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Topic: Check engine light -- Fuel delivery pressure (Read 303 times) previous topic - next topic

Check engine light -- Fuel delivery pressure

About 10 days ago on our way home from Branson, I got a check engine light.  I was only about 7 miles from home.  The light and dinger came on as I was transitioning on a ramp from one 4-lane highway to another.  Seemed to happen each time as I eased off the throttle.  Only last 5-10 seconds.

Happened another 5-10 times on the way home including the last 3 miles on city/neighborhood streets.

VMSpc says:

SRC    ENG
TYPE  SPN
ID        94 
MD      10
Fuel Delivery Pressure Abnormal Change

and

SRC    ENG
TYPE  PID
ID        94 
MD      42
Fuel Delivery Pressure Abnormal Change

It had been about 7900 miles since I changed the oil and fuel filters (longer than I usually go).  Since I got home, I've done a LOF(s) change.  I found no water or other noticeable contamination.  I then took it out for about a 6 mile drive to dump the tanks including 15 minutes of idling at the dump station.  No recurrence of the problem.  I do plan to take it out (10-15 miles) in the next couple of weeks to fill the fuel tank for the winter. 

Take a look in your crystal balls and tell me if you think I fixed the problem or there is something else lurking out there.

Thanks,

Rich


Rich and Peggy Bowman
2002 U270 3610 WTFS, build #5939--"Freedom"
2022 Jeep Grand Cherokee Summit 4xe
SMI AirForceOne brake system
PakCanoe 15

Re: Check engine light -- Fuel delivery pressure

Reply #1 –
#1 Fuel filters #2 Lift pump  Mileage on filters is not a good indicator of their condition. One stop for fuel can introduce algae, etc and clog a filter. Do you have a sight glass on your primary fuel fliter? It's the one a little on the right when you open the engine door as I remember after looking at Cummins engines of about this year.  I dealing with about 100 filter clogging episodes on customer cars back in the 1970's, '80s, the contamination may settle after a long stop or overnight and take a few miles to rear it's ugly head again.

Another possibility is a higher percentage of biodiesel at your last fill may have loosened junk in the fuel lines. Usually clogs the secondary filter first as the micron numeber is lower (finer) but both can easily clog.

Pierce
Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)

Re: Check engine light -- Fuel delivery pressure

Reply #2 –
The plastic bowel all looked clean, no water or contaminates.  Haven't seen any leaks around the lift pump.  I thought it was only a factor at initial startup although it could be leaking air into the system.

Rich
Rich and Peggy Bowman
2002 U270 3610 WTFS, build #5939--"Freedom"
2022 Jeep Grand Cherokee Summit 4xe
SMI AirForceOne brake system
PakCanoe 15
 

Re: Check engine light -- Fuel delivery pressure

Reply #3 –
Quote from: Rich Bowman –
The plastic bowel all looked clean, no water or contaminates.  Haven't seen any leaks around the lift pump.  I thought it was only a factor at initial startup although it could be leaking air into the system.

Rich

Yup, the bolded part is the issue, as well as leaking fuel.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020