Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Rebuilt--fires once, won't restart 7044203

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Kenth:
You may have fuel inlet system issues. If lift clip on inlet needle is used it should be hung from behind on float arm, NOT in one of the holes in float arm as this will bind the needle and cause flooding.
I always turn the carb upside down, connect the vacuum pump to inlet fitting to check it holds vacuum before mounting the carb.

67elco:
I pulled the top off the carb just now and verified the clip on the needle was hung correctly on the float arm. I adjusted the float height lower slightly as well. Needle was moving smoothly in and out of the seat.

I removed the old spacer as I found it was causing a vacuum leak, so now it's just intake manifold, gasket, and then carb. 

I installed a fuel pressure gauge between the pump and carb, and it's consistently reading between 8-9 psi.

I swapped in a new fuel filter as the old one looked like it had been in there for a long time. Old one wasn't clogged, but it was dirty.

I also adjusted the choke flap rod to be slightly less curved.  It still is not setting the choke flap in the proper position on one pump of the accelerator pedal.

The car turned on, but ran like it was on 7 cylinders. It ran for maybe 2 mins at most, but afterwards I used my IR thermometer on the exhaust manifold and noticed cylinder 1 was colder than the others. Pulled the spark plug out and it was slightly wet with fuel, double checked the gap and it was a bit wide, so I gapped it down .035.

Checked the plug wire on #1, it was fine. Checked the distributor cap, looks very clean and inside and the rotor looked almost new, very clean as well.

Tested the ignition coil resistance and it was around 12.3 from the side posts to the center, and roughly 1.5 from side post to side post.

Pulled the left valve cover and lash on the #1 cyl rocker felt the same as all the others, no indication of a mechanical problem.

Car still won't run unless it's sat for 4-5 hours, and then runs once, very poorly and won't stay running.

77cruiser:
If it has 8-9 lbs. fuel pressure it could be flooding.

67elco:
I ordered a regulator, hopefully that will help. The fuel pump on the car is aftermarket, but unknown what brand.

Cliff Ruggles:
Fuel pressure isn't the issue, that carb will EASILY take 7-8 psi if not a tad more w/o issues.

You mentioned "stock" engine. Did you use the correct gasket and stainless steel shim gasket, then the carburetor?

Those parts are REQUIRED in that order or the engine will not run well, if at all due to a HUGE leak at the hot-slot allowing butt-loads of exhaust gasses into your engine.........

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