FRP

08lmm72mm

Member
May 13, 2019
43
2
8
Saskatchewan, Canada
Weak cp3, possible bad injectors, collapsing fuel lines, plugged fuel filter, sticking FPR is a few causes to that issue. Best bet is to fill out a signature about your truck what been done to it ect and use the search function. This has been discussed plenty lots of great answers on where to start.
 

Nickvanluven1987

New member
Jun 10, 2021
8
0
1
Stillwater Oklahoma
Weak cp3, possible bad injectors, collapsing fuel lines, plugged fuel filter, sticking FPR is a few causes to that issue. Best bet is to fill out a signature about your truck what been done to it ect and use the search function. This has been discussed plenty lots of great answers on where to start.
Where is I good place for a reliable cp3
 

2004LB7

Well-known member
Dec 15, 2010
3,268
187
63
Norcal
Lincoln diesel. But don't condemn it just yet. It may be something simple like one of the rubber fuel lines or filter
 

JoshH

Daggum farm truck
Staff member
Vendor/Sponsor
Feb 14, 2007
13,132
115
63
Texas!!!
Don't throw parts at it; take the time to properly diagnose it. You will not only save money but also learn more about the truck and how it works in the process. There are a number of things that can cause low rail pressure. What tests have you run so far to figure out the problem?
 

Nickvanluven1987

New member
Jun 10, 2021
8
0
1
Stillwater Oklahoma
Don't throw parts at it; take the time to properly diagnose it. You will not only save money but also learn more about the truck and how it works in the process. There are a number of things that can cause low rail pressure. What tests have you run so far to figure out the problem?
Aside from running scan tool and shutting down each injector to see if they are working and also checked return fuel for 15 seconds of crank time and got 110ml return .. tuner gauges show a lot of info and more then I know about lol..
 

2004LB7

Well-known member
Dec 15, 2010
3,268
187
63
Norcal
Still too high. Need to test each bank, CP3 and relief separately to see where the issue is
 

2004LB7

Well-known member
Dec 15, 2010
3,268
187
63
Norcal
Yes. Pull the return side of the CP3 off and put it in a bottle. Plug where the line went to keep the return fuel from the injectors from spilling out
 

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