Cummins Fuel Trouble???

[DLDJR]

I am having spuratic trouble with my 95 Dodge Cummins 155,000 miles. It will run just fine for 1hr, then three hours, then 5 minutes.
While driving the engines sounds like it is starved for fuel, then when you let off the throttle the engine rpm suddenly increases then dies. Wait a minute it will start back up and run fine for an undetermined amount of time until it happens again.
I have removed the fuel tank and checked the pickup screen, installed new filters, new lift pump, new fuel shutoff relay.

Please help.
I was thinking that the shut off silinoid might be weak and unable to hold open.

[lbeenken]

Have the injection pump tested.

[PSiemens]

At what fuel tank level does this happen? Does it give action only at 1/2 a tank of fuel or less? If so then there is a hole in the fuel pickup area in the tank.
Next time the truck dies, open the hood and see if you can move the plunger (Located on the bottom of the shutdown solenoid) upward any amount. If so, then the solenoid is getting weak.
Before changing out the inj pump, try this. Remove fuel filter and discard. Fill a new filter with Stanadyne fuel additive. Get it as full as you can. Start and run the engine for 3 or 4 minutes. You want that Stanadyne to get into the pump where it will do the most good. Shut off engine and let it sit overnight. If there are any stuck or frozen parts in the inj pump, they will be free now. This works and is perfectly safe.

Phil

[smokeymountain1]

I had the same problem with mine and found out it was the injection pump

2001 Dodge Ram 2500 4X4

[DLDJR]

Thanks for the reply; I have the fuel tank completely removed now. Still have the same trouble pulling from a 5 gallon can. When the engine reaches operating temp, it dies. Wait about 30 seconds, you can hear a click inside the injection pump. The engine will start right back up then die in 15-30 seconds. If I let the engine cool down compleatly, it will start back up and run untill it reaches operating temp, about 20 minutes, then it dies again.
I am going to try the fuel treatment trick and hope that that will work.

Thanks again

Don

[smokeymountain1]

Hi again,I hope Iam wrong,but Ithink it is your injection pump.
Art.

[PSiemens]

My truck is a 95 Cummins with over 400 thou on it. I've had the inj pump stick one time. The Stanadyne cured it, but your problem sounds a lot worse than mine. Do you use additive regularly as 155 thou is not a lot of miles for the P7100. I removed my pump once to do a KDP repair. If the pump has to be changed, are you going to do it yorself? Do you use additive regularly?
Phil

[cschulz]

Injection pump.

[DLDJR]

Thanks for all of the help. It was the injection pump. She purrs like a lion now. Next problem. I changed the pump, and the truck runs great, but when it sits at idle for a while and also at startup it smokes like crazy. It sound like it's loaded up. Drive off and it runs just fine. Too rich????

[smokeymountain1]

when the truck is at idle does it seem like there is a miss in the engine



2001 dodge ram

[DLDJR]

No it idles fine, when you give it throttle is misses a little then cleans out.

[cschulz]

Sounds like an injector or two leaking. Pull them and have them tested.

[seth dulac]

i have a 98 ctd 24 valve ran fine shut it off and it will not start turns over but will not fire. i can't figure it out i put the heater under her pulled the filter cracked the injecter lines everything is ok. i am stuck

[DLDJR]

Yes it does sound like its running on 4 cyl.