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

flathead31coupe said

Anyone have thoughts or ideas? Should I take this fuel lab regulator part just to be sure or just get another pump? It can't be this hard lol

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Dead head the pump and see what it makes for pressure. The pump may be junk. I will say I’m not a fan of regulators that send the fuel in the side and return it out of the bottom.

But I’m not throwing the regulator under the bus yet.