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Old 07-26-2012, 10:25 PM   #26
76C10Stepside
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Join Date: Feb 2012
Location: Olympia, WA
Posts: 300
Re: 305 QJet Problem

Thanks, man! PM Sent!

I thoroughly cleaned the carb, polished the throttle bores, etc. Put it back together and installed on the truck last night. The Throttle worked, but it would not idle.

Today I found that the choke butterfly was not closing all the way, sticking. A drop of oil on each end fixed that. Truck started and idled ok at first, then started idling waaaay too fast. Found gas dripping from the inlet, and fuel vapor coming out of the front of the base gasket.

Tried to stop the leak, no go. When I put the inlet back on last night, I used the two gaskets that came in the kit (black with metal core and red paper), instead of just using the black one. I've had problems with the inlet coming loose in the past and figured two gaskets are better than one. Guess not. Will remove one gasket and see.

The base gasket was new, but last time I pulled the carb off, the new gasket left some bits of the paper top layer behind. When I put the carb back on last night, I put a little oil on the mating surfaces to keep them from sticking again. I'll put the old base gasket back on tomorrow.
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