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

I have an electric Holly blue fuel pump close to the tank with a hundred micron and a 10 micron stainless steel screen filters. Both are clear. Have been noticing when driving from stoplight to stoplight fuel pressure drops to nearly zero. When I let up and come to an idle it goes back up to 4 lb. 3/8 supply and return to the tank ideas welcome