First things first. I’d like to thank everyone that contributes on this site! The knowledge has helped me overcome and save a lot of money with fixing my truck myself. Thanks everyone. I have a 07 Pete 379 with a Cummins 475 ISX (no def system). Got the truck a few months ago and has been running great. I noticed every now and again mainly when climbing hills my check engine light would come on then cut off immediately. When it came on, my boost gauge went from 20 psi up to 30-35 then back down to 20 psi when the light cut off. Now, the light is staying on and I’ve lost a lot of power. The truck almost crawls even when on flat terrain. I replaced the boost sensor that comes off the manifold thinking that was the issue but no. I just got a new fuel filter hoping that will fix something. I ran the diagnostic test and got 482 low fuel pressure. I’m trying to avoid taking the truck to the dealer if I can fix it myself. Any ideas? I check the fuel lines and saw no leaks or damage. Also noticed now that check engine light stays on I’m seeing white/black smoke coming out of stacks. I’m hoping it’s not the turbo but who knows. Any help would be great. Thanks drivers!
07 Cummins 475 ISX no DEF SYSTEM low fuel pressure issue.
Ontario Outlaw
Hozer Witta Hood
I’d at least start with Powerspec and Quickserve. If you can Insite is better. Grab a scan tool off Ebay. I paid $300 for mine, Inline 5.
Then you can use their diagnostic trees to start tracing the problem.
Google Rawze and emissions tuneup.
I’d also want to check what .Cal file is on the ECM.
Then you can use their diagnostic trees to start tracing the problem.
Google Rawze and emissions tuneup.
I’d also want to check what .Cal file is on the ECM.
r3gulator3
IMA KEEP IT REDNECK
Ok. 3 things cause this issue. 1 plugged fuel filters, 2 the pressure relief valve in the back of the head bypassing fuel, and 3 injectors or fuel transfer tubes leaking past into the return. If it’s been a while since you changed filters I would start there and drive it. See what happens.
mndriver
curmudgeon extraordinare
An 07 is past due for new fuel lines. Almost working on a second set.
I'd also test the CAC for any leaks too.
There's a guy that makes a slick tester for Detroit's that also works on Cummins engines.
Attaches directly to the pipe connected to the turbo.
Regulator let's you put 45 psi to the system to find any boost leak
I'd also test the CAC for any leaks too.
There's a guy that makes a slick tester for Detroit's that also works on Cummins engines.
Attaches directly to the pipe connected to the turbo.
Regulator let's you put 45 psi to the system to find any boost leak
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