Engine/Transmission (1998.5 - 2002) Need Lift Pump part #'s and Pressure Specs Quick.

[CRSmith]

Howdy,

Well the lift pump has given up. The dealer is a moron and basically said my autometer was crap and they checked the pressure to be 7-10 psi. They're full of it, because the fitting between the test port and braided hose still has residue on it like it was never touched for removal. Anyway, we're checking it together tomorrow at 8am. I need to know the DODGE part number and Cummins part number so I will be an educated consumer. Also, I need to know where they look for the fuel pressure spec in writing so I can tell them to look there if they say that zero psi is still ok. I've searched the threads and found nothing, unfortunately.

Thanks

 

[Huff N Puff]

The lift pump has two modes,cranking the ECM lowers the voltage,in that mode you should get 7psi,when its running the ECM supplies more power to the pump,the manual states at least 10psi. I just installed a 5015723AC {is the Mopar #} ,which the dealer warrantied for me,the readings are as follows:10psi when you bump the starter,between 14-15 when idling,I have a heavily modifiyed truck running it hard it dosn't drop below 8psi. Dont jump to conclusions yet about the dealer, until you see how he's testing it he might be testing at the schrader fitting in the filter housing. Hope this helps Merv

 

[1tuffram]

So where is the correct place to test pressures. I was under the assumption it was the schrader valve on the VP-44. I would like to know why all dealers are not on the same page when it comes to testing lift pump pressures. It seems to me if dealers would follow the service manual (like they should be) then there would not be all this huss and fuss. And one more question, why is it all dealers are not up to speed with the most current lift pump pressures from STAR and why all the attitude when an owner tries to explain new lift pump pressures have recently come out and to just give STAR a call to verify... ... Oh that's right, if you heard it on the internet it is not credible, afterall they are the Dodge authorities and know it all while us "common" folks don't know a thing

 

[John Berger]

So to test lift pump pressure you need to measure pressure at the VP44? How accurate would that be considering the filter is another restriction between the lift pump and the injection pump? Not saying it's wrong, but I would think if you wanted to measure for lift pump specs, you would do it right after the lift pump before the filter to avoid the filter restriction. Get me up to speed on this if I'm out in left field. TIA



John

 

[zimman20]

John-



If you check the pressure at the inlet to the VP44 with a CLEAN filter the difference between that pressure and the pressure pre-filter will be negligible. If the filter is dirty and as it gets dirti(er) it will reach the service point, and if you have an in-cab gauge you can watch the pressures decreasing as the filter gets dirtier. If your in-cab gauge is showing declining pressures and you have your gauge connected post-filter those declining pressures should be restored to 'good' pressure once the FF is changed, if not, the indication would be that the LP is going bad.

Either way, easy enough to check by connecting a gauge (Briar or other) to the Schrader valve pre-filter to see what the reading is there.



Reduaram- Have you checked/changed your FF? Had to ask!



I see you have another thread started where you won your battle. Why didn't you just update this thread? Again, had to ask!



zman

 

[tgbol]

The Cummins number is 3990105.