Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Q jet Bog

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greggome:
While trying to correctly diagnose the problem before tearing my carb apart, I ran across this online info from thecarburatorshop.com "It is very easy to test the function of the accelerator pump. Start the engine, and warm to normal operating temperature. Shut off the engine. Remove the air cleaner. The choke butterfly should be fully open, as the engine is warm. Observe the pump jet in the carburetor, and with your hand, work the carburetor throttle to the wide-open position. You should observe a healthy squirt of fuel from the pump jet."

I have followed this method and i do have a good squirt of fuel from the pump jets. Wouldn't this confirm the proper operation of the accelerator pump?

Cliff Ruggles:
Not always as the seal can still push some fuel with a rip or tear in it and that test woln't tell you if the check ball isn't sealing well and allowing fuel above the check ball to drain back into the carb causing a delay in delivery from the pump (common problem)......Cliff

greggome:
Never tried tearing a Q jet apart. To replace the accelerator pump seal apparatus are there any diagrams/instructions available as to the disassembly procedure?

Cliff Ruggles:
Accl pump replacement only involves removing the airhorn, and at most you would need besides the pump assembly is a new main body to airhorn gasket.

Our top gasket for those early units is .015" thicker than stock and much better material, plus when you order our pump you get the entire assembly with new springs/retainer, and it's lifetime warranty......Cliff

greggome:
Since the bog takes place when I am driving and press the hard on the accelerator should i expect to get the same bog when I stomp the gas while in neutral if the accelerator pump is the culprit ?

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