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

HSDemon said

Am I seeing this photo correctly? You have the fuel lab regulator on top of a Holley regulator and the fuel lab one is feeding the Holley one?

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Yes I opened the Holley fuel regulator all the way up and I am just using it as a t for the supply fuel line to both carburetors. The Holly regulator does no regulating. It is straight flow through used as a t only