Engine/Transmission (1998.5 - 2002) VP44 without lift pump change

[Dezilplow]

Well the guy doing the warranty work for a bad VP is saying he's getting 10 psi and 825ml off the lift pump at idle so he's only changing the VP. Im pretty sure 10 is fine but wanted to double check with you guys. He didnt check WOT and said he didnt need to. I dont think Ive ever heard of anyone changing the VP without a LP change also, how common is that? Im pretty suspect of this guys reputation as Ive already caught him in a couple lies.



Oh yea, is shipping to the mechanic covered under warranty or does the customer usuelly eat that? When checking the VP, dont you have to remove the throttle body? I can tell nothing from the filter to the top of the engine had a wrench on it or line off. Im just wondering if this guy is BSing me.

 

[16919]

Thats too low... . you shouldn't pull it under 10 at wot. Tell him that the both NEED to be changed. Watch yourself he is trying to weasel out of extra work..... vp/lp press @ idle should be +/- 15 psi.

 

[16919]

On another note I would look into adding a pusher pump or an after market ful system anyways. The stock lp is not reliable.

 

[Bob4x4]

Thats too low... . you shouldn't pull it under 10 at wot. Tell him that the both NEED to be changed. Watch yourself he is trying to weasel out of extra work..... vp/lp press @ idle should be +/- 15 psi.

Cummins and Dodge both use flow volumn now not psi. Where are you getting your info from?



Bob

 

[16919]

My numbers come from many places. Just about anyone on here would agree that a good stock lp should idle at 14-16 psi. Optimum idle pressure for a vp is 13-15psi.

As far as my don't pull it below 10 psi, yes I would agree that no one has formally said that but that is what I am comfortable with as well as what I have been told by many others that run high performance diesel shops and are competitive pullers. I can say that I have read and heard not to run it below 5psi because the pump will not be fully filled. If you believe otherwise that is fine with me and I have no problem with it. Everyone is entitled to their own thoughts and ideas. I was just passing mine on to another that had asked for advice.

 

[lcoblentz]

My thoughts are that as long as you have adequate volume, the pressure will take care of itself. I subscribe to the belief that the stock fuel lines are too stinkin' small, and that contributes to the problem. After putting on my 3rd lift pump in 60,000 miles, I just called Glacier Diesel and ordered the full Walbro kit for mine. I moved the stock LP to the frame rail and went to 1/2" lines from the tank to the VP. The newest lift pumps from Cummins seem to show less pressure. I guess it's a side effect of changing the bypass. At any rate, I don't like 'em



As for the original question, My VP was replaced under warranty at around 25k miles, and they also refused to replace the lift pump. I changed it out on my own about a month later. Pressure is easy to monitor, so that's what everyone does. I replace mine when it shows signs of being weak. And, that includes when it starts getting noisy. Lift pumps are a heck of a lot cheaper and easier to replace than injector pumps. Hopefully the Glacier kit will take care of it for longer than a year or 2

 

[16919]

The Glacier kits are nice and they will support extra hp. I would change to an after market system no matter what I did with my truck.

 

[Spunkys Ram]

I only read the thread headline and can only think, WTF. Why would you spend over $1000 on a VP and not $100 on a BRAND NEW lift pump!!!!