You Should have a pod in the tank to prevent cavitation. Keeping it over 1/2 should eliminate that possibility. Where exactly are you hooked on at the choke? You could make up a simple light at the tank and run it somewhere visible in the car to monitor power. When it acts up if the light goes out its a power supply. If it stays on its the pump.
The tank has been topped off during testing. The fuel gauge is about as accurate as a blind, drunk man throwing a dart. On a stock 2-bbl 360, there's a blue wire that feeds power to what I can best describe as a circuit board that transfers power to the choke's element. I'm tapped into that power supply coming from the main engine harness, before the power gets to the choke's "circuit board". I'll add a picture later this evening if needed.
