Just Guessin here Rich but if the electric isnt workin would it is resricting the fuel flow ???..
On my 350 I have the mechanical fuel pump and heres my set-up.
Fuel Cell in the tool box ...fuel pick up is 2ft.+ higher than the fuel pump...check out my photo bucket picks.
it draws the fuel outta the fuel cell in a HURRY...NP's gettin fuel to flow to the pump at all.
I would think removin one or the other will cure your problem.
I see no need for BOTH.
Just my 2 pennies.
Tim


1952 Chevy Shortbed

Photos in Photobucket

If It Aint Broke Fix It Till It Is!