Engine/Transmission (1998.5 - 2002) VP44 failure poll

[Pit Bull]

Originally posted by jmadden

here's the feedback I got from Cummins following my VP & LP failures...



"On ISB engines, the lift pump does not start operating with the key switch on until the engine is bump cranked.

Then it starts working for 30 seconds and then shuts down by itself. During 30 seconds of running, it primes the

fuel system. Pressure during this running period should be around 13 to 15psi and during cranking, the pressure

should not drop down more than 8psi. We have seen in the past that even if the pressure are found to be within

specs, priming pumps due to internal check valve and excessively worn out pump impellers, that it creates fuel

spikes which create and pump air into the fuel system, which leads to the major problem in the VP44. There is

no fool proof methods to check the internal condition of the priming pump or to check air created by the priming

pump. "



So what do you all think about that?



jm

I think they just said that FP gauges don't help save the VP-44 but it can tell you if your LP is dead. Also sounds like the air in the line is what hurts the VP44 the most. Sounds like your most valuable part of the CTD is the 100K miles warranty. Go figure

 

[Agades]

replaced VP and didnt need to



make sure you get a real good diagnosis b4 spending da loot

 

[isb360]

101k and still going strong although I am going to put in post-filter fuel pressure gauge to monitor the lift pump. I feel occasional surging in third gear, high rpm, WOT. If it's going to go on me, I want it to be before I boost power to give me a chance at having a partial warrantee coverage

 

[340Mark]

My truck had replacement on it when I got it by the PN#.

I replaced that one and the lift pump by 143K

 

[Heavy Metal]

114,000 miles and still on first injector pump. Original lift pump started getting weak two or three weeks ago and I immediately yanked it and installed the brand new spare that has been riding around in my tool box for the last 45,000 or so miles.



Bryan

 

[hammersley]

Mine hasn't failed as yet at 142,000

so I couldn't respond to the poll. I did have my lift pump replaced by the dealer at 97,000 as a courtesy prior to the warranty going out. In order to prevent this from happening I ordered the new new FASS system and it will be in will be in next week. This bypasses the lift pump and filter, and supplies an honest 12 lb all the time. This system is right off the big rigs and is being used in underground mines - it'll work for us. I ordered it with the new fuel line. Check page 101 of the new TDR Issue 41. Call Brad at 1-866-769-3747. And hey I don't work for them, or am not related... . just looks like this ends our problems... .

 

[jmadden]

c'mon... get me 100 votes! I know there is enough membership to do it!

 

[Big A]

I'm pretty sure I voted. I lost LP at 24,000 miles, and had to drive home several hundred miles. The truck never missed a beat. Dealer replaced LP, and later found 0216. Replaced VP about 1000 miles later. The truck never acted up. I caught the problem with my westach fp gauge. Is it possible that advance timing in these trucks is killing the VPs. I'm sure I lost my VP because of the number of miles I drove with a failed LP, but I notice a lot of people with failed VPs, have edge boxes.

Just a thought.

Big A

 

[stephen bolger]

My Pump Died At 70000km on the first one. The replacement started going at around13000km and bite the dust at 170000 just after the engine warranty was done. I replaced it with a cummins modified one and no the truck runs better than new.