Thats good to know, I need to dig out my paper work. Thanks, LCH

 

Tell me about it. When I picked up the truck tonight, there was already a spot under it. I got under the truck with my flashlight at home, and there is diesel covering the wiring harness. A BLIND man could see it!

If I get out of work early tomorrow, I'm going to drive back over there, and get him UNDER the truck, and stick his nose right in it!

 

Swat 'im with a rolled up newspaper, too!

Bad service writer! Bad!

 

So if I understand my warranty book right the 3yr 36 is dodge and the 7yr 100,000 is cummins and it says it covers fuel injection pump & injectors on page 12 under "whats covered".

I remember when we bought the trucks they were saying something about more warranty when we bought them, anyway it looks like it should be taken care of way past 36,000, I love this site! LCH

 

It really is frustrating, Dave. You don't even need a flashlight - put your finger on it, and it comes back coated with diesel.

 

I think the CP3s are leaking because the lift pumps aren't keeping them supplied with fuel. CP3s need enough fuel to supply the engine and to keep the CP3 lubricated.

When a CP3 runs without enough lubrication the internal clearances will grow, ie the pump wears prematurely and the seals will dry out/over heat.

 

So you're saying that this could be indicitive of a lift pump slowly dying?

 

Yep. There isn't any reason why CP3s should start leaking if they have lubrication. The leak is indicative of wear issues.

 

How can I tell if my lift pump is going bad? Does it leak as well, or is there some preformance issues. I tried to get my dealer to replace the lift pump as well, but they would not.

 

You'd have to put a gauge on the inlet of the CP3 and run the engine at WOT and see what sort of supply pressure is there.

Dealers think they are saving money by not replacing the lift pumps. Then they get these trucks that smoke at idle, knock, have leaking CP3s, etc. Gives the whole engine a bad name.

CP3s are like VP44s. They need excess fuel for lubrication and cooling. No excess fuel = failed CP3 = knock at idle, smoke at idle, hard start hot or cold, lack of power, leaking CP3, etc.

CP3 is a pretty simple pump. Simpler than a VP44. No reason for them to be failing.

 

This brings up another question, I don't see anything about the lift pump in the warranty book just the injection pump which I assume is the cp3 so how far does the warranty usually cover the lift pump?

 

Same as the injection pump.Most of the CP3 leaks have been after a cold snap and the newer pump is a redesign.Sounds like a internal seal problem more the a lubication problem.

 

My CP3 leaks and I have run a FASS since 1,000 miles. It only leaks in the winter, and then only when I use a pressure box. No pressure box in the winter = no leaking pump.....at least on my truck.

 

Truck never knew the pump was leaking only me! The engine never missed a lick. I thinh all the part numbers are changind to the newer pump. Drive it.

 

When I went out to my truck this morning, after I picked it up from the dealer last night, there was a very nice spot of diesel under it. I put some cardboard under the truck here at work, so I can PROVE to my dealer service tech (who apparently is legally blind, as you can CLEARLY see fuel on the wiring harness) that there is a leak.

I have been reading the other threads here about CP3s and lift pump issues. My truck has not suffered any performance issues. Still runs like a top.

I just don't understand why these dealers are so blind. C'mon, the Internet has been around for YEARS, don't ANY of these guys have a clue? I'm not even a mechanic, and I know more how to diagnose these problems than the dealers.