Engine/Transmission (1998.5 - 2002) 2001 fuel tank module

[mbelanger76]

So dodge no longer makes the fuel module without the intank pump, My module is shot. I don't want the intank pump cuz I installed a fass direct replacement lift pump some time back, I've been reading about the jeep liberty module, but don't need a giant draw straw, running the edge easy and everything else is stock. Can I pick up a stock jeep liberty module and will that work or are there other options for a guy who doesn't need a hot rod truck?

 

[GReed]

Give Vulcan Performance a call. They should be able to answer all of your questions regarding the Liberty module.

 

[twheat]

Ive got a liberty module in my rig from Vulcan. It works great. I believe there are options on how they can build it for you. Why don't you want a "giant draw straw?" I saw 2 PSI more in fuel pressure when I put mine in... . just curious.

 

[mbelanger76]

I have a FASS direct replacement lift pump that works great and uses the original plumbing. 14psi at idle and 7psi at WOT. The most I pull is around 10,000 lbs which my set up handles with no issues

 

[jeepit]

Shouldn't be dropping to 7 on WOT. My Airdog never drops lower that 12 WOT.

 

[JDiehl]

Look at fuel sumps. Down side is cutting a hole in the bottom of the fuel tank. From what I have read it does away with the 1/4 tank issues. It hangs down around two inches below the tank. I saw a low profile design but don't remeber who made it.



I have a sump from beans diesel performance on my shelf to install in the near future.

 

[mbelanger76]

Fuel module wasnt the issue. Ok I should start from the beginning. This problem started a month ago while driving my truck started to stumble, looked at my fuel pressure gauge and it was at 0, was able to get home and thought the lift pump failed so I replaced it and truck had good pressure but dropped off to 0 while running truck that's when I called a mechanic. He thought the pump was shutting off for some reason so wired it up to the ignition switch, still doing the same thing. Replace pressure regulator, same problem. Dropped tank installed jeep module, no luck. Replaced fuel line from tank to pump, removed lines from lift pump to VP44 and cleaned out, same problem. Pulled fuel filter housing and found metal pieces I the heating element cleaned that all out reinstalled and same problem. I am running out of ideas

 

[BarryG]

I am sort of in the same boat as you. Sometimes my pressure will swing big, sometimes stay very low 1-2psi and other times stay fine for days however at no time does my truck stumble or seem like it is not getting enough fuel. I have replaced the module as I had a torn screen etc with the liberty module. I have replaced the fuel lines from tank to pump, from pump to filter, from filter to vp. I have verified my guage is accurate with a second gauge, I have replaced the fuel filter. My pump is not electric (I put in a cam a couple years ago and am running a mechanical fuel pump off the cam fuel pump lobe (ie 12 valve fuel pump) so electrical power is not an issue or is it the pump. I have tried a second pump as well just to make sure. Obviously I am running a bypass for it since it will run 40psi. I have taken the bypass out and it will do it without that in so that eliminates the bypass as a problem (i did put it back in after the test). I have replaced the vp44 fuel pressure bypass valve as well. I have inspected the fuel filter cannister thoroughly. I have tried running with the fuel filler cap off to verify there is no vacumn or pressure building in the tank. There is nothing left to replace in my fuel system except the vp. Since the injectors are only fired off by the injection pump allowing enough fuel pressure to pop them off (unlike the cr ones) I dont see how they can be the problem. Yet while the pressure can be erratic, very low or just fine in all cases it runs great regardless of operating conditions such as towing in the mountains etc.



At this point I am thinking it is free flowing through the vp somehow and back to the tank through the return line. Though the diagrams of the vp I have seen do not really support that theory. I have not tested that theory as I am unsure of exactly how to do that I guess some sort of flow test to see how much returns in the different conditions but a few problems with that. One being I cant predict when it will happen and two at idle I dont know that I would see much flow difference at idle and doing that while driving seems a bit dangerous. I am at a loss.



All the above may very well mean nothing to your issue but it may give you some additional things to try.

 

[mbelanger76]

My truck will stumble and stall once the psi drops off. I know the VP44 will run for a long time without the lift pump then finally fail. So I'm kind of sure it's not the VP44 I'm thinking of bypassing the fuel filter to see what happens. I also ran it with the fuel cap off to see what would happen and when I run the lift pump straight out of a can it seems to run good but have no way of testing it on the road.

 

[Kent Kuykendall]

i was having fuel delivefry problems with my98 and put in volcan draw straw and ended problems stays at 14 never below 12

 

[mbelanger76]

Finally solved the problem, I retraced my steps and after the fuel module replacement debris from the tank must have migrated into the banjo bolt screen which I had cleaned out initially. Truck is back on the road thanks for all the help.