Carburetor problems

I've got a Celebrity boat which has been having carburetor trouble lately. The carburetor is a Rochester Quadrajet Carburetor, Model

4MV, Rochester No.17083515. It is used on a 1985 Chevy Marine engine, V6/229 cu.in./ 185 Hp. Droplets of gas can be seen in primary bores (both sides) dripping from somewhere stalling out the engine after a few minutes. A new carburetor ran fine for a year but the same problem is back again. The original carburetor was rebuilt a few times but the problem persists.

Anyone have any ideas?

Thanks, Eric

Reply to
Nikyu
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First thing I'd do is check the float. If the float is not "floating", or is hung, the fuel pump will pump gas directly through jets.

Old Mopar products used to have a problem where the float was a plastic material that would get gaslogged and partially sink. The car would run very rich and flood easily. They kept making these floats from same material for a decade or more :-(

A hole in a brass float, or corrosion or gum on float hinge is also possible, or dirt in float valve keeping needle from closing all the way.

Reply to
Don Stauffer in Minnesota

Sunken or stuck floats, or float level set too high.

Reply to
Steve

I get a similar problem every couple years in my Jeep with it's carb engine.

The fuel they now have seems to be bad for gumming up float needle slides. I need to pull my needle and seat out and clean them or kit the carb every couple years. It is the sliding area in the seat portion that gets gummy.

At least on mine the needle and seat come out from the outside. :-)

Mike

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Reply to
Mike Romain

Droplets/dripping are a sign of something as simple as a vaccum leak or the air mixture screws not adjusted correctly. If you've eliminated those two, then your float is a little to high, the needle and seat are bad, or has some dirt in it. Might want to make sure it's venting/ purging also. The float only has to be 1 or 2 32nd's to high to create a problem. They are a little tricky to get just right.

Reply to
dahpater

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