Thread:

Fuel system question?

Did it work before putting the Holley on?
Or is this problem the reason you put a new pump on?
My Holley blue is 5 years old, is mounted low on a stringer, pulls from both tanks, and will fill the lines and build 6 PSI in a matter of seconds.

I also feel that more is made out of mounting them low than is really true, but it is certainly not something to be ignored. A dry fuel pump is a hot fuel pump, and that means certain failure.
That is my main thought in mounting them low.
It is possible that you have leaks in the pick up's near the top of the tanks, but seems unlikely iif it does it even with tanks isolated?
It may not be the complete cure, but lowering it seems to me to be the first step.