Yep if it drops right to zero it sounds like the pump as a leaking inj wont usually drop that fast. And since its a returnless system it would be the valve in the pump. I remember some year intrepids had a plate in the trunk you could remove to get the pump out. I dont think your 300 has that so you will have to drop the tank some. Ron

Last edited by 383man; 09/18/12 12:00 AM.