mercury 65hp carbs dribbling after running

jbjennings

Captain
Joined
Jul 18, 2007
Messages
3,903
I've timed this cursed thing with a dial indicator---you guys were right, it was several degrees off. Shocker, right?! :facepalm:
Now the danged thing is leaking fuel out the throats AFTER it idles for a while on the muffs. I tried some of my other carbs and they do it, too. I'm figuring after multiple float needle settings, that I have the needle arms set perfectly, but the needle is not seating good enough to keep a little fuel from coming in. It's using it all while running, but not when it stops. I can't get fuel to come out squeezing the bulb, but it does after running a while. I've ordered brand new needles and seats and hopefully next year some time I'll have completed this darned thing. I have to say, OMC's are lots easier than these mercs........ you guys that do the mercury motors for a living and a hobby are no doubt outboard experts 1st class! DO you guys think the needles and seats will solve this problem, or do I have something else wrong?
Later,
JBJ
 

bgc

Ensign
Joined
Jul 13, 2011
Messages
980
Re: mercury 65hp carbs dribbling after running

Yes, OMC's are easier to work on....but who wants to go boating and not tinker with their motor.....

Two things I found that caused mine to leak;
The measurement gauge Mercury sends with rebuild kit is used resting on gasket surface. My floats were too high causing fuel to flow out.
I use the choke to stop the motor, fuel pukes out..

Try adjusting so the float sit 2-3mm lower in the bowl.
 

MH Hawker

Vice Admiral
Joined
Jul 13, 2011
Messages
5,516
Re: mercury 65hp carbs dribbling after running

Floats are often over looked, they get heavy and wont seal off the needles.
 

jbjennings

Captain
Joined
Jul 18, 2007
Messages
3,903
Re: mercury 65hp carbs dribbling after running

Thanks for the suggestions guys, will do. I 've got several floats, and they all do it (of course, they're all old). I would replace but they look ok and I can't hear any fuel in them shaking about.
I love to tinker on mine, but not when the crappie are biting! :)
 

AChotrod

Petty Officer 1st Class
Joined
Aug 25, 2013
Messages
382
Re: mercury 65hp carbs dribbling after running

Reeds could be worn/chipped. At least thats what my service manual says in the trouble shooting section.
 

MH Hawker

Vice Admiral
Joined
Jul 13, 2011
Messages
5,516
Re: mercury 65hp carbs dribbling after running

Well its only dribbling a little bit so yes by all means use the old ones.
 
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