S14 fuel pressure loss?

[oomgloff2]

I have a fresh well runnin SR swap but when the car sits it has real slow fuel pressure loss and the gauge I put on the line drops to zero overnight. Has a new walbro, swapped with my roomates workin pump and it does the same thing. it has a new filter, put a nismo FPR and a gauge (to eliminate any fpr problem) in the line and the pressure is fine when it runs. only thing I can think of is if there is some sort of valving in the line where the fuel goes into the tank? or an injector, though it runs fine and there is no fuel leaking anywhere... dunno, anyone experience this?

[Infinitiguy19]

Is it hard to start when the pressure is fine?

Check the Injector O-rings.