Engine/Transmission (1998.5 - 2002) Poll - Lift Pump Problems on your 24V?

[Steve St.Laurent]

Posm - I agree that our polls would tend to be biased towards those that had a problem usually, except this time we have an older poll to compare to. Here's the link to the original poll - https://www.turbodieselregister.com/forums/showthread.php?s=&threadid=19171 . At that time (June of 2001, less than a year ago) only 25. 9% reported they had reported having had a bad lift pump, and 74. 1% reported no problems - with 116 responding to the poll. On this poll even if you add the people that haven't checked their pressures and to the no problem pile you still have 47. 8% of the people having had a bad lift pump and 52. 2% not - out of 161 responding. VERY interesting comparison. My guess is that more people are informed enough from the site to have put a pressure gauge on their truck to check pressures since you can't tell that you've got a weak lift pump until it's almost completely failed. We have no way of knowing on the first poll how many had checked their pressures or not. What the results are telling me is that they back up my assertion that it's absolutely mandatory to have a fuel pressure gauge on your 24v truck if you want to protect your VP44.



-Steve

 

[Steve St.Laurent]

TTT - it's up to 59. 6% of those that have checked fuel pressures having a bad lift pump and replacing it, 48. 6% if you include the 32 guys that haven't checked their pressures and are assuming their pump is good.

 

[mopars1]

Amianthus, about the VP44 pump failing I think it is just luck of the draw with the clearances in the pump being a little tight or a little loose. I have seen trucks come in with NO lift pump pressure that had been running that way for quite some time. The injection pump never failed. I have also seen injection pumps go out very quickly after the lift pump pressure went away. You just never know. That is the problem.



Steve, I just had my lift pump replaced at 20,000 miles. No problem with performance, just hitting 5psi at wot. It had been doing this for about a month and I didn't want the pump to take a crap when I was on a trip. I think that if all the trucks had gauges installed the poll would be at least 80% to 20% for replacements. Without knowing the pressures can bite you some time in the future and usually will be in an unfortunate time or place.

 

[Pit Bull]

Just wondering? Is the latest version of the lift pump any more dependable than the earlier ones? What is the latest pump # from Dodge?

 

[mopars1]

Latest DC pump part number

The part number on all the pumps we have gotten in over the last few months is 5080885AA. That is the one installed on my truck a few days ago. When you see other numbers posted here for the lift pump you have to remember most of them are Cummins part numbers.

 

[LEEH]

24000 miles - so far no problem. I wonder, is their a direct relationship to early demise of the lift pumps and bombing, no matter how slight? Seems to me when reading the posts that many if not most of those people that have lift pump failures have been running injectors and/or black boxes. May want to modify your poll to reflect lift pump failures with and without mods.

 

[Ted Constantine]

Well I voted no failure a couple days ago but it turns out the pump is getting replaced monday. It is the original pump with 36-37k (clock vs tire size) is idleing at 9. 5-10 psi and when my foot is on the floor I get a little stumble.



275s & ez since 10k

comp for a month or so

 

[MikeR]

Originally posted by LEE H

I wonder, is their a direct relationship to early demise of the lift pumps and bombing, no matter how slight

Lee,

It does not matter wether you are stock or modfied. I find just as many failures on stock trucks as modified ones, and the same % has been reported here on the TDR.

 

[RATTLINRAM]

As I have said on another thread, I just installed a Westach FP gauge, with the sender reading between the filter and the VP-44 using the inner-most plug on my 99's filter top. I also screwed a small mechanical gauge into the other plugged port which I assume is pre-filter (coming from the lift pump) My readings are as follows.



Mech = 12-13 psi @ idle

Elect = 10 psi @ idle



Mech = ?? @ WOT ,,,, (I should have put a hose on it to veiw! )

Elect = 5-6 psi @ WOT



Filter is due for a change, but I wanted to see how it compares to reading with new filter. I will do filter change this weekend.

I did stop by a dealer and talk to their diesel mechanic who said 10-12 psi sounds about right for idle, but also said DC doesn't have a spec for WOT

My truck has 39,000 miles on it, so is the lift pump covered by the 100k mile engine warranty or the 36k,which has run out.

 

[mopars1]

Rattlinram, the pump is covered by the 100,000 mile 5 year warranty that comes with the engine. Don't let a dealer tell you otherwise. I have checked many times through the DIAL Computer just to make sure and it always tells me the replacement is covered as long as the truck is not 5 years old or over 100,000 miles.

 

[Steve St.Laurent]

Rattlin the WOT spec at 8 psi is very new information and is from the STAR hotline. 90% of the mechanics out there probably don't know about it yet.

 

[RATTLINRAM]

Thanks Fellas,



mopars1,

I'm sure glad to hear about the warranty coverage, and I'm going to check with the dealer after I've had a chance to double-check my gauge accuracy with a clean filter.



Steve,

I noticed that I was only reading 8-9psi @ 70 mph on my way home from work today. Tomarrow, I'll change the filter and remove the mechanical guage from the pre-filter port, add enough hose in order to tape it to the windshield so I can compare the two.



And if I still see anything under 8 psi, Then I should start making some noise at the dealer,,,,,,,,,,,,,#@$%!

Right?,,,,,,,

 

[mopars1]

Rattlinram,

Yes, go to the dealer and tell them you have low power and checked the lift pump pressure at wot and it is under 8psi. If they tell you it still has enough pressure and won't hurt anything, have them call the STAR Hotline and tell the Diesel Tech at the Hotline what the pressure is and let him tell the dealer to replace the pump. And don't let them tell you the pumps are on restriction because THEY ARE NOT on restriction as of 2 months ago. Good luck and keep your cool, that will make the visit a little more pleasant if you get any flack. I just don't understand some of the people at the dealers not wanting to help unless they are ill informed and just don't want to make a phone call to get the latest information. We probably put on an average of three pumps a week and most of the trucks don't have any mods whatsoever. Too bad you don't live close by. You could get the pump replaced asap through the dealer I work for.

 

[EricBu12]

I just got done last week putting in a Pusher pump of 7-8 psi 100 gph pump and a replacement lift pump from enterprise at 15 psi and 100 gph. . Now I got 14 psi idle, 10-12 cruising and it slowly goes down to 7 psi at WOT but holds there at 3000 rpm. I'd say I have a good system going now... .



Pic below is the filter with a heater and water in fuel sensor going to the 7psi pump. pump is less than 2 feet from top of tank.

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[danandamy]

Say Steve........

You left a catagory off the poll:

"I have a 12v and don't have to worry about it"







dan

 

[redneckdr]

pump problems

how do i respond to the poll? i would have answered no problems 'til i read the thread. 13 at idle, 11 at cruise, and 5 at WFO. guess, i belong in the problems early?? oh well, trip to the dealer in the future.

 

[Pit Bull]

Re: pump problems

Originally posted by redneckdr

how do i respond to the poll? i would have answered no problems 'til i read the thread. 13 at idle, 11 at cruise, and 5 at WFO. guess, i belong in the problems early?? oh well, trip to the dealer in the future.

I guess I missed something?? What are the reading suppose to be if you have a good pump? What are the readings if you have a problem? What does DC use as the number for when they will replace the lift pump? If someone could provide these numbers with the TSB reference, I will print them off and keep them in the truck so their will be no misunderstanding with the Dealer.

 

[redneckdr]

pressures

pit bull, steve has just posted the 8 PSI at WFO* as minimum. i'm running 5 or a little less at WFO.





















(*WOT)

 

[Ted Constantine]

Just got a new pump installed this morning under warranty. 19spi at idleOo.



Ted

 

[stephen bolger]

Ted Constantine what pump are you useing and what is the part number.