I've noticed that sometimes the shaft portion of the accelerator pump 'sticks' after being pushed down- that is, it doesn't follow the pump lever back up when the pedal is released. This seems to happen only when the engine is cold-once it's warmed up it stops. I don't think the pump itself is sticking (it's a new assembly btw- I replaced it a few months ago), but the shaft is sticking on the o-ring that's in the body of the carb. I tried lubricating the pump shaft with graphite and while it would work for a day or so it'll go back to sticking again. Could I use light machine oil at this point without having to worry about any build up of dirt, which would just add to my problems?

Thanks!


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Original owner - '84 T/A w/stock 305HO 5-speed

 

Mine is doing the same. Let off the pedal and the pump remains stationary and after a second or two it slowly rises to the lever. I checked my father's Chevy PU non CCC Q jet and it immediately follows the lever back to the top.

Anyone?

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1986 Black/Gold LG4 Z28
Original Owner, 200,000+ near trouble free miles.
Mostly Stock.

1995 Dark Red Metallic Corvette Coupe Original Owner

 

I don't even use the o-ring. Have run my QJets for years and years without them. Never a problem. If you're going Baja/off-road racing then probably not a good idea but for a street car, you'll never miss it.

 

True, and in hindsight I would've/should've left them off when I had the carb apart. However I'd rather not have to open up the carb again just to take the o-rings out...