Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

17084223 float height

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65malibu:
I never noticed it in reverse. It mainly does it if I have to stop at the bottom of a hill or stop quick. I can keep it running by giving it a little throttle and after a few seconds all is good. I've tried to look down the carb when it starts dying and didn't see any fuel
dribbling in. Maybe your onto something with a hole in the well or possibly leaking through the airhorn gasket?

Cliff Ruggles:
I used a 1977 Pontiac Q-jet on five different engines that powered my 1973 Ventura and didn't use the clip on the needle or plastic filler in the aneroid location.  I logged at least 100,000 miles on that carb and thousands of drag strip runs, with PLENTY of hard braking and power stops and never once did I experience a flooding scenario, and the float was set at 9/32".

I'd add that I used as .145" fuel inlet seat and 8.5 psi fuel pressure.

Even with that said I've had a few complaints over the years where folks experienced momentary flooding when hard braking or panic stops when they left the plastic filler cup out, so if you have one I'd certainly put it in the carb as there are no negatives that I know of from using it.

I've also had a couple of complaints when folks left the clip off the needle that it got "glued" in place when the carb dried up.  Makes me wonder what type of fuel they were using that left sticky residue behind to cause that, but for sure if you use the clip and adjust it correctly that's not going to happen if/when you leave the vehicle sit for weeks and months at a time.

Anyhow, adding bowl volume is a complete waste of time/funds and that would be the only reason I can think of to leave out the plastic up on a later carburetor.  In any and all scenarios you simply need to keep the bowl full.  This means paying attention to fuel delivery and fuel inlet seat diameter not adding more fuel to the bowl......

65malibu:
The carb didn't have one in it when I rebuilt it. Is that something you sell or should I go scrapping? I will also check the well for hole in casting and possibly stains from leaking at the air horn gasket. Could it be leaking into the cavity where the idle bypass air pulls from? I'm just spit balling here as I don't have the carb apart yet.   

Cliff Ruggles:
I have a drawer full of the plastic filler cups.  There are several variety but the most common in the mid to late 70's are the completely round ones.  Some later carbs have odd shaped ones that fit specifically into the "notches" in the main casting to locate them.....

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