Fuel pressure dropping while driving and under acceleration to zero at idle runs 4 lb electric Blue

Just an update. Haven't worked with the Mallory fuel pump yet, but the fuel pump in question the new Holly blue. I hooked it back up with the filters to my existing lines and ran it from the regulator to a gas can and it barely trickled out so.... Along with deadhead the regulator and it not making very much pressure. It definitely don't have enough flow. So as soon as I can I'll try the Mallory out. Hopefully that'll fix it