PatsLs1vette

My factory pump in my 04 was dieing so I got a racetronix pump fpa-006 for late c5-c6 vettes good for up to 650 rwhp.After iinstalled it I noticed it doesn't hold pressure with key on goes up then goes back down to 0.So I thought maybe I put a hole in the new plastic tube and it was draining back .Pulled it back out and replaced it with submersible gates hose and put it back in and same thing.I filled it up and took it for a ride today and holds great pressure but key on engine off it drops back to 0.Just trying to find out if its normal for these pumps.Starts fine and I couldn't only get on it lightly with the rain but holds steady.

DRIVER456

I think the stock pumps had a check valve so fuel wouldn't drain back and hold pressure.The racetronix pump might not have a check valve.

PatsLs1vette

That's what I was thinking also thanks.