fuel pump

fuel pump

2001 5.9 H.O. Cummins fuel pressure test

9h ago
SOURCE  

Description

Upgraded to an Airdog raptor 100 pump with 1/2" tank straw. Supposedly preset at 15-17 psi, but wasn't getting the power or mpg as expected... Decided to put an injection fuel pressure test on the Schrader connection on the injection pump. (HF fuel tester, but had good reviews across the board on accuracy) Was originally set at 12 psi from airdog, bumped it up to 16 psi idle, and as you can see, has a good 7 psi sweep. After the video, I upped it to around 17.5 psi just to stay above 11 psi at WOT without over pressuring the pump at idle. Even with this pressure change, can tell a big difference at WOT just above 2000 rpms, and mpg is back to where it belongs. I would recommend pressure testing before driving any aftermarket pump.