So after looking at mine, they spliced a fuel filter before the pump, and there's some janky stuff going on up to the Rochester 2GV. I see I'm going to be learning that bending and flare tool sooner rather than later.
A couple of things.........an everyday filter before the pump may introduce too much restriction, as the pump is doing "it's best" under vacuum to start with. There are (exist) special low restriction filters designed for suction side use
The other thing, is that you may have a lot of "crap" in the tank/ feed line that is causing the trouble, and the previous owner put a filter there to try and stop it.
