I have a small block 427 from Blue Print engines with a Holly Sniper EFI. When I ordered my MK4 kit from FF i told them I was going with an EFI system on my motor. They sold me all the parts for the system. Fuel pump, filter, and regulator. Assembly went well car completed a year ago. Have driven 1600 trouble free miles since. When I turn the ignition key on I can hear the fuel pump run and the engine starts right up. Now when I shut the engine down after bringing it up to temp and turn the engine off if I wait more that 1 minute, I have timed this numerous times, the fuel pump will not come on and, of course, the engine won't start. Sometimes after 20 or 30 minutes the fuel pump will come on, but sometimes I have to wait 24 hours.
Installed new fuel pump relay, no change in this behavior. Once the engine is running I can drive for hours with no failure until I shut down.

I'm stumped.