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

Thanks for all the info. I've been over a lot with the guys here and realize that the holley pumps do push better than pull. By me, eliminating the bypass and putting a gauge before the regulator has determined that both pumps are not putting out enough pressure . Even the one that I replaced the spring that should have boosted the pressure to 19 only went to 10 to me. That lets me know that those pumps are not working right. I will see what the Mallory 250 will do