hey guys i just installed an isspro fp gauge from vulcan and followed the instructions and i am getting only 9psi at idle and drops to 2psi at WOT BUT i had it checked 2 weeks ago with a gauge and it was 12idle and 8 WOT the only thing i can think is at the gauge the little compression fitting thing {looks like a metal sleeve that goes b/t the two ends} is pinching the line at the gauge. just about half of the plastic line is pinched...maybe that is my problem but please help thanks!!!!

 

humm, even pinched at idle it should level off to the corect pressure. im guessing this is post fillter, if you got a bad tank of diesel then that could of cloged up your fillter... thats my best guess right now.

 

well i put it at the schrader valve on the injection pump and i even filled it up with new diesel so i think im gunna try a new carter lift pump my buddy works at a truck shop and can get it for $47.00 so its worth a try then i will be able to elimanate that. but thanks for all the help