Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Freshly rebuilt quadrajet flooding from top of carb

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Tarrcamp92:
Hi there. I'm pretty new at the carb stuff, so I just recently got my carb rebuilt put it on fired the car up started no problem but as soon as the car starts to run fuel starts spraying from the top of the carb and the car stalls, from what I've been reading I'm guessing the float is being the problem? Just wondering if anyone knows why it's doing that and what can I do to fix it?  Thanks

Cliff Ruggles:
Float not holding down the needle or leak at the needle, or under the fuel inlet seat. 

The upper portion of the hinge pin can get bent down and not keep the float in it's correct geometry.

Could also be a piece of debris stuck under the needle.

I've also seen scenarios where the carb will flood when the bowl fills up quickly and the incoming fuel holds the float down and woln't allow it to seat the needle.  Usually you can just shut off the engine and wait a moment, then re-fire it and all will be fine.

The float and needle/seat set-up in the q-jet is a very simple design, and seldom gives troubles unless the float setting is incorrect, fuel pressure too high, or something is stuck under the needle.  In rare cases the float arms may be bent enough to cause the float to "drag" on the sides of the bowl or the arms drag on the PP housing and cause flooding, but this would be pretty rare and should have been caught during the "rebuild"......Cliff

Tarrcamp92:
Okay I will look into that thanks for the help!

daveqjet:
hi tarrcamp92,i just had a similar problem but not flooding as such but a filthy rich idle blowing black smoke and stalling if I didn't hold the power on with foot on brakes when stopped,my float had absorbed fuel and lost buoyancy,took me a while to figure it out,lucky I had a spare.

gregcarter:
My float expanded and stuck at the bottom of the float bowl every time I rebuilt my carb. I had to stick a bent pick down the vent and lift it. Then one day I woke up and  realized it was no good after I almost got stranded 80 mile from home, and I chucked it.
No I didn't.... I shaved it down until it couldn't catch on the sides of the bowl. Then the next time I got a brass one and stuck that in there.
This is on an Edelbrock 1902 carb on a stock 350 in a truck. Since Edelbrock doesn't sell a brass one, I chucked that one out and got a phenolic one.
gc

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