I have something weighing on my mind that I am hoping the more experienced crew can maybe lay to rest. I have read that once the lift pump goes out on these trucks it has in essence turned the injector pump into a ticking time bomb. Is this true in all cases or only in most cases? I ask because my lift pump went out about 5,000 miles ago. Truck started fine after work, drove it a mile to grocery store and when I came out the truck wouldn't fire up. Replaced the lift pump and fixed the problem. Now I am wondering if it is only a matter of time before my injector pump gives up?

I have recently installed a fuel pressure gauge on this truck and am shopping FASS pumps now.

 

Without sufficient fuel pressure the VP does not get the cooling or lubrication effects from the fuel. With out this your VP is running on borrowed time. You want to keep fuel pressure up to about 15psi. Even though bosch says you need 10psi minimum to make is survive I recommend more.

The best thing to do is keep an eye on the fuel pressure and start searching for a FASS.

 

So, my lift pump crapping out on me once doesn't necessarily spell disaster on the horizon then?

We all but have the money for a FASS now. Just wish there wasn't so much to do on the truck in order to make the decision an easy one.

 

Yeah I know the feeling so much to do to these trucks. Both for fun and reliability. First and foremost keep an eye on fuel pressure. And you will be fine.

 

Especially when its been used and abused for awhile. Glad you can commiserate. Thanks for offering your opinion on the matter!

 

My 01 had a brand new in tank lift pump when I got it. I installed an FP gauge shortly after and was quite surprised how poorly it worked. I got 14psi at idle, but any more than 1/4 throttle and you were well below 10psi, getting to 5psi at only 1/2 throttle. I drove like my grandmother until I had the money for my FASS. Now I still have 14psi at idle, but it never drops to more than 13.5 when I floor it.

 

14 psi is pretty low for a FASS. Mine holds 18 all day long.

 

I know, I just sent a e-mail to their tech support as my pump is leaking now as well.

 

I have a 2002 5.9 Cummins. Recently I was on the highway and felt a couple bumps, then within a mile my truck died, and wouldn't start. Got towed home and found the fuel canister 1/2 empty. I assumed that the lift pump had died, truck has 113,000 miles. I purchased with 100,000.
So I purchased a lift pump (in tank) and fuel filter and bleed the air out and she ran strong for 100 miles, then I was on my way home and felt it surge like it was out of fuel a couple times but made it home. Pulled the fuel filter out and it was half full again.
I replaced lift pump again, and installed isspro fuel gauge.Here's where it gets weird, the fuel pressure gauge will go up to 13 when you bump the engine for about 25 seconds, then the lift pump cycles out, and if everything is primed it will start but shortly run out of fuel. The fuel pressure never comes of 0 while idling. I have replaced all crush washers and over flow valve on return line, because it failed test.
Replace lift pump again from dodge, same thing... turned ignition on 3 times and get p 0122 and p 1693
Throttle position sensor. But as a few days ago there was no codes? Kinda stuck. I have only been driving diesel for 2 yrs, don't know a lot about them?
Still running out of fuel, don't want to damage injection pump
.

 

You really need to get a aftermarket lift pump and leave the factory ones alone. All the money you have spent on the oem pumps you could have had a nice fass unit.