[danc30]

I have -8an feed and return lines, a Holley HP-150 electric pump and a Mallory return style regulator.

When I first turn the pump on, with or without the engine running, I have a steady 6psi of fuel pressure at the carb and the pump and regulator make a steady "sound".

After about 5 or 10 minutes, the fuel pressure surges up to 7 and down to 5 and back again about every 3-4 seconds. The fuel pump sounds like it's surging, (different noise and pitch) and the regulator makes a different sound.

I am guessing that the pump is bad causing it to surge and the regulator is sounding different due to the surges from the pump and making the adjustments to the change in pressure from the pump.

Anyone know what I should try in order to figure out if it is the pump or regulator?

(The fuel filters are clean, the tank is full, and it happens whether the engine is running or not running)

Any help is appreciated.
Dan