Honda BF75D/BF90D Fuel System Troubleshooting and Maintenance

[@ScottColvin-d3s]

Great rundown. I've been doing Yamahas for 4 years, and now adding Honda into the mix. You made it easy to dive in. Thanks!

[@davecavanaugh66]

Awesome- glad to help. Thinking about repowering up to a Yamaha 115 at some point in the future. Weight is about the same.

[@RickCollinsNL]

Thanks. This helped. Big difference was you showed the effect on the motor and it was exactly happening like mine but at higher revs. Swapped filter and checked tanks and hose. Works great now.

[@davecavanaugh66]

Glad it helped

[@MikeTLive]

this is an awesome straight forward explanation from start to finish diagnosing and repairing your issues. love it.

[@davecavanaugh66]

Glad to help 😁

[@abelrodrigues5051]

This Guy spoke very calm and understandable as far as doing your own servicing. I truly enjoyed watching and learning from his video. Please continue making servicing video's on those Honda's, and I'll continue watching and learning from you. Thank You

[@davecavanaugh66]

Thanks Abel - glad to help.

[@stevebehrens6193]

well done. I have the confidence to handle a similar problem with my 2004 150 honda

[@davecavanaugh66]

Glad it helped

[@kenmazza1766]

Wow great video thank you for you insight. Will add this to my maintenance schedule. Thank you again

[@davecavanaugh66]

Glad it was helpful!

[@richroberts8238]

Absolutely great job with this video for any if us with the Honda 90. I thought I had a good idea about fuel system and what I actually had was half an idea and now far better understanding. I started at tank and all hose connections and now looking at filters. So thanks for a thorough job.

[@davecavanaugh66]

Glad to help 😁

[@brian1919]

Great video. I just bought a Whaler with the Tohatsu BFT75A. My first 4-Stroke. We have no Rec fuel in NY and I just cleaned my tank etc lots of water. You gave me a complete bullet list of work through items. Low hour engines are the worst. Thanks again.

[@davecavanaugh66]

Glad it helped

[@brettbw1]

Dave!!! I just changed my low and hi pressure fuel filters on my 75D. I know it's a little thing but i feel good about being able to do some routine maintenance. Thanks again. You 100% helped and inspired me

[@davecavanaugh66]

Absolutely- glad to help!

[@privatejoe4029]

Thank you tons for posting this Dave, I am having similar symptoms and this video was enormously helpful in understanding the entire fuel system !! Very well done video as well !!

[@davecavanaugh66]

Glad it helped 😁

[@shuswapoutdoors]

Had this exact problem with my 2018 50hp. Had to change all 3 fuel filters and changed the fuel line too. Wish I found this video 3 weeks ago. Thanks

[@davecavanaugh66]

Glad it helped

[@NonTypicalRacing]

Thank you dude. 2014BF90 runs horrible, I know what to look for....now.

[@davecavanaugh66]

Glad to help

[@karelh186]

I also noted a problem today with my bf90😢 it does not reach full power anymore like it was in earlyer days , I think the e10 (ethanol) fuel we have in Europe caused these problems. I think i will clean it all up like you did,a handy video for it.

[@davecavanaugh66]

Yeah ethanol based fuel is horrible on these motors especially if the are sitting.

[@bretburt7317]

Thank you. You gained a subscriber because this was explained so well. Simple step by step.

[@davecavanaugh66]

Thanks - glad to help!

[@linoveiga]

I have done all this and took system apart yesterday again because the day before it ran good for about 20 minutes then it acted up, I'm not sure mine is fuel related as much as I think it is, because after sitting cooling then it will run WOT without problem. Sucks fixing this because I have no way to run it under load at home, the only thing that comes to mind, is the electric fuel pump overheats and turns off, but if this happens I'm not sure if the outboard will run with only low pressure pump pushing fuel past high pressure pump, I guess I can disconnect power to it to check this.

[@davecavanaugh66]

Sounds to me like clogging in the VsT and/or a high pressure fuel pump issue.

[@jerrynelson4015]

Great video Dave. Just replaced a 45 Honda with a new 90 on our pontoon. Your video has given me a lot of confidence to be able to complete my own maintenance. The manual states to "release the drain tube from the projection of the Intake manifold..." however I'm not sure where to locate that. Thanks again!

[@davecavanaugh66]

Hey Jerry - What type of maintenance are you trying to do - are you trying to drain fuel from something on the motor? Also what type of manual are you using - is it the owners manual?

[@BegoneJonah]

Great video! I have the same issue with my BF75D - it looks like the same setup as your 90 HP engine. I'm about to tear into that spring-loaded strainer and the VST. Whew! That high pressure pump motor is over $300 and the injectors are $77 each. This could get expensive.

[@davecavanaugh66]

Yes - the 75s and 90s are essentially the same motors. And yes boats are expensive, but just think how much you are saving doing it yourself 😁.

[@BegoneJonah]

@@davecavanaugh66 Let me get this right: If the fuel strainer is cruddy it's because the pump and VST have crud in them? In other words the fuel flow is such that the strainer is the last stop before the injectors?

[@davecavanaugh66]

@@BegoneJonah - yes in my experience if the HP fuel filter is dirty, then I would definitely look upstream for other issues.

[@BegoneJonah]

@@davecavanaugh66 ...and you have to remove the lower plastic half of the cover, to get the VST out, right?

[@davecavanaugh66]

@@BegoneJonah yes you have to remove the cowlings. I have another video that shows how to do that.

[@DanielDeLoach]

Awesome Video. Enough to get me started troubleshooting my fuel system. Thank You

[@davecavanaugh66]

Glad to help 😁

[@jgant56]

Awesome explanation, probably just told me what’s wrong with my BF90. Appreciate your video!

[@davecavanaugh66]

Glad it helped!

[@justinjordan2128]

Dave, thanks for this video. Helped me immensely and you do a great job of explaining 👍

[@davecavanaugh66]

Awesome - glad it helped 😁

[@rastis20091]

I suspected a filter in the high pressure filter canister you pointed out. My Honda dealer assured me the was only the one. The low pressure filter. I don’t know squat about outboards. Apparently they don’t either.

[@davecavanaugh66]

Yeah not everyone knows there are 2 filters

[@cristinadaniel9550]

Dave I have the exact issues with the same motor, Fighting temp then fuel now temp again. Did pretty much the same as the video with fule be didn't open VST. Do get some discolored fuel from rail line. Seems the VST may have gunk.

[@davecavanaugh66]

Might be two separate issues if you’re having temp and fuel issues. Check out my other video for troubleshooting the cooling system. As far as the fuel issues, make sure to check/change out all the basic stuff first before digging into the VST. And don’t change your fuel injectors until after you are certain your VST is clean otherwise you will clog up your new injectors.

[@ingmarzz]

Awesome video Dave! Trying to get the error codes out of my 2016 EFI BF 50, -tried a few things but to no avail. Seems to run well but the buzzer goes off after 10 min. I've changed the thermostat and sensor, but didn't stop the buzzer...Any ideas?

[@davecavanaugh66]

Is this motor new to you or have you had it for a while? Other than the buzzer, are there any indicator lights? Does it overheat?

[@ingmarzz]

Hi Dave, thanks so much for your reply! We got the motor lightly used about 3 years ago. Everything seems to be running good, lots of tell-tale, oil's good etc. I replaced the thermostat and the temp sensor thinking that was the problem, but no cigar.. I've tried all the regular methods for pulling the codes, -shorting out the red plug etc. but that doesn't seem to work... We totally depend on our boats up here on the wild and remote BC Central Coast, -we have water access only to our house.. @@davecavanaugh66

[@richroberts8238]

Ok, checked operation of low pressure pump, simple diaphragm off engine, changed low pressure fuel filter, based on high pressure fuel filter change got in cleaned out VST and replaced hp fuel pump. All crap from sitting too long. Replaced all fi after finding at least one froze. 12 v would do nothing. Still no fuel to injectors. Thought initially connectors to hp pump problem so pulled and double checked. Tomorrow will back up and start pulling more hoses to find why no fuel flow. I will figure it out but what a pita. Was fresh gas but now about a month on testing and tearing apart or getting parts so….any fresh ideas? I mean I literally did everything you did step by step. Not sparkplugs though. Should be good. But no fuel at rail is key. Precision Fuel Injectors had exact match Kehein injectors for 190 bucks delivered 4 of them. Perfect lifetime warrantee. The Injector Shop had rebuild kit 4 injectors less than 20 bucks. Getting that inlet filter out a pita. But got it eventually. So maybe keep old ones as spares maybe.

[@davecavanaugh66]

If no fuel is getting fuel to the rail? Then work backwards.

[@RFT2112]

Hey Dave. Super helpful videos. Mine is doing the same thing. Intermittent idle problems. Only difference is mine is a 2004 carb Bf90A. Had the carbs cleaned. Seemed to help but it’s not 100%. I bought a service manual and will take a closer look. The Honda dealer said it runs fine.

[@davecavanaugh66]

Hey Ron - yeah sorry I can’t help with the carb motors. If you’ve eliminated everything on the boat side (tank, hoses, connectors, filter, gas type) then I would definitely say it’s something on the motor. Does it run rough at higher speeds or just idle? The tough part is, fuel issues often doesn’t produce codes to point where the problem is. So if your current shop is just looking for codes, then they might miss some things. Might want to get a second opinion from another shop - I learned this lesson the long hard way 😬.

[@jatrogers1]

Thank you Dave! Very helpful in my troubleshooting

[@davecavanaugh66]

Glad to help

[@MarneyMcKenney]

Hi..great video...thanks. The clip that shows the test of the HP pump with the hose disconnected at the fuel rail. Is that after you cleaned the VST and replaced the HP pump, or before as part of the troubleshooting. I dont get nearly that much pressure/spray when doing the same test., so was wondering if the HP pump/VST was the next step. Also, how much flow do you get when doing the LP pump test? is it a steady flow similar to when you squeeze the bulb, or much less? My LP pump (during the hose disconnected test) puts out much less then when squeezing the bulb to prime the system. Thanks again!

[@MarneyMcKenney]

Also, I've already replaced the HP and LP filter, and cleaned the water seperator.

[@davecavanaugh66]

Tests were performed after replacing both pumps and filters. The LP pump flows as you turn the motor over. Its job is to simply deliver fuel to the VST. The HP pumps job is to deliver fuel in the VST to the injector rail. It should deliver a strong 2 second pump when you turn the key to the first position.

[@MarneyMcKenney]

@@davecavanaugh66 Thanks! its delivering a weak 2 second pump, much weaker than what your video shows. THe LP pump also delivers a pretty weak flow as I turn the engine over with the hose disconnected at the inlet to the VST.

[@davecavanaugh66]

@@MarneyMcKenneyinteresting- might be having trouble sucking fuel from the tank. Have you tried disconnecting the fuel lines along the way and squeezing the bulb to figure out where there might be a choke/clog point? Also could be sucking air somewhere along the way.

[@JohnRodgers-xx4hx]

I have a 2016 bf-90 honda that has "always" had rec gas. This morning it started and ran for about 100 feet. It has water pumping out, green light on the controller for oil pressure. It will not fire at all now. Checked fuses and fuel bulb is got good resistance. Tried unplug plugin safety it is in nueyral rolls over full speed but will not start?

[@davecavanaugh66]

When you say it won’t start - does it beep twice when you turn the key? Do you get the 2 second pump from the High Pressure fuel pump? Does the motor turn over?

[@martinparker9249]

great video pal.....thanx from the UK !

[@davecavanaugh66]

Glad to help

[@rogerviets3150]

Dave, just subscribed after watching video. Yours are the best I’ve seen. I know this is a little untimely as your post was nearly a year ago. I have a aluminum v-hull with 2017 Honda 90. I purchased new with the boat. We put around 40 hours on the boat the first 2 yards but due to unforeseen circumstances, we were unable to use it the last couple of years. I have done all the recommended maintenance as prescribed by the owners manual ( oil and gear lube changes,etc) but am concerned about the gas in the tank. I did put a gas stabilizer and only use non ethanol gas. However, it has been sitting for two years. I did start it and it started right up but would like to remove as much of the remaining gas from the tank. The tank is built in and must have a screen on the filler tube because I can’t get a siphon hose in there. Also tried siphoning from the rubber bulb but would not work. I think because it has to flow through an external fuel filter/water separator. Any suggestions without having to pull the deck to access the tank?

[@davecavanaugh66]

Hey Roger - well I can think of a few things. First option is to disconnect the hose before the external separator and siphon it out from there. Second option is to pump it out by hand with the bulb by disconnecting the low pressure hose after the LP fuel filter then connect a longer hose to dump fuel into and external gas can. Third option is to simply run it out with the motor. The fuel is probably fine if it’s non-ethanol with stabilizer. Fourth option is to have a marine shop do it for you. Good luck.

[@rogerviets3150]

Thanks Dave. Ended up disconnecting at the external water separator and was able to siphon off the gas. Thanks for the suggestion. I just have to figure out what to do with old gasoline.

[@richroberts8238]

So again great video. Hp fuel pump crap, hp fuel filter crap, VST ugly. All that now good. Guessing fuel injectors next. May try to clean first then if not solution replace.

[@davecavanaugh66]

Good deal. Yeah I tried cleaning my injectors, but I decided just to replace them considering all the mess in my VST and filter - just didn’t want to play the guessing game.

[@richroberts8238]

@@davecavanaugh66 may do the same. 80 bucks or so a piece. I have done major work on motorcycles and used to be a place that blueprinted injectors but likely cost more than buying new.

[@brianbuda5710]

Thank you for your videos. They are super helpful and very specific. Question for you, is your primary use in salt water?

[@davecavanaugh66]

Hey Brian - yes mostly salt water in Florida.

[@richroberts8238]

High pressure fuel pump looked like crap. So guessing VST next on list. As rust on high pressure fuel filter likely means fuel pump done so got any good sources for OEM parts?

[@davecavanaugh66]

All the parts are listed in the description section with link to boats.net

[@bcarss1970]

Hello Dave. I am little bit of an outboard newby. If there is a water separator on the motor, why have the pre-motor separator filter? If the pre-motor is doing its job, why would there be water or debris in the motor filter? Thanks Brad.

[@davecavanaugh66]

Good question - most onboard fuel/water separators provide filtration as well as separation capability. Of course you probably could get away with not having one, but my opinion is it’s a good practice. That said, I have seen lots of smaller portable motors 30hp and below don’t have them onboard.

[@bcarss1970]

@@davecavanaugh66 I just bought a pontoon with a 2006 BF50 and it has the onboard filter but I am ordering a Racor 120R-Rac-01 filter, couldn't hurt. Thanks Dave

[@Mrscottyboy4]

How did you re prime the fuel system? Squeezing the bulb? How long did it take? I fell like I can’t get the bulb to go hard now.

[@davecavanaugh66]

Yes the bulb should prime the system all the way to the VST. Once the VST is full, the float valve will close and stop the flow of fuel and your bulb should get hard. If your bulb is not getting hard then you have leak or air is in the line. The video shows how to bleed the line.

[@DeanHadfield]

Excellent video and ecxplanation. 👍🏻. Thank you

[@davecavanaugh66]

Glad to help

[@pierrecaron3062]

Yes great video it helped me

[@davecavanaugh66]

Glad it helped

[@davecavanaugh66]

Glad it helped

[@johnseele4464]

Fantastic video....well done!!!

[@davecavanaugh66]

Thanks - glad to help

[@stansronuc3934]

Hi Dave, thankyou for the Fuel system Troubleshooting and Maintenance video. I Have done everything you showed on my BF60A. I replaced the high pressure pump but still the boat did not start up. Can you advice?

[@davecavanaugh66]

Well that could be a ton of things. Why do you think it’s fuel related? Have you checked for spark?

[@stansronuc3934]

@@davecavanaugh66 There is no fuel discharged from the vst and HP pump.

[@davecavanaugh66]

@@stansronuc3934 the BF60A may be different than the BF75/90D, but I take it you pulled the injector rail hose and tried to see if you get a 2 second pump of fuel when you turn the ignition?

[@davecavanaugh66]

@@stansronuc3934 looking at the owners manual for BF60A and it looks like there is a 10 amp fuse for the HP fuel pump. Did you check that? cdn.powerequipment.honda.com/marine/pdf/manuals/00X31ZZ36100.pdf

[@stansronuc3934]

@@davecavanaugh66 Thanks Dave, I will check the fuse. Thank you for the link.

[@rs4912]

Thank you from Norway..My bf 50 starts to run very up and down suddenly, then i pull down engine idle to minimum for about 30 sek. And everything is normal for a while (5 minutts) then the same operation again. I have never change the hp filter if there is one. Doe you have any suggestion? Sorry my English Topp video👌👌 Rs

[@davecavanaugh66]

Interesting issue - could be several things. Does it only surge when you are under power? If so, what does the Tachometer read when it’s surging? Does it surge when you are at idle too?

[@rs4912]

@@davecavanaugh66 The problem is solved. I attached a clear tube to the float housing as suggested here. When the engine started to rev, I stopped it and opened the drain plug in the float housing. By then the floating house was almost empty. When I then started the engine at idle, the level rose slowly. At first thought it was the feed pump, but it turned out there was still air in the system after the water separator/filter was changed a few days ago. the conclusion is to get all the air out by pumping on the hand pump while the engine is running, until all the air is out.

[@davecavanaugh66]

@@rs4912 interesting- the VST does have a breather hose on the top that should allow air out. So I’m guessing your air in the line was on the low pressure side?

[@rs4912]

@@davecavanaugh66 That is correct. So there was no fault with components on the engine, only air was the problem. But anyway, a very good video you have made that you can follow the entire petrol system from tank to injection👍

[@davecavanaugh66]

@@rs4912 thanks - glad it helped 😁

[@brettbw1]

Dave, thanks again for the video. You've given me the confidence to do some basic maintenance. I pulled off the filter at the front and a hose came off from somewhere. Maybe a vapor hose? Looks like it terminates in a slot on the frame? In your video, the hose has pulled off too , i see. Thanks PS can you post the correct fuel filter numbers for a 75 D? Maybe you did already.

[@davecavanaugh66]

Hey Brett - the parts for 75 and the 90 are the same. All are listed in the video description area. Not sure exactly what filter or hose you are talking about (high pressure, low pressure, or water separator). Maybe you can tell me which part of the video I show that in (minutes).

[@brettbw1]

@@davecavanaugh66 thanks. The i saw the correct hose place in the video. It comes out as soon as the water water separator is pulled off. It tucks back in the frame at the very front of the motor.

[@brettbw1]

9:45 , there's a hose almost blocking removal of the filter

[@davecavanaugh66]

@@brettbw1 ah yes that’s just a vent hose.

[@tanja5261]

Thank you for your vids.🙏 I have exact same issue! With gear rounds go only for 4200. Change all fuel filters and took of VST. Pump was Ok. Two gasket was leaking. Change those but now rounds are still only 4300.. What can I do next? Sorry for my terrible english! Yes and the engine runs just fine otherwise and nothing alarms etc. And also when i have no gear on rounds go up to the end of meter!!

[@davecavanaugh66]

Are you saying the motor runs fine but will not go over 4300 RPM?

[@tanja5261]

@@davecavanaugh66 YES!!!

[@tanja5261]

@@davecavanaugh66 And the engine is Honda bf80A.

[@davecavanaugh66]

@@tanja5261 so not sure about a Honda BF80A but max RPM is generally about 6000 RPM. If you are running the motor in a bucket or on a hose, without the prop engaged, then that’s what you should see. If you are on the water with the motor in gear running wide open, then it could be your prop size that is causing RPMs to be low. There are lots of variables to consider when it comes to props. Watch my prop video.

[@tanja5261]

@@davecavanaugh66 Thank you for your answer! I have allready change my prop from Steel prop to aluminium prop. And it is a right size prop. Could it be somekind of electrical problem? Like a bad battery or wires. I'm getting out of options...

[@tommyorshall7890]

Hi Dave love your Videos. Trying to fix Fuel issues. Figured out it’s the high pressure fuel pump. Thinking about replacing all the filters. Can’t figure out the part numbers or where to buy from any help with this would be a very big help. Thank you. I have a 2007 90hp 4cyl

[@davecavanaugh66]

I have many of the part numbers listed on the video description area. I get most of my parts from www.boats.net/catalog/honda/outboard

[@virgilblanton]

Those gray fuel lines are junk. The liner in them gets hardened and starts breaking down then right into the motor. There are some videos about this issue. Good video!

[@davecavanaugh66]

Interesting - I haven’t had any issues with them - still flexible and no break down yet. I will keep an eye out in my filters.

[@virgilblanton]

All the info I have seen was from the use of ethanol fuel, I saw this in the fuel lines in my Hewes Craft so swapped them out. Great videos, thanks for your time and effort.

[@davecavanaugh66]

@@virgilblanton glad to help. Good point and that makes sense with ethanol based fuels breaking down hoses among other things. Yet another reason to stay away from it.

[@virgilblanton]

I totally agree about that fuel, but our current government is making non ethanol gas like 4.30 here in northern Idaho. And my boat tank is 40 gal, sad for sure! Take care Dave!

[@brettbw1]

Also checked water separator. All good

[@davecavanaugh66]

Good deal

[@tittuslennert198]

Nice & detailed description/explanation 👍 I have an Honda BF150 A. Last year i have an issue with the VST. The fuel was “leaking” out on the side of the transom just above waterline. It showed out to be that the bonding in the float it self had separated tiny but enough to be partially filled with fuel. Which resulted in that the float became too heavy to close the air vent “needle”. So the fuel was “vented” out via the air vent. I’m looking for maintenance manual/shop manual. Do you have any recommendations where to purchase it? Should I buy diagnostics tool? I live in Greenland 🇬🇱

[@davecavanaugh66]

Interesting issue - I order my parts off Boats.Net - I believe they ship overseas to certain countries. You should probably call them [phone]. As far as the diagnostic tool, having one is definitely handy but not 100% necessary. I use Healtech OBD-H01 Diagnostics Kit. You will need to also contact them to see where you can buy for your area.www.healtech-electronics.com/wheretobuy

[@tittuslennert198]

Dave Many thanks for your Quick respons👍😊

[@CNArea51]

Excellent Thanks Dave !

[@davecavanaugh66]

Glad it helped!

[@brettbw1]

Good stuff. How can i tell how many hours are on my motor? Also , I need to get valve lash checked. Closest Honda dealer us 1+ hours away. Can another dealership do it? Thanks

[@davecavanaugh66]

Hey Brett - I show what I use in this video. kzbin.info/www/bejne/rKK3iIeKepiUnZo

[@davecavanaugh66]

Yes - another dealer can do it.

[@srenhenriksen6369]

Super great video. Thanks a lot... 👌😁

[@davecavanaugh66]

Glad it helped!

[@giaotran7789]

I need your help please I have Honda 2010 outboard 60hp I have problems not running smooth because fuel system please let me know thank you

[@davecavanaugh66]

Not sure I can provide more help beyond what’s in the video.

[@randalkidd7562]

Hey , I need injecter for 2012 75, can you tell me parts number by chance ??? Thanks

[@davecavanaugh66]

All the part numbers for BF75D/BF90D are provided in the description area. Also show this in the video.

[@davecavanaugh66]

OEM Part Number: 16450-ZY9-003

[@randalkidd7562]

Would u know where I can order one off internet , and I thank you so much !!!

[@davecavanaugh66]

Boats.net

[@randalkidd7562]

Thanks alot !!!

[@russperkins6208]

Thanks Dave for your extremely helpful video. May i ask where you got the shop manual for the 2010 Honda BF75D - BF90D ?

[@davecavanaugh66]

Link to the manual and parts are in the description box

[@sambrink87]

Hi Dave, thanks fir the video =, when i try remove the HP pump from the housing its stuck, how did you get yours out?

[@davecavanaugh66]

Yeah it’s pretty snug in there because it has a plastic skirt around the pump, plus there is a nipple at the bottom. In my case I had a new one so I wasn’t worried about damaging it. Can’t remember for sure, but I think I grabbed it with some needle nose vice grips.

[@robertdickens6531]

Hello there. We have a 50 BfD and it runs then it stalls It beeps two time but then there are no lights blinking. It runes then stales out and after a few minuets it will start and run for a few minutes. put new spark plugs in and a fuel flitter in. can you help? Thanks.

[@davecavanaugh66]

So that’s a loaded question because it could be lots of things. My guess is it’s a fuel related problem. Did you eliminate all the basics such as good fuel, good fuel flow, good hoses, good bulb, clean filters, clean water separator, air vent on the tank? Is you motor fuel injected or carbs?

[@robertdickens6531]

@@davecavanaugh66 fuel injected. new plugs, new fuel filter. What is Bulb?

[@davecavanaugh66]

@@robertdickens6531 the fuel line bulb connected to the gas tank that you squeeze to manually pump gas into the motor. Sometimes the lines and the bulb valve cause issues restricting fuel. I show all this in the video. Is your fuel tank built in or portable tanks? Did you change both fuel filters - high and low pressure? Again, I show all this in the video.

[@saintsfan7991]

Wow, that is pure laziness on the part of your dealer, shame on them. It's a fairly basic/mechanical problem as opposed to trying to chase electrical gremilns or computer related stuff etc. Great job on your part in troubleshooting and fixing it. I would make a point to embarrass the dealer and make sure that I got a refund for any diagnostic charges they made. It really burns me when I see that sort of incompetence. It's not even really incompetence...just lack of effort and pride in their work. You see it all the time at car dealerships also. It's not like it was a warranty issue either and they just didn't want to mess with it....they could have made good money off of you on the proper repair. You should mention the name of the dealership so that others don't waste their time or money trying to have them service their motors. Shaming them might motivate them to get some good mechanics also. You should be proud of yourself for getting it solved.

[@davecavanaugh66]

Thanks for the feedback

[@ondrejmucha79]

Perfect explanation, thanks!

[@davecavanaugh66]

Glad it helped!

[@lmantell8367]

Do you have any idea why a new Honda BF75D won't go above 2000RPMS? Speed seems ok at full throttle of about 40 MPH, but it might get more. Can't figure out the low RPM problem.

[@davecavanaugh66]

I can think of several things, but first let’s start with the basics. Can you get the motor to rev up to 3-4k rpms when not in gear as a test to ensure the gauge is not bad?

[@johnnyvanover3572]

Dave .I've done all of the above what yr say and I'm still having problems lunding like it's starving for fuel .What else can I look for .

[@davecavanaugh66]

Of course I can’t double check your work, but still sounds like you have a fuel problem somewhere in the system. You will have to isolate it whether it’s on the boat side, or low pressure side, or high pressure side. It’s certainly not easy to figure out. You might have to replace several parts to get to the one that’s the issue.

[@johnnyvanover3572]

I put new high pressure fuel pump. Rotary fuel pump no plugs find injectors the new valve on the tank just wondering if it's more something electrical getting hot

[@johnnyvanover3572]

Sorry new plugs and cleaned the injectors

[@davecavanaugh66]

@@johnnyvanover3572 if you swapped out the low pressure fuel pump with a new one, just make sure the hoses are on properly for the inbound and outbound as shown in the video.

[@MarcoFonti]

With a pressure test with manometer highpressure side you could save a lot of time...

[@davecavanaugh66]

Didn’t have one and wouldn’t know what normal pressure is supposed to be. The shop that I took it to should have used one but obviously they didn’t know what they were doing. So I did the best I could with what I had. Just good old fashioned troubleshooting. Still would have had to clean the VST in the end and I learned a ton along the way, so I say that’s a win 😁.

[@MarcoFonti]

@@davecavanaugh66 for sure it's a win. I only say you could save time. But maybe with less fun. You have the shop manual, with is beautiful to read and in there you can find really everything. Have fun with your fantastic outboard.

[@trewebster426]

Awesome video$$$$$$. Bailed me out big time!!!!!

[@davecavanaugh66]

Glad it helped!

[@garymartin8316]

Dave we recently purchased a boat with a 2008 Bf90d like yours. Replaced the filters and high pressure fuel pump you mentioned. Also replaced the fuel line from the tank to a new separator and primer bulb. Still having a issue occasionally with surging than a stall. Once that happens the primer bulb will need to be primed again. Does that sound like the low pressure pump needs replacing or is failing? Thanks for any advice Gary

[@davecavanaugh66]

Hi Gary - Intermittent issues like that are hard to troubleshoot. Can you duplicate the issue when you are at home running on the hose? Next time that happens, first thing I would do is check the water separator bulb on the motor to see if it has fuel in it which might be an indicator that the LP fuel pump is having issues pulling fuel from the boat. If that’s the case, then it could be the LP pump or it could be an indicator that’s something on the boat side. My other thought is the VST float might be having an issue (sticking closed) which would cause the VST to dry up and not stay full. If you just had the HP fuel pump replaced, then something that may have gotten messed up in the repair. Was this issue happening before you had the HP fuel pump replaced? Also have you done testing on the LP and HP pumps like I showed in the video?

[@garymartin8316]

Sorry so long. Hey we didn't get a chance to run the boat prior to doing repair and maintenance. A little history to catch you up. It had sat for almost 2 years during the pandemic. When we purchased the boat had 410 hours if that is correct. Other than running for just a few minutes without a load. That was it. Due to sitting we wanted to clean out or replace the whole fuel system. That's how we got into the vst HP pump. It was similar to your HP pump. Very dirt. However the tank was clean. All the fuel line, primer bulb, filters, oil, impeller pump and spark plugs. Really any regular maintenance. We did it. We are unable to duplicate at the house on a hose. Never does it at idle. Only when we are running did we see the issue of not full primer bulb. Which led us to the LP pump. I did replace LP pump yesterday. It did not stall. Primer bulb stayed firm. Not saying that fixed the problem. Think it has to help. Our old LP pump was the original. The hoses had to be flipped. Being it hasn't totally failed. I think it was just a weak fuel flow from the tank. Where we are at now. We have noticed the rpm will not go above 3000 rpm. Read several opinions on different reasons and parts that may be failing. Fuel injectors, neutral safety switch and possibly running hot to name a few. Our boat is a 2008 Sea Fox 187 CC with a Bf90d. It will run 35 mph at full throttle with our family of 4. Does that sound normal? Is something keeping it from going above. Does your rpm go above 3000? I have a plug in code reader. That flashes the light. No codes are flashing. If I purchase Dr H would that tell me anything. Sorry its a lot of questions. Gary

[@davecavanaugh66]

@@garymartin8316 so are you saying you can run 35mph at 3000rpms? Has it always run like that or is this a new issue. To me it sounds like you have more than one issue.

[@garymartin8316]

@@davecavanaugh66 Since we have owned it always ran like this. . Top speed is 35mph at 3000 rpm. The PO told me his top speed was around 33 mph at 3000 rpm also. Could there be a rev limit? Guess tach could be sticking at 3000 rpm. What rpm does your motor read at top speed?

[@davecavanaugh66]

@@garymartin8316 that’s a prop thing. Check out my prop video. You should max out between 5000-6000 rpm to maximize performance.

[@bretty7923]

Great video

[@davecavanaugh66]

Thanks!

[@Drydock8]

Thank you !

[@davecavanaugh66]

Glad to help 😁

[@rsrs3128]

Great video!!!

[@davecavanaugh66]

Thank you!!

[@brettmoohouse1133]

man so helpful thankyou!

[@davecavanaugh66]

Glad it helped!

[@felicianonunez7216]

Where did you get that manual?

[@davecavanaugh66]

publications.powerequipment.honda.com/details/61ZY900E3-BUNDLE

[@otticamantovani9874]

thankyou

[@davecavanaugh66]

You're welcome!

[@Mohammed-cp3kv]

👍🏻👍🏻👍🏻👍🏻👍🏻

[@76whalen]

what size boat is that?

[@davecavanaugh66]

Triumph 1700 Skiff (closer to 18ft)

[@76whalen]

@@davecavanaugh66 I have a 87 Robalo 18 foot with that motor don’t seam big enough for mine

[@davecavanaugh66]

@@76whalen my boat weighs about 2800lbs with 2 men, fuel, gear, etc. On a good day, I get about 32mph top end speed at about 5300 rpm using a 4 blade stainless prop with a 13” diameter / 17” pitch. I also added smart trim tabs which helps lift the stern. It took a lot of trial and error (and money) to figure out how to maximize performance on my boat based on what I use it for which is mainly shallow water flats fishing in Florida. My point is there is a lot that goes into dialing in the right prop/trim setup depending on all the variables I mentioned above.

[@76whalen]

@@davecavanaugh66 mine will turn up about 7000rpms. With a 13” 15 pitch. Three blade. I just ordered me a four blade 13” 15 pitch. Hope it planes off quicker. And slow the rpm’s down a bit

[@davecavanaugh66]

@@76whalen yeah 7000 is way over. Book says 5300-6300 rpm. The 15 pitch put me at 6300 and the 17 pitch put me at 5300. There was really top end performance gain with the 15, so I elected to go with the 17.

[@fabriziobattellino4740]

I live in Italy, ...Sorry for my english, I have a problem with Honda BF90D year 2007, ...can you help me?...it's possible to contact you in some way.(e-mail) ..as you prefer...i could explain my problem. Tank you so much!

[@davecavanaugh66]

I’m not a marine mechanic, but I can’t try to assist. Please record what’s it’s doing and post a link here.

[@Fljeff7]

Great video

[@davecavanaugh66]

Thanks - glad to help!