77 Lemans fuel/starting problem

I have a 77 Lemans with a Buick 350 from the factory. If I leave the car sit for more than 1 day it won't start again without pouring gas into the carb (Quadrajet) once I do that rev it up it runs fine. I have rebuilt the carb, accelerator pump appears to be functioning correctly and replaced the fuel pump and filter...none of this has changed a thing so any other advice would be appreciated...Thanks


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A all-too-common malady of the Q-Jet is leaking main well plugs.

They're located on the bottom of the main body and will be seen through the windows of the throttle plate/body.

These plugs will allow the fuel to slowly drain from the float bowl then next time you go to start it, you'll have to crank until the fuel pump fills the bowl again.

Pumping the accelerator pedal as you crank will get it started, usually. But it requires quite a bit of cranking, mind you!

These plugs can be carefully re peened to seal them (there's also a similar plug for the accelerator pump circuit, IIRC). This will require disassembly.

Some recommend sealing w/JB Weld, etc, but I've found that over time the epoxy will deteriorate and loose adhesion. If you decide to go this route, the areas where the epoxy has to be immaculate- totally free of grease, etc.

Hi. Thanks for the reply. I understand what you are saying but I wanted to mention that I've cranked on it for 5-10 minutes pumping the heck out of it and it will not restart unless I pour gas into it. Do you still think that is the only problem? Thanks again....