I've had similar problems. On my truck, the carburetor fuel inlet is ~34 inches which is approximately the same as the fuel level in a full tank so I know there is fuel in the line. I see fuel stains on top of the carburetor which leads me to believe the fuel is boiling out after shutdown. I've also found if I run cool water over the stock fuel pump my idle becomes more steady. Turn the water off, wait a few minutes, the idle gets more lumpy and engine speed slowly decreases until it dies. I repeated this a few times. And this is with the hood open.
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Originally Posted by Rich72C10
This morning, my hard start came back with the Carburetor. She would turn over, get up to Fast Idle and die. This cycle continued about 5 times.
Luckily I bought a little check valve and had it on standby. It plugs into the inlet of the filter of the Quadrajet. Though it does restrict fuel flow but hopefully that isn't a issue for a stock-ish truck engine.
Though my understand is this should have correct any flow back: "removed the clip on the needle/seat to let it set when fuel is not flowing to prevent backflow". I that the case, then the check valve will not make a difference when I start her up tomorrow morning. So that begs the question, where is the fuel going (if that is actually the problem, no fuel in the bowl).
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