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

flathead31coupe said

So just take the return out of the loop and run it without a return. Is that correct

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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.