Lift pump question

[Sregorb]

OK tech experts out there, here's one for you to check. Does the 03 lift pump appear to have the same issue as the 2nd gen's (long draw length from tank)? Is it the same setup or modified from 02 to 03?



Brian

 

[dmurdock]

Pump is close to the same, but not really an issue... the injector pump on 03's doesn't require feeding like the vp44... Cummins even sells the engines in applications with no lift pump at all.

 

[krabman]

With nothing more than an ez you can pull vacuum. Do that for long and your truck will miss and then stumble and if you really flog it you can stall it. The jury will be out on its longevity on a stock truck till folks can put in the milage but there is no question that you are going to need to make a change if theres bombing in your future.

 

[Prairie Dog]

Some of our members have more than 60K now and nobody has reported a lift pump failure. I work with a guy who bought a 2002 and his went out at 14K. So it looks like the changes have helped and the problem may have finally been put to rest.

 

[Cj84gpn]

As a previous owner of a '99 2G truck that ate 2 LPs in 24,000 miles I'd like some info on this as well.



Been digging through the searchs of how the injection works on the 3Gs. I have it figured out for the most part, is there a thread anyone knows of that gives good details on the relationship of the LP to the injection pump and then to the fuel rail?



No BOMBs as of yet, but there will be. The bad habit my 2G had about eating lift pumps was one of the main reasons for trading it in at 24K miles, that and I wanted a new truck. The ETH/DEE combo is sweet! Beats the 235hp/5speed combo hands down, even with the ETC on a chip.

 

[raychem]

Hopefully Keith from DD or some one from the other performance oriented companies can chime in on this. Having never owned a a 24v before, I would also like to be more informed on the subject.



Richard

 

[dmurdock]

Originally posted by Cj84gpn

As a previous owner of a '99 2G truck that ate 2 LPs in 24,000 miles I'd like some info on this as well.



Been digging through the searchs of how the injection works on the 3Gs. I have it figured out for the most part, is there a thread anyone knows of that gives good details on the relationship of the LP to the injection pump and then to the fuel rail?



No BOMBs as of yet, but there will be. The bad habit my 2G had about eating lift pumps was one of the main reasons for trading it in at 24K miles, that and I wanted a new truck. The ETH/DEE combo is sweet! Beats the 235hp/5speed combo hands down, even with the ETC on a chip.

There's a huge article in one of the 2 last issues of TDR. .

 

[Mopar_Mudder]

Originally posted by krabman

With nothing more than an ez you can pull vacuum. Do that for long and your truck will miss and then stumble and if you really flog it you can stall it. The jury will be out on its longevity on a stock truck till folks can put in the milage but there is no question that you are going to need to make a change if theres bombing in your future.

Have to disagree, I have an EZ running it on Level 4 I have a hard time getting the fuel pressure to drop down to 3-4 psi. Close to 10 at an idle and 8-9 crusin down the road.

 

[krabman]

Mine had the same idle pressure before the lift pump but I could pull it down to zero instantly with the ez. Talking to Lenny at Dyno'Mite Diesel and he tells me that he has seen everything from 30 to 90 hp out of 03 ez's and Im talking about the standard 4 level model. Add that to the fact that some lift pumps are weaker than others and you get the result you are talking about. I know two other people with 03s and ez's and both of them pulled theirs down to zero as well. I know your on the DTR so ask Rod, he stalled his on the freeway during a romp from fuel starvation, thats stock truck and an ez. Or Try Jessie T. , he gained 30 hp on a truck with threes/DD's turbo/ez with nothing more than the installation of a pusher. That was same dyno, same operater, a few days apart. My own truck went from a max of 35 boost to 37 with the addition of a pusher pump. Yes I have read the Dmax's dont have one so we dont need it posts but the truth is when you see it with your own eyes its hard to deny. This then leaves the question of durability. Will the stock lift pump have better longevity? Dont know, to early to tell IMO. Will starving the cp3 hurt its longevity? Again, I dont know. I havent found anyone yet that does. The only thing Im sure of in that regard is that it is very expensive and I am my own warranty station. To sum it up, I have seen with my own eyes that power is lost with the stock lift pump, I sleep better at night knowing my cp3 isnt being starved. A no brainer to me.

 

[Mopar_Mudder]

Rod it actually sending me a Pyro to test with against my X-Monitor. Reason being that I am not seeing the high EGT that most are seeing with the EZ either. I have only got it to 1200 once and that was at 30,000# GCVW. So either I am one luck SOB and have good fuel pressure and low EGT or something is up. On the other hand I have gotten 38 PSI of boost and can get it to 35-36 pretty darn easy. I think the EZ box is working, it seems to have an increase in power from level 3 to 4 but it is all SOP. Their is no Dyno remotely close to here to try and test anything really.

 

[krabman]

I haven't dyno'ed mine either since the ez. I actually have lower max temps than running without it although they climb much faster. I know it is working to some extent cause I can definitely feel it via improved seat of the pants although I didn't feel it made the huge difference some have reported. When I put in the injectors I'm going to see if I can get em to do a run with and without before the injector install. If I remember rightly you had the ez on before you got the gauges? It is kind of odd how different peoples trucks seem to be responding in different ways.

 

[Mopar_Mudder]

Yep I only ran it on level 3 with out guages while I was waiting for the X-Moinitor to show up. When I went up to level 4 it felt stronger then on level 3. It for sure has more get up and go then stock, I put it down to level 1 one day for the heck of it and you really notice the loss of power. The power is much more obvious when you pull something though. This things rolls down the road at 30,000# gcvw like it is hardly working it, it pull about the same as about 20,000# did stock I would say. Much more useable power, oh and did I mension it is pretty easy to slip the clutch in 2nd gear while pulling now

 

[Parshal]

I haven't had a fuel starvation problem and I've run my EZ on all levels at different times. I romp on it virtually every time I drive it, too. Increasing the level one at a time has increased my SOP measurement all the way to level 6. My EGT's aren't significantly different with the box and boost elbow. I haven't gone much past 1200 and those times have been very few. Boost has hit 32 once or twice but usually doesn't exceed 28 or 29. I have the SO, though.