Fuel pressure surging

[danc30]

I replaced the return regulator with a dead head and it fixed the problem. Now I know what was causing it. It was a bypass regulator trying to work with an internally bypassed pump. These 2 don't work well together. I am still deciding whether to replace the pump with a non-internal-bypass one or stick with the dead head.

The pump I have is run through a relay within 12" of the pump, I have about 4 feet total of braided line between the tank and pump and at the front transitioning from the alum. line to the filter regulator in the engine compartment. I have 1/2" aluminum line from the pump to the front of the car as well as from the regulator to the tank as a return line.

Jerry,
I just want the electric. Also there isn't much room for a mechanical in my engine compartment.

Undy,
You say the black pump is externally regulated. Does this mean I can shim it so it doesn't regulate at all so my regulator in the engine compartment does all the regulating/bypassing?

Thanks for all the help.