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

flathead31coupe said

i put a gauge on the side of the regulator i took a plug out

I took the plug out of the regulator on the side and put a gauge there. It showed 5 lb. The same as the other two gauges I already have on the car

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Ok, so you are saying you have 5 psi in the line from the pump to the regulator? If that’s correct you need to figure out why that is. That system will not work with that pressure to the regulator.

So the bypass in the pump may be stuck half open or you have issues with the vanes in the pump.

You need to sort out the low pressure in the feed line before you do anything else.