Mercury 90hp ELPTO constant buzzing

Quick video to help you fix the constant buzzing on you Mercury boat engine, we was playing on lake and from nowhere it just start buzzing, I checked everything , motor was not overheating, there was oil , cooling worked ok ,so I took it apart and found the problem with low oil magnetic sensor , the magnet inside of the oil tank separated from the float and was telling the computer that there was no oil , quick fix and it’s back on water .

[@RollerSpeargun]

I have the 2003 125hp Mercury motor, The 90, 115 and 125hp motors all have the same oil tank for everyone's information. I would like to congratulate Treasure Adventure Hunter for his comprehensive video. I was particularly interested in the fix mentioned and I have done this to my oil bottle with great success. For those interested this is how I did it because I needed to make a few special hack tools. Step 1, get a piece of threaded rod half inch with enough length to reach the bottom of the tank and some more, screw on 2 nuts to the bottom, Take a largish half inch washer and cut a section out to the center making a U shape. This is then placed on the side of the threaded rod between the nuts and tightened. You now have a hook to force the spring washer up and out. ( Note only the spring clip) Not the float. My spring washer broke and I needed to get one similar from a store. Now that the spring washer is off you can turn the bottle upside down and a float and flexible magnet washer will fall out. Thoroughly clean the mating surfaces and glue together. I used Gorilla Glue. Using a thin long rod and some double sided tape place the repaired float back in place in the bottle, Note the magnet is on the bottom of the float. Placing the new spring washer was done with a piece of copper water pipe 6mm. I placed some double sided tape on the end to hold the washer, placed / fixed the spring washer to that and placed it over the plastic mount. Just a small tap with a light hammer was needed to engage the spring washer, not too much. Test and install into the boat. I trust this will help others and I thank Treasure Adventure Hunters

[@djpitr]

Thank you Martin , it’s been years when I fixed mine and made this video , and I still remember how much pain it was to fish it out the float locking washer ;) . I’m glad the video helped you , and thanks for super write up how to do it little easier :) . Happy boating Peter

[@RollerSpeargun]

@@djpitr You are welcome, thanks from Australia :)

[@JohnnyCab]

Good thinking!

[@daytongraves4404]

Very helpful thank you! Just recently acquired a bass boat with this same motor and I just unplugged the two wires and will just have to check the oil regularly

[@PaulHankins-fl8dq]

Thank you for posting. I was hoping this was the issue based on a forum post but couldn't find the wires to make sure until I watched your video. 2005 Mercury 90hp 2 stroke

[@johnandree]

Mate you are a legend. I was about to set fire to my boat then I stumbled across this video. All fixed now. Awesome video and well explained. Cheers bud 🍻

[@djpitr]

I’m glad I could help :)

[@stephenearly7412]

I have had the same constant alarm and have been trying to figure out what it was. Different engine (1995 200hp Merc XRI) but same issue. Your video was most helpful in my understanding of the issue I was dealing with. Many thanks for the video.

[@johnspillers79]

This happened to me today 6-3-22 on my way back to the dock. It had Plenty of oil so I got it home saw your video and raised a hallelujah that I didn't have to take it to the shop. I just disconnected the wires and that was my answer on my 91 115hp mercury outboard. Thank you so much 😀

[@cryptominingcar8368]

You welcome, lot of people have same problem

[@armagansabetian5269]

Same here with my 90hp mariner... the sound freaked me out the entire way home, thinking it was going to seize any minute. Watched this video and breathed a sigh of relief. Replaced the oil tank though🙂

[@MastaYates]

I thought this might be my issue but pulled off oil tank and drained it. Sensor out of hole and alarm is still constant. As soon as I turn key to on alarm is constant. Any ideas

[@dizzy5154]

​@@MastaYates I'm having the same problem.

[@Elmo_outdoors]

What wires?? I have the same motor same year same problem lol

[@48shams]

2003 Mercury 60 EO, same issue. Of all the other videos on YT this is the ONLY ONE to address what the issue actually is! Thank you so much! Ordered a new tank and will repair the original as a spare. Lifesaving video right here. Thanks again.

[@djpitr]

Thank you , I’m glad I could help :) boat shops are expensive:)

[@michaelpsotka3172]

Very helpful. I had this problem and just ordered a new(pre-owned) oil pump. Looks like I wasted $100 on the oil pump. Which I don't need to replace now! P.S. The buzzing doesn't come from under the dash, but from the throttle control unit. (i.e. the gear shifter/throttle handle)

[@jaybird5877]

Just got a boat, it does the non stop buzzing and will not start. Guess this is what's wrong

[@bradbain1633]

Thank you for making a great informative video in a area that has a lot of not helpful videos. You're the man!

[@djpitr]

I’m glad the video is useful

[@davidlivingston6888]

Thank you! That is exactly what I wanted to know about. On my boat, if the oil level is low and the bow pictures up, you can get a short alarm. I can see why, now. 😎

[@garyl6190]

Thanks for this most informative video. My 2005 50 bourse mercury just started to make the same noise. My two sensor wires are the same as yours and when disconnected kills the alarm. Again great video on the issue complete with sound solutions.

[@ShaneWere]

Yep absolutely awesome...I,knew it was the oil sensor but didn’t know where and what to do...cheers

[@jeffstewart1182]

Brother you just save me a lot of time and money. Bless you

[@DigitallyAnalogous]

Thank you for this video. I managed to disabled the sensor and enjoy a fathers day boat day.

[@djpitr]

Love it

[@nathancrowder8062]

Thank You! I have a 2005 Bass Tracker 175 that started doing that this year. Had no idea what it was. Our engines are different models but I was able to find the problem and eliminate the buzzing! Thanks again!

[@heatherhendercoop8643]

I have a 2005 tracker 175 50 HP same thing. Did you replace oil tank or just sensor?

[@djpitr]

From many people commenting about different size engines with the same problem, looks like it’s very common fault, u can’t just change sensor , u can repair it as I show in video or you have to buy the whole oil tank new

[@jeffroyer869]

Thank you for your video for taking the time to do it I had that exact same thing this weekend 20 some years old boat much smaller motor but same thing under the dash the bell went off Thanks again it was very helpful

[@djpitr]

I’m glad I could help

[@nolanly222]

This was the answer I was looking for thank you so much. Now, I can continue my fishing trip.

[@djpitr]

No problem , just disconnect the buzzer and enjoy

[@enduringpromise]

Thank you so very much. I just bought a used boat and it was buzzing as soon as I put it in the lake. It did not buzz when I was at the owners home.

[@djpitr]

You welcome, it’s very common in all motors with the mixing oil tank ,

[@MrMoccy80]

You’re a legend!! This happened to me on the weekend gone. Thanks for helping and great informative/detailed video. 👍🏼

[@mikes1798]

Thanks for posting this. It helped me determine that I have the same problem on my 1998 40 hp Mercury oil injected two-stroke. I disconnected the sensor from the wiring harness like you did and the constant beep immediately stopped with the engine cold. I will try the oil tank heart surgery operation too.

[@djpitr]

Good luck . Its pretty hard to get there

[@tomislavsinjeri9069]

Thanks for helpfull video. It helped me to solve constant beep on my Mercury 60 HP. I pul out the sensor and put everthing back together and every works fine. Thanks again. Best regards

[@djpitr]

Cool , no problem

[@todd7951]

Im sure this is my issue! I never had an issue until i was low on oil, but then it only constanly alarmed somtimes. Im sure it was a stuck float or something! So good to know!!!

[@kaseykingery6217]

Dang. I had this same problem this weekend. Thanks for the video

[@djpitr]

No problem

[@westbranchgrassman7004]

thanks this helped me fix my 115 mariner...Buzzzzzzzzz

[@gonzalovillabriga1862]

Genius, thank you for that man ! Good content 👍🏽

[@bookkeeper1429]

dude thank you for posting this is great info thanks

[@djpitr]

No problem

[@jponyboyace]

Finally ..yesss I have the same problem!!!

[@vanislerider7311]

FYI - If you chose to detach the two wires to stop the buzzer, be aware that one is for the oil sensor and one is for the heat sensor. Therefore the peeping alarm could be the heat sensor as in my case not low oil sensor.

[@cookiemonsterman504]

So disconnect one at a time and see which one, if any, stops the beep.

[@DigitallyAnalogous]

​@cookiemonsterman504 hmm. Just had this issue. I disconnected one of the two blue wires and the constant beep stopped. Oil full. Maybe I got lucky?

[@malcolmyoungacdc]

So the wires that go from the alarm module to the oil level sensor also receive engine temperature data? I'm having difficulty reconciling that...

[@diyhouserepairsandmaintena2503]

Wow , thank you , you saved me lot of money

[@april7_]

Thank you for this video! I have a 1996 Mercury 30hp 2-stroke and same issue! Float is stuck and when you take one connector loose that constant beeping stops! I will leave it without it, as my motor has a window for oil level and I hardly use even full tank of oil in season so no problem! Fixed so many things with KZbin! 😆

[@petelelas4896]

tank you. you just saved me money

[@djpitr]

Thats why i made the video for , a lot of today’s technology have stupid sensors and most of time it’s simple fix when you find the right one

[@Dancing-skincare]

Thanks heaps !! This just happens today

[@Djpitr1]

Nice thank you

[@mikaellissmatz877]

This was great:) l could get the problem fixed. Thank you alot, cheers

[@djpitr]

Nice

[@dionuku3519]

I have a 2006 Mecury 75hp 2stroke motor with the same buzzing issues, your video has helped me understand the problem. My only question is what can I use to fix the floater inside the oil tank..thanks 👍

[@djpitr]

U could try glue it back together or use any other float , or just keep it disconnected and keep eyes on the oil level :)

[@WillBuryU]

Changed out tank and sensor still buzzing constantly. I’m thinking impeller or bad module just ordered that too

[@smidsy1979]

Thanks mate, thats the same problem I have. Can you show how you managed to get the sensor out and put it back together ? I dont think I have the tools to do that.

[@djpitr]

It’s pretty hard :) you need long needle nose pliers and lot of patience

[@beer1fan]

Thank you so much!

[@djpitr]

No problem

[@upyabumnobabies1]

Legend

[@mcdouche2]

What wires to I have disconnect to fix the prop at 4:13?

[@planedoc84]

I thought the constant beep was the water temp sensor at least that’s what the mercury manual says

[@justinredman9607]

Omg...! thank you from Australia...?

[@djpitr]

I’m glad I could help , I was super happy when I figured this out too ;) it’s scared me on lake , I tough my engine was overheating or not getting oil for lubrication

[@WillBuryU]

100%German or Austrian

[@djpitr]

You very Close :) I’m Czech

[@soaringtuna]

Fantastic ! You helped tremendously!

[@Dinoxt12]

Thanks.

[@davidlaster4819]

This goes with out saying but let’s say it anyway. First fill up your oil resevore and see if it stops beeping. Kind of like if the engine won’t start make sure there’s gas in the tank.😉

[@gman8962]

Got mine out,but I can't remember if the magnet was on top or bottom of float. Think bottom. Anybody know for sure?

[@ronykuruvilla8454]

Awesome and thank you as I am able to nail the problem to the oil tank float assembly. The tank assembly from Mercury is on back order until November. In the meantime I plan to use the Mercury without the sensor and to keep an eye on the oil level. Question : Just removing the small screw under the tank holding the magnetic sensor probe and taking the probe out will do the job or do I need to disconnect the wires (two blue wires) leading to the probe? The wire appears to be complicated to remove as it seems fused together. I am not much mechanically inclined. Please advice. Thanks

[@djpitr]

Just disconnect it , no need to remove, until you get new tank or want to fix it

[@ronykuruvilla8454]

Can you advise me? Thanks. Can the wires be disconnected by pulling apart?

[@djpitr]

@@ronykuruvilla8454 yes

[@ronykuruvilla8454]

@@djpitr I removed the sensor from the tank already. No need to pull apart the wires anymore? Correct? I appreciate it. Thanks so much.

[@djpitr]

@@ronykuruvilla8454 yes , if you removed it , you are good , you can test it , it should start buzzing if you put some magnet close to it

[@roadvoyagerlife1759]

If I disconnect the sensor, how can I tell if the motor is still getting oil from the tank? I don’t want to disconnect sensor and run motor only to discover that it is a bad oil pump. Is there a way to determine that the motor is getting oil without running motor for hours??

[@djpitr]

Well , disconnecting the sensor is option u can do if you don’t want to fix it , when u disconnect and keep eyes on your oil in your tank , like every time you fill gas fill the oil tank also , you should be fine , the sensor das not tell you if your engine is getting oil or not , only if you have oil in your tank or not . The only way I can tell your engine is getting oil is to see the engine lightly smoke from muffler and to see your oil level going slowly down after driving it , I’m not aware of any sensor that will let you know that the oil pump is not working or the gas is not being mixed with oil .. the next sensor in that case would be the overheating one .

[@cookiemonsterman504]

​@@djpitr, and in that case, the engine would be pissing boiling hot water most likely! Correct?

[@djpitr]

@@cookiemonsterman504 well probably , what happens in many cases with boat engines is that they overheat when the water pump don’t work right , there can be some trash sucked in and restricted water flow , if your engine peeing nice strong stream of water the water pump is good and engine should not be overheating, only way I see that stream of water was really boiling hot is some major problem like crack head gasket .

[@saltwaterrazed2090]

Will that sensor stop the boat from running or starting? My boat started up but kinda struggled at first then ran idle for 10 mins and then shut off and started it up a few time and I had the push the knob on the throttle to keep it running but as soon as I tried to put it in neutral it shut off did that a few times and then I got the beeping

[@djpitr]

No , u can run it fine if you disconnect it , just keep eyes on oil level

[@marinaportocaribe]

Im looking for the bleed sistem diagram

[@dannyhowell3171]

Hey can you show how the harness connects to the motor

[@djpitr]

The wires coming from the sensor ?

[@gman8962]

Anyone have the part number for the tank? I cant find it

[@area46241]

Oil tank is for the out drive? A friend asked me for advice on this with inboard engine yesterday...mercury ski boat

[@realestatecashflowideas4188]

no , this it 2 cycle engine, the oil tank is for marine 2 cycle oil, the engine is automatically mixing the oil with gas for proper lubrications , inboard engine its probably 4 cycle with motor oil in the engine like a car , the out drive oil its separate on bottom close to the propeller there are 2 screws for oil level check

[@Ashton233]

Can someone advise on how to remove the temperture sender (temp sensor) on this similar Mercury Motor ? I've replaced the Thermostat but the beeping sound still on when running around 3k RPM. It seems that a rubber sleeve holding the sensor in place very tie fit. Thanks in advance !

[@gregjames666]

Will the low oil alarm also kill (shutoff) the engine ?

[@djpitr]

Im not sure , posibly there is some safety if left buzzing too long , just unhook the sensor , if you can crank it up without sensor, then that it

[@raygill8206]

So I have a 2013 Mercury Optimax 90 and the buzzer only alarms constantly when I get above 15 mph. Then it doesn’t seem to want to throttle up, is that normal for a low oil warning? The tank is full and it’s peeing fine and not running hot

[@getitdone6694]

Question on mine there is a module to the left of the tank and if I leave it plugged in the engine stops. It's about 7 inches to the left at the bottom. I unplugged the wire and engine starts. That is part of the warning system but I thought the buzzing is not continuous but intermittent for oil. It is continuous for overheating.

[@djpitr]

I really dont know what the buzzer das when overheating ..i know that mine if there is no oil or the sensor is bad like i show in video it will buzz constantly

[@brandondonahue3787]

Having same issue! Should my boat start when I have the sensor unplugged? Or will it start even with it beeping with this issue

[@djpitr]

It will start

[@lorenzodibari400]

Do you know if there is a tutorial to fix the oil tank? I'm in Italy and the automatic translation is not clear at all

[@djpitr]

No tutorial , they want you buy new oil tank , all you need to do is glue back the float , it’s pain to get to it inside the tank , bud when u get it and glue it back you good to go

[@lorenzodibari400]

@@djpitr to start thanks for the suggestion. I took it all apart and couldn't see if the magnet was at the bottom or top of the float. Should the magnetic washer be placed above or below?

[@jshdtrch1]

If you go out for a day and the motor runs for a couple hours, how much oil do you burn out of the tank? Mine has this same problem and I disconnected the sensor but I’m wondering if the sensor has anything to do with how much oil the motor gets. Seems like mine is burning a lot of oil. About 15 gallons of gas and burns about half tank of oil.

[@djpitr]

I depends how much u drive, it uses lot of oil , in day of driving ease 2-3inch of oil should be used ,and no this is only warning sensor that you need oil if the tank get low , or the flout brakes :) .. you are fine just disconnect it and keep eyes on oil every day you go out with it

[@rogermahler9686]

Same problem here, fixed 3 years ago however the glue I used failed again so alarm came back........I'm thinking if the magnet was on top of the float will it still work? (Just a lower level in the tank before it sounds) but never have to worry about the adhesive failing again.

[@djpitr]

Yes

[@jeffbutler9240]

I have the same problem but my motor has already had the oil injection deleted. I have a constant alarm going off. If you unplug the sensor from the wiring harness will that trigger the alarm to come on? If so that means I need to jumper those two wires together. Right?

[@djpitr]

Yes , jump it

[@djpitr]

I did not even know you can do oil injection delete , I have to look it to it , it always scares me that the system get clogged and stopes mixing oil in ,

[@jeffbutler9240]

@@djpitr thank you!

[@El_Capitan3]

Whats that gasket around the neck of the oil reservoir for?

[@tristanellul9441]

I have the same engine. Where are those 2 blue wires of the sensor connected to please?

[@djpitr]

I can look at it later today , probably somewhere to the main computer so they tell the main computer to turn on buzzer

[@tristanellul9441]

And the buzzer is installed on the engine its self and not a gauge outside of the engine?

[@djpitr]

That’s probably different on different boats , on mine the buzzer is under steering under dash , I disconnected when I was on water and when it started buzzing, it was too loud:)

[@henryenriquez5956]

THANK YOU !!