I have a 65 fastback that I transplanted a 91 EFI 5.0 HO in, put in a Holley EFI tank and pump. I ran the fuel lines straight from the tank to the stock fuel rail. If it sits for a few hours it looses fuel pressure and won't start. I shoot a little starter fluid and it starts right up. I can drive it all day and it starts fine. let it sit for over 3 hours and no go. Good filter, good pressure, replaced the fuel regulator and that didn't do anything. When I turn the ignition key on and the pump comes on, it continuously runs and doesn't shut off, like it's not building up pressure and shutting off by itself. should I have something in the supply line in addition to the fuel filter?