Need Help : Ricks tank need Check Valve for EFI???

[64pontiac]

Ok I have a Rick's EFI Camaro tank, and we have been having some start up issues that I need to address now that spring is coming. This system doesnt hold pressure, it drains back to tank after the key is shut off. This is probably the cause of my hard starts?

I know I installed an Aeromotive in tank 340 and it had a little needle/seat in the outlet. Whatever pump is in this tank obviously does not have that?