Carb leaking

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Sep 23, 2017 | 09:33 AM

#21

skinman13

Outstanding HDF Member

Joined: Dec 2012

Posts: 2,557

Likes: 235

From: Texas

Quote:

Originally Posted by 1stfxdwg

i followed your footsteps in the exact order, went so far as to replace the float also and it still pissed. "WARNING"! the problem with these epa compliant carbs is that they dont have a float bowl overflow tube that would normally channel the issue through a tube and onto the ground. Instead it weeps past the cv slide and into the engine, past your rings and dilutes your oil. my hydrolocked once and fortunately was very close to tdc or it could have bent a rod. here is what i found, it was the ****ing petcock! it makes no sense! a few months earlier i replaced the vacuum petcock with one of those cheap $20 ebay valves. it worked for awhile and than the carb started pissing. after all the carb rebuilds, float replacements, oil changes, i put a pingle petcock on and it cured it. i have no explanation other than voodoo, or gremlins. above all else change your engine oil or you will do some damage.

If the overflow valve is closing and seating properly, the carb bowl will not overfill and vent out of the overflow or backup into the cylinder, and unless the valve seat is damaged, a good float correctly adjusted with a good valve will stop the overflow.

I had the exact same problem once. The hydraulic lock was a little alarming and I fixed the overflowing fuel by adjusting the float. I never clicked on the vacuum petcock leaking into the bowl at the time. Once the float was adjusted and the overflow leak stopped, I didn't have anymore problems with the carb overflowing. Later, I found the petcock leaking around the diaphragm and I replaced it with a standard $30 aviation petcock (Pingle is WAY overpriced!).

Gently blow into the fuel hose fitting or spray carb/injector cleaner and gently manipulate the float by tilting the carb body and see if the valve working...if it is, then the problem is not the valve or seat...and the only other thing it can be is the float itself either leaking and sinking in the bowl, the valve is the wrong one and is sticking, or it is just not adjusted right. I have experienced all three and all cause the same overflow leak symptom.

I have cleaned and polished corroded float valve seats using a shaped wooden dowel or Q-tip and rubbing compound...