil change. and now the fuel pump. thanks very much stu

[@DangarMarine]

Glad to help. :)

[@AhmedAdly11]

Your videos have made me a hero :) In Egypt, we have hundreds of live aboard dive boats and each boat has a couple of RIBs with 40HP yamahas. Now our sailors over here have hearts of solid gold, but they are pretty careless with our equipment. We all suffer terribly with keeping the outboards well maintained. So after watching your videos, I started doing these odd jobs and it has had a huge impact. Sailors from other boats keep coming over for me to fix theirs!!! Thanks for the greta videos!

[@DangarMarine]

Great to hear! Someone has to keep these old motors going. :)

[@jeremybro7016]

This plus the VST video saved me a fortune. Local marine shop couldn't figure out what was going on. These two videos were exactly what I needed to do it myself on a 60/40 EFI mercury jet. Thank you SO much! Very valuable videos.

[@DangarMarine]

You're welcome Jeremy, glad to hear the vids saved you some money. :)

[@Jubi316]

Here from America , I just recently rebuilt my Mariner 200hp had the block bored and had new pistons , bearings and more . Runs like a beast . I've been a mechanic for alittle over 20 years but still learning everyday , lol

[@DangarMarine]

Nice one, glad to hear is running well after the rebuild. You're dead right though, there is always something new to learn!

[@badger305]

If you don't mind telling, how much was the rebuild versus the price of a new 200hp engine?

[@ronaldcach2779]

Thanks again Stu, you are a life saver. Ron from Michigan USA

[@ronaldarevalo3513]

Great video!!! I have been having fuel problems I just changed the priming bulb and it didn’t work so now this will be my next thing to check. Again thank you sir you are a big help and I did learn a lot from your video.

[@DangarMarine]

You’re welcome, good luck!

[@esurcylimaf4335]

Great video Stu, you always make things clear and seem easy. Thank you for your tips. I often suggest your channel as reference when people are asking for certain outboard problems, Cheers Rob

[@DangarMarine]

Thanks Rob, glad you liked it and always appreciate people spreading the word. :)

[@joemole5135]

Awesome video this video explained how the fuel pumps work didn't know much before it. I wish you would put videos up more often like two or three times a week don't worry about editing them just put them up real time I'll still enjoy them a lot thanks

[@DangarMarine]

Hey Joe, glad you liked the video. I am working on finding a way to make more time for at least one mid week video each week. I had started doing short "quick tip" videos and I really need to get back to that.

[@DangarMarine]

Oh, and I also have the 'dangarstu' Instagram account for little midweek bits and pieces.

[@emtdanny520]

thank you for you time to make this videos.

[@2sheetstothewind484]

Very informative. Gotta buy you another Fosters. Bought an `86 90hp merc w/16ft runabout. Been running good gas and Sea Foam. Got it going 36mph top speed. Gonna rebuild/replace the fuel pump for maintenace. Hope to get more speed but I think that`s all she`s good for (36mph).

[@DangarMarine]

Thanks mate, glad the vids have been helping you. :)

[@greggaaron1542]

Hey I just wanted to say thank you for all your videos very informative you do a really great job thank you again

[@JimGrady67]

Great videos! The one on the VST really helped me with my 2003 Merc 40hp 4 stroke. I was also surprised to see I can buy a new low pressure fuel pump for cheaper (96USD) than a company wanted for the rebuild kit (120USD). Thats if they had the right kit number. Keep up the great videos!

[@DangarMarine]

Thanks Jim. It's weird sometimes with parts. It also pays to look first as the prices can sometimes be surprising.

[@captaindon2967]

Sent this Vid to my friend perfect for his motor- Thanks Stu

[@DangarMarine]

Glad it helped

[@nickbeard2821]

Dangar Stu every new youtube account I make your the first channel I sub to. I'm trying to diagnose my 25 efi merc right now and I'm pretty sure its the pump.

[@brenth7774]

Wow, extremely thorough on the wire wheel about the old loctite at 8:15 Great job on that.

[@Augn-ff3dp]

Dammit mate I needed this 18 hours ago.. Thanks for the video regardless all great info once again.. Successfully cleaned and tuned my carbys just from a couple of ur videos so far, confidence inspiring indeed. Saved me a few hundred atleast

[@DangarMarine]

I've heard that a few times! I had been meaning to do this one for a few weeks too... Glad to hear the videos have been saving you money. :)

[@gmcbride6306]

Great video. I noticed on my old pump that after removing it to test it you can pump the button plunger that goes in the motor and feel if it holds suction with your finger over the pickup side and feel the pressure on the outlet side if the pump is good.

[@dtrutza]

Great video as always. Really enjoy watching them, and I learned a lot. Thx

[@TimsWorkshopTJY]

hey that looks just like my 4hp yamaha fuel pump I thought was leaking internally but was the cheesy finger clamps. changed them out with SS clamps like you showed on one of you other videos. the hand pump is a must have for pressure leaks. good video. Thanks

[@DangarMarine]

Thanks mate, those pump / gauges sure are useful, that's for sure. :)

[@darrylpechey9162]

Thanks for pulling the Yamaha pump apart. Now I see why a lot of places just sell the pump diaphragm.

[@DangarMarine]

Yeah, it is certainly the most common part to fail.

[@maxspain46]

@@DangarMarine where can i order the Diaphragms?

[@WillsGarage91]

Great work Stu!

[@DangarMarine]

Thanks Will! :)

[@ksc5522]

Cant stop watching the second hand on the clock

[@johncarilloiii7828]

Excellent video, as was the VST service video. Would like to see more. Learned a lot. Do a video on servicing a 60 hp efi outboard. Love the tips and tricks!

[@irvingguerrero6052]

Great video as usual. I am motivated to trouble shoot my Yamaha fuel issue. Thanks

[@mattfoss423]

Comedy gold stu.. hahah I have no idea how you manage to keep a straight face!!

[@DangarMarine]

Anything's possible with editing! :)

[@ductran7058]

I learned so much from your video. Si fu.

[@LifesAdventures555]

Haahaaahaaa!! I think this is the first time I have been made to laugh while viewing a marine repair video! So you gave him the shirt off your back!! Love it!!

[@Fireship1]

Another great video from you Stu. I have two of these guys on my Yamaha 150. I was told both were replaced for preventive maintenance, but now I know how to test and overhaul them if needed. They are less of a mystery to me now! We have ethanol blended fuel here in the US that isn't the best for boat fuel systems. I wish that they would go back to good old regular gasoline!

[@gnrphil]

Easy way to check those is by loosening the mounting bolts a bit and then give the primer bulb a squeeze, if they're bad fuel will leek out of the hole in the back that Stu pointed out in the vid. They're easy to rebuild but a new one is only $40. Don't tighten the mounting bolts up too tight, they only need about 6 ft lbs or so.

[@DangarMarine]

That's a nice quick check for a leak in the diagram, I like that.

[@ronpowell2373]

Yeah, we have ethanol fuel here and the government mandated that all service stations must sell it. However along with that law is that the blend is a maximum of 10% and bowsers have to be marked (in most cases it is very poorly marked, and hidden by other 'power words' ). So generally if you stick to the major brands and use 95 or 98 RON fuel you are OK in Australia. You can get 91 non ethanol in many servos but you have to be careful as the 10% ethanol is often in the same pump . In saying that we still get bad fuel! We filled up last weekend and ended with 50 litres of bad fuel (diesel+E91 in a supposed 95 pump!) last weekend which killed my engine with in about 500metres from the dock! So now I have another major winter project - or a new motor - to be done by October.

[@Fireship1]

Ron Powell Wow Ron, sorry to hear about that. I guess the whole ethanol and water issue is more widespread than I thought. They do sell non ethanol fuel here in the US, but it's very hard to come buy. A search in my state (New Jersey) shows only two places to buy it in the entire state. (It's a big state here too!) And none of them are anywhere near me. Best I can do is try to burn the fuel in the tanks ASAP and not let it sit. I also dose it good with an ethanol fuel treatment with every fill up of the boat.

[@stanpatterson5033]

Love the "vintage film stock" that you used to take us back to show the one-way valve diaphragms. Don't worry about making "lame" videos, there's no danger of that happening. Oh, and as for giving your viewers the shirt off your back, that's wonderful of course, but if it goes any further than shirts, it might become a problem. Thumbs up !

[@DangarMarine]

Thanks Stan, sometimes videos don't quite go to plan but because I'm always doing them at the last minute my options are either to just put it out as is, or not have something for that weekend. One day I'll find a way to make the time to do them much earlier and do a bit more research first!

[@troyjacka598]

was awsome love this site got all my gears now happy as larry lol cheers m8

[@DangarMarine]

Hey Troy, glad to hear you've got all your gears sorted out.

[@donmoore4259]

Just wanted to say thanks for your taking the time out, in making your videos. Great stuff! We all enjoy them, and are so helpful... I'd like to request, when you find the time.. Will you make some more videos, covering motor Bogging...Why?? Is it in relation to Fuel pump, or in the carbs? Mainly, just more videos on Fuel Pumps, and Carbs... Thanks again, Don.

[@PhonEGeniu]

great video!

[@DangarMarine]

Thanks mate. :)

[@danidimesss]

Hey Danger! Your videos are always my first choice when marine work is needed so I have a question. I have a 2013 yamaha fxca 250 and recently on the water was having fuel pump issues. (Engine dying completely as if starved of fuel and primer bulb being the short term solution) Got it home and investigated the low pressure fuel pump which is electronic and absolutely no fuel coming out of the line which should be feeding into the VST. Went to the fuse box and found the fuse was blown. switched it out and fuel pump worked for a short time then nothing. Fuse blew again. Tried bigger fuses and they all have blown. Is my pump shot or is something else causing the fuses to blow? Thanks for all the great teaching!!!!

[@hkm_865]

Felt like Dangar today, did a powerhead swap on my Johnson 115. The VRO pump makes me nervous though

[@DangarMarine]

Nice work. With the VRO pump just make sure you start up with premix oil until you are sure that the oil in the reservoir is being consumed.

[@pandonia77]

Can you do a video that shows what are the most important or crucial tools/gadgets/testers to own when a noobie is considering to maintain and service their own outboards?

[@DangarMarine]

Sure, that's a great idea. I'll try to get to that one soon. :)

[@newyota1]

Good video.I thought maybe you would be showing a fuel pressure gauge installed in-line to show actual pressure it was producing.I just acquired a fuel pressure gauge to install between pump and carb. on my 85' Johnson two stroke to test.

[@DangarMarine]

I used the fuel pressure gauge in the original video that fuel pump came from, but unfortunately the boat this goes on is no longer hear so I can't test it directly. It is a good point about testing one in the future though. I'm normally only interested in fuel pressure with EFI motors but it would something worth checking for carburettors too.

[@t-rexvlogs5589]

Hey matte great watch just wonder the low pressure fuel pump to replace instead off rebuilding I thought you mentioned the price was reasonable was quoted $800 -$600 today

[@donmoore4259]

First, thank you for taking the time to put together these very informative videos...Now, question about fuel pumps.. I'm having an issue with an 1987 Johnson 90hp v4, which I just purchased and have it on the water several times no problems.. But, now it boggs down, doesn't die, just boggs down.. seems to happen once you try an open it all the way.. Things I've covered so far...One, I changed out the primer bulb, and switched over to a different tank of fuel.. So what next?? thanks Don..

[@DangarMarine]

I would make sure the carb bowls are full of fuel by draining one straight after it happens. If they aren't it could be a dodgy fuel pump. If they are full it could be a problem with blocked main jets meaning the carburettors will need a clean and perhaps the float levels set.

[@guyzoun]

2002 honda bf40. Original fuel pump. Is it possible that engine oil makes it way via the pump plunger/camshaft inside the pump? I noticed very little weeping of oil underside the pump assembly/gasket. Does not smell gas. Excellent video! Thank You

[@alfalfatheboss8317]

good vid

[@DangarMarine]

Thanks you!

[@mattfrapple7911]

How good was that black and white valve video cut in!

[@DangarMarine]

Thanks Matt!

[@geraldolmstead1335]

very good presentation I go by Jake I'm 73 and in poor health but I enjoy watching your presentations. One question, we have an old Johnson 40 hp. with the oil being mixed by an injection method,do you have a video showing how to rebuild the dual carbs if you do please let me know thank you.

[@DangarMarine]

Hi Jake, I don't have one specifically on those carbs, but other videos on cleaning carbs and installing carb kits that you may have seen. By dual carbs, do you mean that each unit is feeding two cylinders? I've got some carbs like that from an old V6 that had 3 dual carbs on it. I could do a video on that carb if I can find it.

[@jimbogasoline8559]

Hey stu! I know you get a lot of request for vids. I have a request that im sure most would like to see. When you google reading a spark plug, the info is vague and hard to tell. A quick tip on spark plug color reading would be great and a lifesaver. Could save someone from a piston rebuild by reading plugs. I myself just know dark is oil and white is lean. Thanks and please keep up the great work!

[@DangarMarine]

Good idea, reading spark plugs is an important thing to learn about. I'll start keeping interesting spark plugs in a tray somewhere and when I have enough of them I'll do the vid.

[@mattdevries7540]

Dangar Marine I have a 1966 Evinrude 5 hp, recently replaced a leaking fuel pump, connected everything and it fired up but it won't stay running more than 5 seconds, cleaned the carburetor the previous winter and also replaced spark plugs...any ideas on what the problem is?

[@jimbogasoline8559]

That sounds fuel related. Try choking right before it kills and see if it keeps running. it could be something else but i would start there. Mine did very similar after i rebuilt my fuel pump and all fuel lines and carbs. I just KNEW it was electrical. I bought an extra fuel connector and ran fresh fuel on a different tank. My problem was i was sold water as fuel from a marina. Since i just bought the fuel it didnt even cross my mind. Pulled my fuel/water seperator and it was FULL with water! Fresh non-ethanol fuel my ass! The marina screwed me. So try fresh fuel this time. Or dump some of your fuel in a glass jar and see if it has water in it. Let it sit for a lil bit and you will see the seperation if it is bad. Hope this helps and good luck

[@mattdevries7540]

bigfat hotdog it will stay running for a few longer seconds on full choke but still dies... just put new fuel mix in a week ago... could the carb have gotten gummed up only 4 months or so after a good cleaning?

[@mattdevries7540]

bigfat hotdog also it only starts using starting fluid but once that's gone it dies immediately

[@jimmyflynn1764]

hi stu i have the honda bf90 and got the shock of my life because as always every time i use my boat in the sea i get home and next day flush engine properly. well the last time i used my boat i took my top cover off engine and to my shock at the side of my thermostat there is a metal covering with a hose attached well it was all corroded at to buy new metal cover i would be happy if you could show on your videos where the water system flows so that i might be able to watch for any more problems by the way i have the full honda bf 90 diagram pages if you would like me to sent a copy to you i will do so but watching your videos are much more informative

[@DangarMarine]

Hi Jimmy, I've been meaning to do a video on the full path of the cooling water for AGES! Thanks for the prompt to bump it up the list. Stay tuned!

[@rob.halpin]

Thanks for this. I have that very fuel pump, bu my problem is that there's no water flowing through it. Can't figure out how the cooling channels are set up in that pump. Have tried vinegar and poking with wire, but no luck. Any advice for me at all? Thanks for all you do here, chief. SOLVED: So I found a solution to the problem. It is a fairly straight shot through to the tell tale hose. It is pretty narrow though, and with age, it gets a little jagged in there, which can catch a lot of sand and shell debris. I used penetrating oil and various size zip ties to "saw" my way through. Required much more physical effort than clearing hose or tell tale, so don't be afraid to lean into it. Hope this helps someone else.

[@ericturostowski6462]

Super

[@DangarMarine]

Thanks!

[@cree-rez67JB]

LoL.. good one about the t-shirt

[@bqpharm]

You wanna check the clock battery behind you, bud, looks shot! Great videos though.

[@stephancordell697]

mine squirts out fine on the boat from the outlet...I cleaned the VSP VST was wondering if carb cleaner is ok to flush through it or will it eat the rubber???

[@alpoktemornek7833]

Thanks for the video, my suzuki df30a year 2019 cuts power over 4000 rpm after 5-10 minutes ride. It starts and runs very smooth and perfect. Can you give any idea; is it the low or high pressure pump?

[@bfflorida2311]

You vids are 👍👍👍

[@DangarMarine]

Thanks mate. :)

[@pitsmcgoo]

Mine bogs down at full throttle. Occasionally when it's running fine it just runs out of gas and quits quite disturbing when you're running across the lake at full throttle. An old Mercury pretty sure it needs fuel pump rebuild. I'll take it apart tomorrow and see what I find.

[@DangarMarine]

Sounds like it could be a candidate. Good luck!

[@pitsmcgoo]

I took apart the fuel pump and noticed some fuel on the exhaust side of the diaphragm also noticed unburned fuel was coming out of the exhaust. The diaphragm itself looked good but obviously it was allowing fuel to pass in the wrong direction. Replaced the diaphragm and took it out to the lake for a test. Had full throttle again and actually had a couple of hundred more rpm The rebuild kit was only $8 on ebay so I saved a bundle over taking it to my mechanic who is very good but also very expensive . Very simple fix.Your video gave me confidence to tackle the problem thanks.

[@joshturner299]

My outboard is doing the same thing I have a gas filter between my tank and motor seems to be when it's full with just a small air bouble runs fine other then that I have to keep priming the ball when I'm full throttle

[@coreyblanchard5177]

So you should not be able to suck air from inlet or blow air through outlet, right?

[@guebsiali8875]

Hi What caused the fuel pump to fail? Because in the span of 6 months, he changed three times, and I don't know why

[@camping56]

Hi the vidoe is a big help im struggling to find the one way valves for my 4 stroke engine where did you get your from please?

[@andrew7202]

Where did you get the diaphragm from for merc pump also do you know where to get the bottom plunger assembly

[@bobparker270]

I have a 30hp Mariner EFI about 4 years old. It runs fine from cold. If I stop the engine after approx 2 hours and leave for approx 1 hour it will not start. It turns over fine but will not start. If I leave the engine overnight it will start up again just fine. Any ideas? Fuel is always filtered into tank and a fuel/water separator is fitted. Engine is serviced annually. I have enjoyed your blogs over the years and have begun searching through them again to help find a solution to the above problem. Cheers.

[@anthonybehr350]

Excellent video! Can anybody tell me if there’s a gasket between the head and the plastic back of the pump?

[@timven8402]

Just happened to see this great vid. I have -04 BF50A and the oil is getting thin and it smells like there's gas in it. How common is it that gas leaks through pusher rod opening? Can the gasket and rod be changed without buying the whole pump? This may be also a thermostat problem since here in Finland we have pretty cold sea at spring and autumn...and practically always if comparing to Australia😊

[@stanpatterson5033]

I have a question concerning the "problem" of the pump you rebuilt not being perfect (according to the pressure test) after your work..... What if you had wet or dampened the pump with some gasoline prior to the after-rebuild test ? Would things not have been happier inside the pump if the new valves had some liquid at least passed over them prior to being pressure (or vacuum) tested? After all, they do deal with liquids, not air. I do agree that it's good to test on the bench rather than out on the water, but just wondered if the test was completely fair to the newly installed parts.

[@ronpowell2373]

Stan, you beat me by a few minutes. I agree that those valves should be 'lubricated' for the tests as they are not air tight, in fact they are not even fluid tight. They don't actually have to seal , just be very restrictive to reverse fluid flow as they are being pulsed very quickly . That pulse speed means that fuel cannot reverse flow easily . On the KT100 go karts ( carb and fuel pump in one unit!) you need to put a squirt of WD40 on to the needle seat and on the one way valves to be able to set them up correctly. I use WD40 as some other cleaning fluids are not nice to nylon / plastic parts. The alternative is two stroke oil diluted 50:50 with kerosene, not petrol ( it evaporates too quickly and is too flammable for bench testing stuff)

[@DangarMarine]

Out of interest I'll squirt a bit of fluid in there and see how it changes. I think the test is useful enough just to know that the case has sealed properly (certainly saved me this time!), but if it was possible to get a better indication of the health of the valves it would be good. I think the trouble is, that as you both say, they will never hold air pressure fully so drawing a line between serviceable and needing replacement would be tricky.

[@ronpowell2373]

I just tried this on my spare two stroke fuel pump and it worked OK. Using an old 12volt tyre pump ( a K-mart one the kids use to pump up balls and bike tyres) I connected it to the fuel pump pulse line via a T piece. The open end of the T piece went off to a ball inflation spike that acts as a restrictor and to allow the pumped air to escape so I didn't over pressurise the fuel pump. The tyre pump pulses are enough to operate the fuel pump. The fuel out line was connected to a measuring jar, the fuel in line to my boat fuel tank . With the air pump running for 1 minute I measure just under 300mL of fuel delivered- which is more than enough for my 50hp engine. So if you have an old 12volt air pump around (probably even one with worn out one way valves would do, or take them out- then you can just connect it to the fuel pump directly) you have a great test unit !

[@inthenameofmyfather3836]

hi i was wondering if that plunger in the back could leak oil into the fuel ive got a lot of smoke like its burning a lot of oil 4 stroke 40 merc thanks

[@ahunterstail1083]

My son has a 4 stroke 9.9 hp evinrude, 1999 model, fuel pump isn't working and you can't get a spare pump, it the one with the rod that works the diaphram, any ideas please

[@brianwitosky757]

How many fuel pumps does a BF90A Honda outboard carbureted have

[@am44_67]

What’s the first thing you would check in this scenario, boat runs great except for at full speed RPMs drop and rise until I slow down a bit?

[@dangnomen]

thank you! im struggeling with my boat, a mercury 90hp 4 stroke 4carb engine, on full throttle it wont go full rpm.. i opened my fuel pumps (1 pump serving 2 carbs) and found the "sealant gasget"? full of some white powder, tho i cant seem to find a leak, tho there was some sandlike sort of grainy stuff in the chambers, so i cleaned them out, hoping it was the sinner, maybe blocking some valves or something... and i dont want that stuff in my carbs. cant seem to get my membrane off tho, but i cant see any damage... i see some fuel getting into the water but i cannot find where it comes from... its an 2001 model.. do u have any ideas?

[@benphilippi9325]

Your clock needs more batterias :)

[@ronpowell2373]

The clock is an on going comment generator :-)

[@mrleeal]

time stands still at dangar marine

[@DangarMarine]

I keep thinking, "I'll change that battery in ten minutes time..." ;)

[@Bluenoser613]

Seriously... I notice this every time. It's killing the OCD in me.

[@Fireship1]

Ron Powell yes it is! Lol

[@chugs]

Love your videos Stu, so Briiliantly simplified for lamen like myself.. My mariner 40hp efi has been beeping a continuous warning beep.. Apparently oil pressure, or overheat. I've replaced oil, oil filter, cleaned high pressure pump, replaced both fuel filters and bought all new fuel lines... Still getting the dreaded beep.. I'm going to replace this low pressure pump now as the cooling water runs through it so hoping it might help? Any other suggestions would be amazing..?

[@mg7601]

Where did you buy the low pressure fuel pump diaphragm kit at? I can't find any for sale. New subscriber here, great content!

[@leogaskell3138]

Does anyone know where to order the rebuild kit or even just the little valves and rubber pins from?

[@toddthemitchell]

can you tell me which fuel pump repair kit you used? I need to replace those reed valves in mine and cant find a rebuild kit. thx

[@phungkien2141]

hi mate, I have motor BF50A that has problem with the fuel pump. But I cannot find where I can buy the rubber. Could you help to show me where should I get it?

[@rickbest7361]

I need to know how to disassemble the cam shaft button that pushes on the diaphram! Thats all thats bad on my engine.

[@troyjacka598]

im now in middle of fixing my power tilt trim

[@DangarMarine]

Good luck!

[@kenspeich3684]

I have 60hp Merc, would a high pressure or low pressure fuel pump cause motor to not ramp up past 4000rpm?

[@MM-zb1uj]

Hi Stu. I have a problem the engine Flood`s on all 4 Carbs, when turning the Key on?? I have sat pressure on each, carb on my work bench, and nothing comes out of the intake? But when it is put on the engine it Flow`s out??? Could the pressure on the pump be too high?? It is a Mercury 50 hp 4 stroke 4 cyl from 2001 ( not the EFI model).... Enjoy your Videos.. Hope you can help mee. Sincerely Mogens Madsen from Denmark Europe..... Have a good day.

[@HigherPraiseQuartet]

I have replaced my low psi fuel pump and still have no fuel in the water separater. What do you recommend?

[@ianmcnab9124]

Can you please upload a vídeo on the suzuki df20ar high pressure pump how to clean replace parts of above pump

[@jasonwalsch5559]

You are awesome, One of the best Channels on KZbin for boating. Could the fuel pump being old /weak cause a weak jet from my carburetor/ not enough fuel?

[@DangarMarine]

Yes, if the fuel supply isn't high enough the level in the carburettor float bowl will be too low and the mixture will be lean. It could be a carburettor problem too though.

[@TheRandomviolator]

Dangar Marine, Thanks , I rebuilt the fuel pump. Think I've got it sorted out , still some adjustments to do. But I think it's time to replace the tachometer

[@user-qj2wp7xg4z]

Hey Dangar Stu, what's the best place to or these parts from in Sydney or online? I got the 2stroke fuel pump . Tohatsu

[@11bayrat]

Yes water comes out and I don't want to over heat it.ill put A hose disconnect on it Thanks

[@mulespur4806]

That rubber is to tight in side them one-way disk if drilled them out for movement it will seal as they are wrong for this pump will not move to seal. They should be a little bit lose so can work. Just my thoughts could be wrong

[@dustinabercrombie8939]

My 06 mercury 4 stroke efi is losing prime on warm starts. Could this be a possible issue or does it sound like high pressure vst? I've replaced primer bulb and main fuel line but problem seems to be getting worse. It takes about 10 attempts to start but once it cranks the engine runs fine.

[@garyr9823]

Thank you for video! What part number gasket kit for fuel pump?

[@mgav1975]

Thanks for the video. I am trying to convert my VRO on 1996 Johnson 200hp 90 degree to a premix conventional direct fuel pump. I was going to run 2 aftermarket fuel pumps in series and cap the extra pulse port- will this work?

[@WBU319]

We are working with this exact pump and encountered a problem getting one of the mounting bolts to thread when we put it back together. We backed all four out carefully just one time and three went back in well while the other won’t latch onto the female threading. Do you have a recommendation for how to correct this so that the pump can be fully reassembled? There is no visible issue with the bolt and so I figure that the problem is inside. We did switch bolts and found that any one of them works in the three good female threaded parts.

[@nicoletommy3261]

Would want to know why the engine gets bad real quick and our motor is Yamaha 40hp 4 stroke. I would want to know why our engine get warm. I was wondering if the oil is not working well

[@watsoncali25]

Could the bad valves cause fuel to get into the oil

[@DLuxProdbeatz]

i have a yamaha f115 with a similar pump. i opened it up because im getting fuel in the oil. the diaphragm has oil on the fuel side is that normal?

[@davidnieuwland]

The downside of a Yamaha pump ( below 100Hp give or take because the bigger engines have a different type of fuel pump ) is that the fuel nipples are plastic instead of metal. I have knocked off one of the nipples and it came off easily just a light bump. That mistake has cost me 140€ / 160$US for a new pump when it was working just fine. Be carefull taking off the fuel lines and pull gently. Just wish they were metal.

[@DangarMarine]

Ah yes, had the same problem a while ago kzbin.info/www/bejne/fZLdf4FpgJtoqrs

[@davidnieuwland]

I know, seen that video already Stu just tought I'de mention it for people who didn't. Your video's are great and have helped me a lot. Very informative , well explained and your jokes crack me up. Keep 'em coming. Regards.

[@taylorcole19]

I can't find the kit for this I need the exact black rubber plugs but I'm not sure on the size

[@ryanschreck9722]

I have 2 of the pump at 11:17, Yamaha. When I squeeze the fuel bulb, fuel leaks out into one of the holes where the mounting bolts go. That’s very bad right? I’m surprised that both of the pumps I have do the exact same thing.

[@DangarMarine]

Could be a couple of things. Either the diaphram / gasket in the pumps are bad or the needle and seat in the carburettor isn't sealing and the crankcase is filling with fuel through the throat of the carburettor. I would take one of the fuel pumps apart first and carefully look for tears, holes or pinched sections.

[@d.johnson499]

Great video on the fuel pump. I wish we had a guy like you here in the Atlanta area, someone who tinkers with older motors. My 1986 model Mercury 75 HP would generate a lot of work from you! As it is, I have to do it with a book and helpful videos like this. Question about fuel pumps: yesterday I serviced mine, trying to track down a fuel problem that is giving me some stalls and bad hole shots. The rebuild kit I got included a plastic 'cap' that fits over the end of the spring that contacts the diaphragm. My pump did not have that plastic cap, nor did I even know such a thing existed, because I always bought just new diaphragms, gaskets and check valves separately for pump service, never in a proper, everything-included kit. Because I never had that plastic cap, the end of the spring would always poking into the middle of the diaphragm. Could that have been a cause of my weird fuel delivery symptoms? Here's a picture of the spring: i.imgur.com/IcF3K9A.jpg and this is the plastic cap: i.imgur.com/5yeWJRH.jpg

[@DangarMarine]

Hi mate, can't say I've seen that exact fuel pump so I'd hate to give you the wrong information but it makes sense that something should be there to protect the diaphragm. Something else to be aware of though is that sometimes these kits come with parts to cover a range of outboards and not all parts are needed for your exact model.

[@johnhanna6637]

I have a 50 horsepower blue band it lay in a shed for 20 years I cleaned carbs new plugs it never had and tork 3 people and the boat wouldn't plane it ticks over its on all cylinders I sold it and the guy can't get his boat to plane the engine has low hours on it as it was hardly used I cleaned behind the coils to could it be the fuel pump

[@tomharnish9738]

what about the nocking sound coming from it sounds like worn cam or shaft ??

[@TheJstringer]

what kind of pressure gauge pump is that at the 10 min 30 sec mark?? great video as always

[@DangarMarine]

This one I presume kzbin.info/www/bejne/op_Li3mkasyefZY

[@S.Womack346]

i would like to get some help from you. how do i get ahold of you? i would like to send you a picture of my motor and ask you some questions. i can't explain what im talking about because i dont know what the parts are called. i know your busy but i thought it worth a shot...

[@DangarMarine]

Hi Shane. The best thing to do is upload images to Imgur.com or something similar and post a link to the picture along with your question on the most relevant video. That way others contribute as well as the solution being able to help others with a similar problem.

[@patrickfountain198]

Hey mate, thanks for all the videos, been super helpful when servicing my boat. Quick question - I have a 50hp Mercury (same fuel pump as you've used in this video). Above ~60% throttle it's losing power and sowly surges back to idle then cuts out. Switch it off and on and it's good again up to the 60% mark. Thinking it's the fuel pump or blocked injectors. Any ideas?

[@DangarMarine]

Sounds more like a fuel pump problem.

[@josecarlosgamez3718]

I got a 1986 bayliner 125 outboard motor, starts with no problen but when i acelerate to go fast ,the power go off and on off and on , what it can be , the carbs, or fuel pump? Or someting else?