Reason for Outboard Motor Bogging Down | See What I Discovered

Here is a possible reason for outboard motor bogging down. My Mercury outboard was bogging and stalling at almost full throttle after about 10 mins of running. I couldn't believe it. After some research online I learned that the gray fuel line that you can buy in a kit and comes with a primer bulb is no good.

These gray fuel lines have a liner that doesn't hold up well against ethanol that is in gas.

So I bought some black rubber fuel line to replace boat gas line and that eliminates that problem.

Did I help you out?
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#outboardmotorbogging #outboardbogsdown #mercuryoutboardrepair

[catalinoburgos-flores]

Thank you for the advice, had exactly the same problem, now is fixed. I have a 1999 60HP Mercury outboard and now it works perfectly thanks to you from Puerto Rico.

[williamtukeyjr]

Very true, but the black hose breaks down over time too--best to change it often.

[jonnschulz]

Thanks, I'll let you know. Had the same suspicion.

[Runyon]

Thank you for this video. I replaced the two fuel filters and saw a minor improvement, then replaced the gray fuel line and we're back in business.

[MagnusLundberg]

Also having a bogging down issue after aprrox. 5 min...(40hp mariner 2-stroke, 2005) Have more or less changed everything from fuel tank to clening the carb several times, but still having this issue. Found out that my newly bought Mercury/Quicksilver original grey hose with primer bulb manufact.date 22-10-02 (8mm) had a problem...I cut the connector to the fuel tank with a knife just at the end of the connector to shorten the hose by a meter and by coincident looked into the hose and there it was...a "treshold" in plastic reducing the fuel flow with 50%...this was without doubt caused in production due to heating up the connector (or hose...) before pushing the hose on the connector. and caused the inner liner to melt..and it didn't stop there, curious as I'm a cut the other three connectors, primer bulb (2) and the motor connector, and they all had the same "threshold" (which was not flexible). Too bad for me it didn't solved my bogging down issue.

[TimsWorkshopTJY]

My motor just started this stalling issue last time out on the way back to the launch. I burn ethanol mix unleaded fuel and have for years with fuel stabil in it. I haven't changed the fuel filter in 3 years and my fuel hose is the gray line. I did put all new fuel black hose on the motor but need to replace the ball fuel line going to the motor. l'm sure that is the issue and will fix this over the off season. I live in the opposition part of the country so haven't heard about fuel line laws around here?

[donaldchandler]

Thanks so much for the information my 1983 evinrude 35 HP outboard is doing exactly what you described

[RayWhalen]

i know those motors pack alot of technology inside the cowl but no fuel filters and such should be difficult to access!

[alpoktemornek]

Thanks for informative videos, I have the same issue with my suzuki 30 hp. It starts and goes for 5 minutes and starts bogs, have some rest and the same thing again and again. I changed the fliters, water separater, fuel filter, cleaned fuel tank, changed the fuel, but it does the same thing. I will try the hose and see the result. Thaks for the video…

[roger]

Great video - I am experiencing the same issue and just ordered the new fuel line from Mercury, which does not have the liner. Quick question though. I have a 2008 Mercury 40 hp, but the fuel line is 5/16. Your new line is 3/8th. Any reason you went with the larger line or did yours come with 3/8th? Thanks agains!

[MichaelSmith-rnjz]

My boat motors doing the same thing appreciate all this advice

[Brendan]

Great stuff, problem solved! Thank you from Ireland.

[KeithFleming-qskh]

Great video I'm having the same issues thanks

[shepss]

I too had the same issues with my yamaha, the gray line delaminated inside and the plastic would collapse causing a starvation of fuel, good video thanks

[jrgoins]

Hey brother, I liked ur video. Having similar problem with my 90hp. I changed my grey line out a few months ago bcuz A buddy told me it was better. After running this by my outboard mechanic he told me Down here in Florida if ur going with a black auto fuel line not a good idea. It gets very hot in direct sunlight nd even starts to melt. I thgt he was full of shit but after it has bn on for while now I think he was rgt. Just fyi. For florida I think ur better off with grey, just have to keep an eye on bcuz ur 100% correct, It does break down the liner inside after a while. Thanks for info!

[hifivingstarfish]

Where did you get your black hose? Auto store? If you can provide a link, that would be great.

[kristinedeguzman]

Same thing is happeing to our motor. Interesting that we have the exact same motor. Ours is a 2005 Mercury 40ELPTEFI. We don't have a gray fuel line, so fingers crossed that if we change the fuel filter, it will work.

[danielrobert]

I also had a grey fuel line disintegrate on me but the culprit is not ethanol which's only downside is that it attracks moisture (water) over time. Use your fuel within a month and you"ll never have problems with it. THE problem is with benzenes that are really bad stuff that apart from causing cancer will break down plastics and most rubbers. All gasolines refined from oil has it. By the way, double-check at your gas station since most (if not all) premium fuels now have ethanol added. Regards !

[JackieV]

I had this same issue and stumbled upon your video and after I bought a new tank and put the old grey fur line on it it still wouldn’t get fuel correctly and then I found your video and checked mine and had to change it out to the automotive fuel line like you did. But now I have to pull the carb and do another cleaning because it will only run when I work the choke to keep it running

[carlosvelasquez]

Same happens to me today now getting black house ty