[aumoore]

I had a similar problem with my holley blue pump holding steady pressure. It would be at 7psi then it would get erratic and sometimes dropped to zero. I noticed that the sound of the pump would change with the pressure changes. I started looking at how the fuel line was run from the fuel tank to the pump.

Here is what I found: the fuel tank had a ridgid aluminum pickup tube extending out of the tank about 5" and I had attached a braded line that looped up another 5" or so before it started down to the Fram canister fuel filter which was mounted just below the top of the fuel tank. I had mounted the fuel pump as low as possible and it was below the fuel filter. These electric fuel pumps make great pushers but are horrible at creating suction so they need some gravity feed and with my fuel line routing there was no gravity feed so the fuel would cavitate with air. This make the pump very loud(it is still loud but at least I know it is working) and hot as the fuel acts as a cooling agent for the pump.

I corrected by cutting the pickup tube so it only extended up about 1" then eliminated the loop up in the braded line by making a 90 degree turn(do not kink the hose) straight forward to the fuel filter. Now the pump keeps steady pressure and is a little less noisey.

Hope this helps.