Gas in my Oil? Mercury Outboard Motor Issue Fixed
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- Опубліковано 1 січ 2021
- #boatfail #outboards #boatissues #boatfix #fuelpump
So I pulled the oil dipstick on my Mercury Outboard Motor to find gas in my oil. Of course I was concerned, but I found the fix and its up and running again.
Fuel Pump I bought: amzn.to/38YK3DX
My OEM fuel pump part number is: 880890T1 - Навчання та стиль
Thanks for sharing this information. Very helpful and it was our problem.
Glad it helped.
It did help!! We have the same motor. This is what our motor is doing. I have change so many things that had to do with fuel. Now we know what to do. Thank you!!
Glad it helped. Thanks for watching.
Thank you for posting this. I thought I had water but after checking my fuel pump it was leaking like yours. Thanks again
No problem. I was hoping I could help since this was new to me too. I have never had gas in my oil like that before. Now I will be checking it regularly just to make sure.
Thanks for the video! Helped out a lot...Couldn’t find any videos about this problem. Going to buy a new fuel pump now!
Glad it helped! It was new to me too. Hope you are up and running soon.
your video saved my engine, i have the same problem, so its off to the shop, thanks for the share, from the uk.
Sorry to hear you had the same issue, but it's good to catch it early. Thanks for watching!
Thanks, really helpful. I have the same issue with my Yamaha 115 4-stroke right now. will have a look at the pump!
Glad it helped. Good luck.
Thanks mate. This video has helped me with my merc. Definitely what the problem was
Glad it helped. The cheap fuel pump I got is still going strong.
I'm pretty sure this video saved my life. I had a stuck float issue on my Polaris Trail Blazer 330. I got the carb out and fixed that and noticed a whole lot of gas in the intake on the motor side of the carb. I sponged it up and out and determined it was caused by a clogged carb bowl drain hose (maybe that contributed to the float issue... I dunno). I got the thing running again but it continued to reek of gas but ran okay and no leaks I could find. As I was contemplating what was going on, I recalled this video and thought hey... maybe some gas got into the oil since so much got past the carb into the intake. I pulled the oil dipstick and a mixture of oil and gas came STREAMING out! Turns out I'd been driving around on that ATV with an oil pan absolutely filled to the brim with gas and the original oil. I'm pretty sure that means I was driving around on a gas bomb just waiting for the right spark to show up. So.... thanks for this video. Had I not seen it, I don't know that I'd have thought to check the oil so soon in my ATV and who knows what could've happened.
Dang, that's crazy. I thought the same thing when I pulled my boat motor dipstick. All that gas could have just blew that thing up. I guess they do that by design for whatever reason, but it's scary. Glad you found that before something bad happened. I am sure the engine does not like it either.
Thanks SeidelRanch for fixing the Fish N Jugs boat. We are ready to go now.
Anytime Fish N Jugs! Lets hope there is no more fixing in the near future.
Big help to me, I was having same problem and now I got it, thanks bro
Glad I could help. Good luck.
Great video for the types of issues!!
Thanks. Hope it was helpful.
Many thanks to you for this video. It saved me some money.
You're welcome! Glad it helped.
Thank you so much helped me out tremendously
You're very welcome! It was a 1st for me.
Thanks man! This video helped me out tremendously!
Awesome. Glad I could help!
Awesome. Glad I could help!
Good video thanks for sharing.
Thanks for watching! Hope it was helpful.
Same problem here. I bought the actual Mikuni replacement for $240. I had read reviews on the cheap $35 units and they pop the diaphragm a lot, but if we are aware of this problem…. Your suggestion of checking regularly is a less cost effective idea. At $35 I could have bought several and kept them shelved like my own parts store store hahahaha. Good video.
Btw. My mercury 115 was running fine I shut it off to fish. when I restarted my boat would never plane out and only had a top speed of 10 mph.
Yeap, we were running fine then we turned off the engine to fish. Could never get it to stay running after that until I fixed it.
I keep an extra in the boat now just to make sure, but the one I bought is still doing great like it was new.
Thanks for the video
Thanks for watching. Hope it helped!
Thanks for the video. My 2005 mercury 90 fourstroke is showing over filled on the dipstick. Wont go over 3500rpm and oil is also leaking from fuel pump. Gonna pull pump and prime to see if it leaks fuel also. Thanks again!!
Glad it helped. I bet it's the same issue. Let me know how it goes. Hope it's simple.
I'll be checking my fuel pump also. Same problem of fuel in the crankcase oil.
Sorry to hear you had this issue, but good that you found it. Good Luck.
Thank you you are right there is nothing taking about this this same thing is what's going won't work mine
Yeah, it puzzled me too in the beginning. I did not know these engines did that. Thank for watching and glad it helped.
I have a pair of 2005 115 Yamaha Outboards that I bought a few months ago. The previous owner put ethanol into the boat and just let it sit for a year or two. The fuel absorbed a ton of water which ruined the fuel pump diagphram I think. Then the dirty fuel pumped into the oil just like this, except the oil turned milky brown as it had so much water. All this took me a while to figure out and the right outboard actually caught on fire before I realized what was going on. I got the fire out before serious damage occurred and have changed the fuel pump and thermostat out and it starts up like a new motor. But long story short, this seems to be a common problem in 115HP engines from around that year as they all share the same fuel pump design. Your mercury fuel pump looks interchangeable with my yamaha version.
Glad you figured it out before it was too much of an issue. Luckily the issue has not come back for me.
For anyone watching this to troubleshoot their problem - if you pull the fuel pumps and find they aren't leaking fuel into the crank case (like mine), check that your thermostat isn't stuck open (like mine was lol). A cold running engine will cause fuel to pass the rings and collect in the crank case.
Good info to know. Thanks.
I have this exact problem, only I changed the thermostat becasueb I noticed on flushing the engine it wasn't cycling through hot and cold from the tell tale. I guessed it was running on choke all the time hence the overfuelling and the petrol getting into the oil. Unfortunately, it still kept making oil, so the pump will be next, 1
That pump is just a fancy petcock really. Hope the replacement holds up for you.
You and your petcocks. 😂 But yes, I hope it lasts at least a year. We will see.
WOW Thanks!
No problem! Hope it helped.
I have a YAMAHA 115HP, very similar to yours Mercury. Seems they are made by the same manufacturer, miner difference. I have changed the fuel pump and thermostat
not long ago. The boat was parked for a while, so I decide to run it on idle for some time. Then this happen to it too. I thought the engine was shot. Happy that's not the case. Will not run idle for extend time anymore.
Glad you got it fixed. After fixing it, it's been doing great.
Hoping this is my issue. I noticed the oil coming out of the dip stick when i checked it. Didnt look cream colored but thinner oil with a smell of gas. Also before winter I thought I had more gas in the tank than I do now. Havent fired it up this yr yet. Taking it in this weekend. Good video
Thanks. Good luck. Hope it's this simple. Mine is still going strong since, so it should be an easy fix if it is this.
Just now happened to me. Same engine. These yamamercs are a nightmare. I’ve been chasing cooling issues forever. Power head will have to come off at this point. Great video though
Sorry to hear that. Luckily, mine has been mostly good. Hope you find an easy fix.
Thanks
You are welcome. Hope it helped.
Thanks for the video!
You're welcome! I hope it helped.
2005 90HP EFI, I noticed our oil was very runny off of the dipstick, and has a fuel smell to it. It sounds like it’s the fuel pump could be the issue.
I hope the new fuel pump fixes it. Keep me updated.
So that is why you got stranded on Granger Lake. I think I could keep an eye on that.
Yes, this was the issue. It's fixed now.
hi, great video, by any chance have you changed the thermostat?, if so, could you tell me where it is?
I have not, but I think it's on the same side of the engine as the oil filter and toward the top. It should have a rubber hose going to it. I can try to make a video the next time I check it. Hope that helps. Let me know when you find it.
Disconnect the lines & run theme into each other and put a low pressure electric lift pump on & it will never happen again.
Hmm. That's a good idea. Bypass this diaphragm pump altogether.
This only ....only applies to NON-EFI motors. If you have EFI YOU DON'T HAVE ONE OF THESE PUMPS. Now I have two of these fuel pumps in the box to sell....let me know if you need one.
My mercury had its thermostat stuck open. It wouldn't warm up properly so the computer was dumping to much fuel to it. Change the thermostat and fixed problem
Glad you were able to get that fixed. How did you find the issue?
Thanks for the video! How did the aftermarket one hold up? I’ve got a cracked plunger portion so my crankcase is leaking oil. I’ve ordered the aftermarket version and may just swap plungers as well as the silver part works just fine? Just curious how it held up and if it’s worth just swapping plungers as you did?
Mine has been doing great so far. I keep an eye on the oil just in case and no fuel smell at all to date.
@@SeidelRanch awesome!! I may just leave the aftermarket one alone and save the original as a limp home version as although cracked it’s a very small leak and would get me home in a pinch. I almost may just buy another aftermarket as a back up!!!
@seidelranch, how is the aftermarket pump holding up? Getting ready to change mine out
Still working great. I think it will last. Still looks fine.
I juat find out my oil smells like gas and I have this car for 4 month ,I heard Chevy Trax had that problem ,mine is a 2020 ,I hope I didn't do a mistake buying this suv😒,but everything running fine.
Luckily you should be under warranty, so take it in. I don't think automotive engines are laid out the same as boat outboards.
@@SeidelRanch exactly I took it for a oil change and they didn't want to saying I still don't need one ,but I have 4000 m + on it already
I have the same problem with a 15hp tohatsu i change the pump but after a couple months the oil was full of gas
So you changed the fuel pump and are still having the issue? How much gas is getting into the oil?
Awesome video, I have the same motor. Did you end up cleaning the filter in the VST after that?
I didn't, but have cleaned it since then. Pretty much went through the whole thing not too long after.
@@SeidelRanch been debating doing mine... just working up the courage.
So when I pulled my fuel pump out, and squeeze the bulb, no fuel comes out or sprays out of the pump. But there is 100% fuel in the oil, and the oil is runny as you stated. Could it still be the fuel pump? I have one on order, and plan on changing out pumps, but I was hoping to get some opinions.
My pump leaked through the diaphragm so you could see it leaking. If you can squeeze the bulb and it pumps fine out the hose and you get no leaking from the pump, then it's not the same issue I had. That said, you could still have a leak but it may be in a different part of the fuel system like near the injectors. Let me know what you find out and I will ask my boating friends also to see if I can offer suggestions.
I’m going to see if my 2007 90 hp has that fuel pump. I have the same problem
Did you find the issue?
@@SeidelRanch not yet
My son just went out to his 40hp Yamaha yesterday pulled the dip stick and his oil was full of gas no problem beforehand I wonder if this could be the problem on his
If I had to guess, yes. That rubber plunger can crack and suck fuel in quickly.
Did y’all bring it to a shop? I’m starting to wonder if all fuel injected 4 strokes “make oil”
Does anyone have the after market fuel pump part #? Where to buy?
This is the one I ordered and it worked fine: amzn.to/3MiFh7s
Is it the same for carburetor engines I have the same pump doing the same thing
I bet it is, but I am not sure. I think this type of pump is common.
The question you didn't answer is why the fuel in the oil made your motor stall. Presumably the carb was still getting enough gas unless the entire flow was diverting to the crank case (unlikely).
It was not pumping the fuel into the fuel injection pump. Basically the fuel pump suction was not working because the membrane was cracked and not allowing the pressure to build in the fuel system. The gas was mainly getting into the crank case from me manually pumping the bulb in the fuel line and since there was a crack in the pump it was just pouring it into the crank case.
@@SeidelRanch oh damn...that's crazy. I have fuel in my oil too and I only noticed when troubleshooting after the motor died after trolling. I discovered a wet plug and after cleaning all 4, it's been running great. I assumed it was unburnt fuel just passing the rings after a 15hr day of trolling, but now I'm gonna pull the fuel pumps and confirm I'm not having your same issue.
Thanks for the follow up!
Did you ever find an obvious issue?
Do you think it is the same issue on the Yamaha outboards
Since Mercury and Yamaha outboards seem to be very close design wise, I would say yes.
The early 2000s mercury efi motors have a Yamaha power head and a mercury lower unit. Since the fuel pump is part of the power head a Yamaha 4 stoke of same vintage would have the same exact problem since it is the same power head.
How long did the Amazon pump last?
It's still running fine.
@@SeidelRanch
Wow that’s awesome $40 part did the fix you use the engine a bunch?
Also how did you flush all the bad oil out when it got mixed with the fuel?
@@timboyd5402 I would say about normal usage. I am sure the part is close to the same quality as the OEM one. I was skeptical since it was much cheaper, but so far it's been great.
Def not my problem. I have oil. Milky oil pooring out my district hole. Think I have a stuck injector
What is the district hole? Milky oil typically means water and oil.
We had the same issue lol, it happened right after installed a brand new fuel pump… it pored out like 2 liters of fuel…
Did it really not damage the engine after running the engine with fuel in Oil?
The new fuel pump was bad, i Think i was unlucky and received bad fuel pump, and the Old One was only damaged and didnt want to suck anymore…
But really worried about if it Can crack all the sealings and shit
I don't think it's that big of a deal as long as you don't keep running it that way. Basically it thins out the oil and reduces lubrication in the engine. I did not see any issues from it other than the pump itself. Many people flush their oil systems by putting gas in the oil to thin it, run it for a few minutes then drain it. I don't recommend that, but it's been done.
@@SeidelRanch actually my status is, we changed the fuel pump 2 times, both times we got fuel into oil - we are buying a original pump now due to we not sure these aftermarkets works that good
@@FarmerKamikaze Sad to hear you had so many issues. Mine is still doing great. Quality control can be an issue with aftermarket pumps.
@@SeidelRanch yours matches the original very much, mine has a flat surface and not round like the original
@@FarmerKamikaze I see. I tired to find one that was like the original. Good to know, Thanks.
Did your gas look like chocolate milk?
No. Nothing was getting into the gas. The gas was getting into the oil. The oil looked the same but had a gas smell. If you are getting milk like oil, that would be water getting in.