Engine/Transmission (1998.5 - 2002) lift pump failure on regular cab trucks

[Pit Bull]

Just wondering if there have been many LP failures on regular cab trucks since the lift pump is closer to the fuel tank and close to the designed pumping distance? Post if you have a regular cab and let us know what your experience has been?

 

[bbowe]

I went through 1 at 75K, stock Engine. It pulled down to 2psi WOT for 2 years. I replaced it when I went EZ and DD3. #2 seems to be doing well 15K later.

 

[HeberRam]

Maybe post a poll?

Pit Bull, you might consider posting a poll, of the number of failures, by year and buy quad cab vs reg cab. You may have something there with the distance thing?



Steve

 

[jwinnie]

First one died at 26k, second one is going strong at 60k.

I agree with HerberRam, maybe a LP failure poll, long wheelbase vs. short.



John

 

[Cummins4Life]

Mine is limping along, but dead enough that it should be changed at 47K

 

[Ncostello]

The longer the distance the worse the performance true. However I think that the extra 24" or so of distance the fuel travels for quad cabs isn't what breaks the back of the lift pump. The system design as a whole is somewhat wrong and the extra distance makes a "bad" situation that much worse. It shouldn't put that much more of a strain on an already strained setup.



A poll has the potential to show that fewer regular cabs have failures but there will still be failures. More than there should be for any chassis configuration. This is just what I'm thinking and could be totally wrong.

 

[dflack]

33K and no problem

Nearing 33k over 3 yrs. and finally installed a FP gauge at the schrader. I'm running 13-15 psi at idle 11-12 routine driving and 10ish at WOT. Will be towing/roadtrip in June (4,000+ miles). Not sure if I plan on having a spare pump with me or not? comments?

 

[apkole]

Two replaced under warranty . . . the first at about 60k or so and the second just shy of 100k. Third pump is ok so far at 108k.

 

[tarussell]

My first one went out somewhere around the 20,000 mile mark. I replaced it and that one was bad right out of the box ( just a bad pump nothing to do with the truck ) but the third one has been doing great for 15,000 miles so far. Thomas

 

[rweis]

QC, LP @tank

16psi idle, 14 no load interstate, 12WOT, 13 towing 8kRV interstate, 12 WOT towing 8k RV.

I THINK (no tech data) that letting it push is the key and why I moved it to tank area. VERY pleased with relocated pump.

 

[MikeR]

A regular cab truck isn't much difference in length than a quad cab truck... were talking 3 to 4 inches.

It is still no where near the designed pumping length.

 

[Pit Bull]

Originally posted by MikeR

A regular cab truck isn't much difference in length than a quad cab truck... were talking 3 to 4 inches.

It is still no where near the designed pumping length.

MikeR, it's pretty significant - Wheelbase for my 3500 Regular cab 4x4 is 134. 7 inches, for a 3500 Quad cab 4x4 it is 154. 7. That additional 20 inches is between the engine and the fuel tank. I think with all of the other things working agains't these pumps that 20 inches can make a difference in long term performance. Like I said I think it can make a difference.



I think that 20 inches also shows up in how rigid the truck rides which also makes sense. I had a 2000 3500 Quad cab 4x4 and it seemed like the frame flexed more on it then on my 2002 3500 Regular cab.



DC should of done 2 things to the longer wheel base trucks. Put a stronger LP and a heavier frame. JMHO