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

[Steve St.Laurent]

BigDaddy dug up an old poll on lift pump failures ( https://www.turbodieselregister.com/forums/showthread.php?s=&threadid=19171 ). I tried to post the results from that poll and then reset it to get current and more realistic numbers but there was no way to reset the poll. So here is the poll over again. To keep this poll honest, if you have not checked your lift pump pressures please only vote on the last 2 choices (haven't checked my pressures - truck still running fine < 50k or haven't checked my pressures - truck still running fine > 50k). So ONLY answer the first 8 questions if you have checked your pressures with a gauge. The reason for that is many people don't think they have a weak or dying lift pump but once a gauge is put on the truck find out otherwise. Keep in mind that D/C's spec for lift pumps is now 8 psi at WOT under any condition.

 

[BigDaddy]

Steve,



Nice work It will be interesting to see the results.

 

[LSMITH]

93K miles with the original pump and it is still going strong. I keep a close eye on it with all the others that are failing though.

 

[Larry Willard]

My first one was replaced at just under 25000 miles, although it was bad for at least 6000 before that. After the local dealer said nothing was wrong with it since it still ran I figured let it take out the VP 44 and let them replace it all under warranty. Then I decided to go ahead and take care of it. That pump lasted less than 10000 miles. The last one now has 6 or 7 thousand miles and still idles at 13 and drops to 5 at WOt. I have a carter helper/pusher sitting here waiting to go in.

Larry

 

[EODDEWEY]

I had to have four (4) lift pumps and the fuel pump replaced over a period of 9 days. One in Corsicana, Texas, one in Conroe, Texas, and two in Houston, plus a new fuel pump which I had to call DC to get the dealer to replace. They finally found a short in the wiring for the lift pump. Sure ruined my Thanksgiving vacation.

 

[Archive]

Lift pump poll

Steve, Just a thought... . I wonder how many of us without fuel pressure gauges will answer "no problems" in error.



I think mine's fine, but from everything I've read, I can't really know for sure... . right?

 

[jtisdale]

p!$$ poor pumps...

The other day I was at the dealer and within a couple of hours, two trucks came in with bad pumps.

 

[Bigsaint]

Well, I thought I held the title with four pumps in less than 15,000 miles ( in all fairness, 3 were aftermarket pumps). Then I read EODDEWEY's reply :--) .



Scott W.

 

[otis]

Are the 2002 models having this problem?I just ordered one and would hope DC fixed this problem.

 

[Rogue Ram]

Here's a stupid question..........

... ... ... . do the 12valve rigs have lift pumps? Wouldn't they have to have one? If so, why don't theirs grenade--- ????



Rogue

 

[Steve St.Laurent]

d. miner - that's the whole reason I put the last two options on there. It will be up to the reader to decide whether those that reply with the last two responses (haven't checked my pressures) mean a bad lift pump or not. My opinion is that those responses should be discounted completely because those respondents don't know whether their pump is good or not - but by giving those options it at least lets the readers decide whether or not to include those responses. JMHO



-Steve

 

[BigDaddy]

Otis,



As far as I know they use the same Carter pump



It is my speculation, based on what I have seen with my truck, that the pump just can not handle any additional fueling over stock or an EZ/VA box.

 

[Pit Bull]

Originally posted by Steve St. Laurent



. My opinion is that those responses should be discounted completely because those respondents don't know whether their pump is good or not - but by giving those options it at least lets the readers decide whether or not to include those responses. JMHO



-Steve

Steve, I think you are missing one of the most important data points. Of the members that respond that they have had failed lift pumps, how many of these trucks have had fueling modifications? From reading many of the lift pump failure threads it seems that modified trucks suffer multiple pump failures and most of the reported failures are on modified trucks. I am not saying that is the whole reason for the failures ( I know some members have had failures with unmodified trucks) but I am sure it does not help a marginal pump design to require it to deliver more fuel then "normal". Why not do a poll of modified truck failures and stock truck failures?

 

[Bigsaint]

Rogue, the 12'ers have mechanical lift pumps, whole different set up than ours.



Scott W.

 

[Briar Hopper]

It looks like a pump, it smells like a pump..... but it ain't a pump! The pump for my inflatable air mattress would last longer in this application... .

PitBull, my original lift pump was dead before I got gauges on and started BOMBing. The truck isn't driven hard 100% of the time, now, so I don't really feel that fueling modifications contribute a whole lot to the failures of these fake pumps. The fourth and latest fake pump I have on there now, is still sweating away to give a good accounting of itself, after 15,000 miles.....

 

[tragicwagon]

Steve,since lift pump failures can sometimes lead to injection pump failures how about starting a poll on that,although not many failures are reported it would be nice to have an idea.



My truck goes in tomorrow for a new lift pump,its not dead but very low pressure,glad I got the gauges in!







PS,how hard would it be to install a 12 valve mech pump,how much pressure do they run,the mounting hole is already cast into our blocks but I dont know if the cam has a lobe to run it,maybe something to investigate.

 

[Steve St.Laurent]

tragicwagon - Anyone can start a poll, go ahead and start one - but I don't think you'll get that much data on that. On the 12v pump it produces a LOT more fuel pressure than the 24v injection pump can handle (in the 40 psi+ range) and the cam in the 24v engines doesn't have the lobe on it to drive the mechanical pump. The hole is still there in the block so you could change out the cam for a 12v cam and drive the mechanical pump, you'd just have to come up with a regulator setup to reduce the pressures to usable #'s. IMO you'd be spending a ton of money where there are better options out there.



-Steve

 

[tragicwagon]

oh well just a thought.

 

[Mopar-muscle]

pit bull , the fueling mods have nothing to do with it , the pump is 6 to 9 feet TOO FAR from the fuel source . thats the problem .

 

[Posm]

I think those that blame the failures on BOMBS are just rationalizing so they do not want to put on guages or worry about their own $35K truck. I went through 2 pumps before 80K and before I installed my EZ. I have #4 under the back seat and plan on putting it on when needed. The argument over whether the pump is bad or the placement is bad is irrelevant. The "system" is bad and DC should come up with a fix. Our polls will be biased towards those that have had the problem and will click on the topic, but over 50% failures on an emisions part is unbelievable.