How Do You now ?

[Big B]

How Do You Know?

What does it do when lift pump is getting bad? Mine idles rough when I stop coner. Or when I unplug my ez it idles smooth. Could I have A bad ez

 

[MikeR]

Don't waste time guessing, hook up a pressure test gauge to see if it's going bad.

 

[pwr2tow]

All I can say is gauges, gauges, gauges.

I have had 3 lift pumps go bad on my 4th now and I never could tell anything was wrong as far as truck symtems. The last lift pump would go dead for approximately ten miles then start working again, and at start up it would jump all over the dial, never did have any symtems that I could tell it was dead. I think alot of people driveing around without gauges might have bad lift pumps and they are not aware of it until one day the injector pump up and dies (over working) from lack of extra fuel from lift pump.

Ron

 

[Pit Bull]

Originally posted by ronsram1999

All I can say is gauges, gauges, gauges.

I have had 3 lift pumps go bad on my 4th now and I never could tell anything was wrong as far as truck symtems. The last lift pump would go dead for approximately ten miles then start working again, and at start up it would jump all over the dial, never did have any symtems that I could tell it was dead. I think alot of people driveing around without gauges might have bad lift pumps and they are not aware of it until one day the injector pump up and dies (over working) from lack of extra fuel from lift pump.

Ron

Ron

You are right about the gauges, being a good idea. But I disagree with you on the idea that a lot of people are running around with bad lift pumps. If that were true Dodge would be doing more to address this problem since the injector pump is under warranty for 100K miles, it would get real expensive for Dodge to allow a bunch of bad lift pumps to ruin injection pumps. I think that the lift pump is a problem area on our trucks and having a fuel pressure guage will help ID it and get it fixed before it can cause damage to the injection pump, but I also think it is a problem that is more common to the members of TDR who have a tendency to bomb their trucks.

 

[pwr2tow]

Big Toy,

I think we both agree on the same thing only from different points of view.



I don't see how people can corilate lift pump failure to bombing. The lift pump is a constant velocity fluid drive pump and the only way it could be hard on the lift pump is if you were to suck more fuel than what the pump could deliver or block it off so it could not pump fuel. If you take the strain off the lift pump by allowing free flow (more fuel flow) then I would assume it would be easier on the lift pump. Now the injector pump is a different story since you are asking it to do more work.



My lift pump problems did not start after I started bombing, I went through 2 lift pumps and I was stock.



I agree that the injection pump is expensive and DC would want to keep from replaceing them. I think the injection pump can live for quit awhile with a bad lift pump as long as the lift pump is pumping even 1 psi (the injection pump can suck fuel). That's why I stated there are bad lift pumps without people knowing they have them. Now if a person was to bomb his truck with a bad lift pump then they would find out real soon they had a bad lift pump (injection pump dieing) or if they worked the truck real hard in pulling something. I find it strange that even cummins doesn't reconize lift pump problems, only people that have gauges have lift pump problems. My conclusion is that there are bad lift pumps, people just do not know it until they put in gauges or their injector pump dies.

Ron

 

[Big-D]

I agree with you 100% Ron. There is no way to tell what your system is doing without a recoding device. Gauges are cheap for the peace of mind and insurance they provide. Dave

 

[pwr2tow]

Big B,

Does your truck run rough at any other RPM's other than idle?

Does it do the same with EZ on or off at same RPM's?

Ron

 

[Big B]

Put a pressure gauge on 12 to 14 psi . It will run rough at about 1600 RPM besides idle. then smooth out about 2000 RPM

 

[LSMITH]

Big B, does the rough spot at 1600 go away with the EZ off too? I see in your original post that the idle is good w/no EZ, but nothing of the 1600 roughness. Also what was the fuel pressure at WOT and 2500 RPM plus going down the road? Fuel pressure at idle means little. There have been quite a few reports on here of good pressure at idle and little or none at WOT. Let us know.

 

[Big B]

Unplug EZ runs smooth at idle and 1600 RPM. Now it started a knock up front buy the pump somewere. Going to take it to shop on wed.

 

[tmacc]

Big B, I think that if you take your truck, w/ EZ unplugged, on a smooth road w/ a slight grade and cruise at about 16-1800 rpm you will probably notice the hesitation or bucking that some of us are experiencing. It will probably be very suttle, but it will be there. I have they same thing w/ mine. Check out some of the hesitation/bucking/shudder thread elsewhere on tdr.

 

[JBrookshire]

1st gens

This cant happen to first gens can it?????

 

[tmacc]

JBrookshire,

Relax, unless you've converted your first gen. to a vp44 pump (Just kidding. Why would anyone do that. ) you won't have this problem. Strickly a problem for 98. 5 and later trucks.

 

[Big B]

I took it to the shop. They said the knock is number one. They are taking the head off tomorrow.

 

[tmacc]

Bummer!

 

[JBrookshire]

whooo

Thank for that news. Now I can go on rattleing heheh

 

[Briar Hopper]

It is not a problem solely on "B. O. M. B. ed" trucks. It can, it does, and it has, happened in many separate instances on stock trucks. There is a wealth of reading available in the TDR archives on this subject. Also articles in back issues. We have a lot of new people asking the same questions without taking the time to read back a year or two... you'd be surprised how much you can learn if you do so. A lot of technical information and how-tos, from experienced mechanics who have been there, done that, but got tired of answering the same questions over and over in this forum.

As for Dodge, they do not, and never have, given a flip about preserving any part of your truck in order to save themselves on warranty costs. The lift pump issue is one they are aware of, and it may have been corrected in the 2002 model. MAY HAVE. I DO NOT KNOW THAT FOR SURE. I doubt it, as the new common rail fuel system in 2003 will probably do away with those pumps. Dodge WILL NOT recall or othewise help us out on this lift pump issue. Anybody that believes otherwise, pass me some of what you be drinkin'. Forgive my bluntness. All of what I've said here has been proven, independent of my opinion or anything I could say.