Engine/Transmission (1998.5 - 2002) Wanna fix your lift pump problems?

[Blkdawdg]

I believe that they reflash the ECM through the OBD-II plug under the dash.

 

[Whitmore]

Today I changed my fuel filter for the first time since I did the fuel system bomb and much to my surprise when I pulled the top off the filter canister and drained all the old fuel out there was a constant trickel of fuel comming from the inlet line into the housing, yep since the fuel load is higher than the filter housing the fuel was weeping past the supply pump and feeding itself with no help at all, I went ahead and changed my oil and when I was done with that the filter housing was about an inch and a half from the top so I slid a new fuel filter in there and some of the fuel spilled out over the edge, tightened it up and didnt have to bump the starter at all it just fired up no hesitation either.



This told me a big story for what the mod did for me, if I had a chance to do it all over I would go with -8an over the -6an but am still very happy with what it is doing for my truck.



Cheers, Kevin

 

[Jonz]

Lift Pump

All this about the lift pump location, pushing fuel or pulling fuel. Seems that there are to many inconsistant factors out there. Some people say they need to move there pump and add a pusher pump to maintain 15psi. (Pressure comes from a threaded banjo bold on the side of the Injectipon Pump) This makes me wonder. My truck has Dodge trabsfer pump in the stock location with no mods to the fuel system other than banjo bolts. I idle slightly over 15psi... ... at 65mph I'm 15psi. WOT racing up a sand dune it goes no lower than 10psi. Now... . if there is a flaw... . wouldnt it be consistant among ALL vehicles. NOTE: I have changed the pump form the one that came originaly on the vehicle... . it was crap in the highest degree. Dodge replaced it and all is well.



Just food for thought. If the stock pump works on my Bombed truck in the stock location and makes those kind of pressures and seems to be making the same pressure as the bombed fuel systems. What else is going on.



Currently I have 98k on my truck. 80k bombed as listen in my sig. I also just added a Piers turbo about 10k ago. The LP was replaced about 50k ago.



Not trying to make waves... ... . just something to think about.



Troy

 

[IWeiny]

Jonz

I am not trying to make waves either but I had a very stock truck up till 3 months ago and lost a lift pump 2 years ago. Comming from someone who did not know there might be an issue I just can't believe that this is a good design. I have my own theorys as to what might have caused my problems be just before I did my EZ I got a FP guage on and I was only seeing 10 PSI at idle from this 2nd pump. I think the issue is the lift pump will work for some time. But eventually they, like all things, wear out. But these seem to wear out faster than everything else. And the bigger issue and danger in my eyes is losing a $1200 Injection pump because of it makes me .



Now that I have the EZ I can't really complain as I do think that most people losing the pumps are over taxing the fuel system and really need to modify the lift pump situation. I for one will be if I do injectors. But many have had failures with stock trucks so modified fueling boxes and what not are not the only cause.



That is my $0. 02,

 

[Ncostello]

Jonz... most everyone makes those kind of numbers in the original location with a good pump. Question is... how long does the pump remain good... and what causes the pumps to fail and no longer produce those numbers. It is often believed (as I do) that the stock location may be a contributing factor in pump failure. I've got other theories... one being the design of the banjos as well as the bolts themselves (and it has little to do with the hole size). Minimal amounts of water and solid debris is another.



Dodge alone probably has very little if anything to do with the transfer pump... except for the fact that its on their trucks and they are the ones stuck with providing warranty work when they fail. Its made by Carter (Federal Mogul) and comes with the Cummins Engine. I work on a fire truck with an ISC 8. 3 and it basically has the same Carter pump albeit in a different location with different operational parameters.



On ISC's it runs to prime a dry system after a filter change and during startup. The injection pump takes care of "pulling fuel" duties after that. On ISB's it runs constantly as the VP dont pull fuel well on its own. Was the Carter made to run constantly for over 100K? I dont know. Its alot to ask of such a small "cheap" pump. It needs all the help it can get I think.

 

[Pit Bull]

Originally posted by Ncostello





On ISC's it runs to prime a dry system after a filter change and during startup. The injection pump takes care of "pulling fuel" duties after that. On ISB's it runs constantly as the VP dont pull fuel well on its own. Was the Carter made to run constantly for over 100K? I dont know. Its alot to ask of such a small "cheap" pump. It needs all the help it can get I think.

I was at my dealers today and talking to the parts guy, DC must of done something to improve the pump. He said for over a year or so they have only been replacing around one per week where before the 02's came out they were replacing one everyday.