[FWB]

jeff,
is your pump even rated for EFI? you said a holley inline pump, like the above post the fuel pressure has to be high enough or the injectors will just dribble. also i remember the ford EFI in stock trim used a return line to keep the tank from being reverse pressurized.

i had the reverse going on, i was using a tank from an EFI car but using a carb. the pump would get noisy half way down the track and fall flat on its face from running out of fuel. as the pump sucked the fuel out it required more and more pressure to get the volume because i wasn't replacing the volume of fuel removed with air. in essence i was collapsing the tank, or trying to, with the fuel pump