Hey, Just run a carter 4070 electric pump at the tank, and still use the factory fuel pump. I have used this set up for 30 years racing and in a 79 Power wagon for plowing. Works beautifully! The factory fuel pump acts like regulator kind of sort of....but the 4070 Carter doesn't need a regulator. I have same loss of fuel issue on my 87 Dodge W-150 with 440 in it and old school AVS. The hot motors evaporate the crappy gas.
What a joke.