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

Rat Bastid said

Yes. If it still doesn’t have any pressure it’s most likely the pump. I looked at that regulator again and I’m not sure there is any way it could drop the fuel pressure like that. The first suspect is the pump IMO.

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Just for kicks, I took the regulator apart. The four bolts left it up. There is a spring and a rubber diaphragm with a metal tapered piece underneath and then I can see the fitting for the return. So the diaphragm is all that's in there in a spring so I'm pretty sure that's not the issue. I will let you know when I get off work and try to deadhead. Thanks!