Welcome, my name is XXXXX XXXXX I will do my best to help you with your issue.
It sounds like your check valve is leaking by and letting the fuel drain back into the tank. I'd replace the check valve
If the pump works when you bleed the line then the pump should be handling the lift ok
I will replace the check valve today. I am also rechecking the lines for leaks.
The check valve is working. The fuel is in the line but, air is getting in some how. Checking lines for leaks again. Found a union that need to be tightened. We'll see if that was the problem. There was no fuel leaking from the line however.