Stock Lift Pump Longevity?

[jacqnbill]

Mine started acting sporadic and died 100 miles later at 31k on my '03. Replaced it with an aftermarket and no problems since.

What aftermarked pump did you buy. I checked your sig and got totally confused.

Bill

 

[Gypsyman]

Bill,



I went with the RASP which is a belt driven feed pump. It's more expensive than most out there. I'm working on a system for implementing the Walbro pumps on the 3rd gens. If everything works as planned and I can get the fuel filter adapters built for a reasonable price I'll put together a kit and list it in the "basement enterprises" section of the classifieds.



Richard

 

[Elite1]

My 03' went out at about 45k, but I do have a fairly aggresive box. So I didn't take it to the dealer. I bought 2 new pumps from Cummins, installed one and kept the second as a backup, it is in my tool box... just in case! I now have about 75k on the truck without any further issues, so far.



This truck has really been a great truck as that fuel pump has been the only issue. Which may or may not have been caused by the "volumizer box".



btw: I do use standyne fuel conditioner in every tank and I change fuel filters every oil change, which is about 7000 miles.

 

[Prairie Dog]

Prairie, I know that I've read somewhere that the stock 3g lift pumps only work for a few seconds when priming during the initial start-up. If the truck doesn't start initially the second attempt at starting will cause the pump to run for 20 seconds. I believe one of the TDR staff writers did an article on this when the 3g's first came out.



Regards, J. Ray

True enough, I remember that article but I suspect that theory was based on knowledge that the 8. 3 Cummins turns off the pump after the eng starts. Once we got our hands on a few of the first third gens it became apparent that our pumps never shut off after the eng starts.



Scotty

 

[jacqnbill]

Thanks and keep us informed on youur progress.



Bill

 

[Gypsyman]

I'll do that Bill. I haven't said much out of respect for the paying advertisers on this site. I don't want to cross any site guideline. If it works I'll take the appropriate steps to get the information out. Should be a neat kit if it all comes together.



Richard

 

[CBrabec]

When I took it out for a spin, and I had it at WOT, it only seemed to drop 1psi.

Means you got a good one. Watch if for a while and see if stays the same or slowlt starts dropping. The 6-7 psi at idle is pretty normal for the 3rd gen pumps. The flow is supposed to better and not need the pressure.





NO!!! I am not opening that can of worms again!!!





The 02 is different pump and setup and supposedly needs and will generate higher pressure. If you start drawing the pressure down under 4-5 psi then is the time to start worrying. If you are going to replace the pump do a search on lift pumps then settle in for some reading time. There are other options available.

Well, I took it out for another spin today, and idle was now between 5-6 psi and then at WOT it did drop to around 4 psi. Should I replace the lift pump with a new one to be safe? I'm going to have a FASS 150gph pusher put on in about a month, so should I waste my money on a new lift pump or will the FASS pusher help bring my #'s back up? Also, does anyone know when a FASS pusher is installed, does one bypass the LP?



chris

 

[MPletchetero]

Prairie, I know that I've read somewhere that the stock 3g lift pumps only work for a few seconds when priming during the initial start-up. If the truck doesn't start initially the second attempt at starting will cause the pump to run for 20 seconds. I believe one of the TDR staff writers did an article on this when the 3g's first came out.



Regards, J. Ray

According to the service manual,with the engine running,the lift pump has a 100% duty-cycle with a minimum pressure of 11,5 psi.



Manny

 

[jray]

True enough, I remember that article but I suspect that theory was based on knowledge that the 8. 3 Cummins turns off the pump after the eng starts. Once we got our hands on a few of the first third gens it became apparent that our pumps never shut off after the eng starts.



Scotty

Thanks Scotty,

Yet another reason to renew my subscription to TDR each year. It's a continual learning process.



J. Ray

 

[cerberusiam]

 should I waste my money on a new lift pump or will the FASS pusher help bring my #'s back up

You should be OK until you get the FASS. Just watch the pressure. Depending on the relief spring you put in the FASS will give you 12 to 25 psi of pressure. Not positive but I think you have to take out the factory LP to get it to function correctly.

 

[rbattelle]

According to the service manual,with the engine running,the lift pump has a 100% duty-cycle with a minimum pressure of 11,5 psi.



Manny

This part of the manual was later corrected by DC to remove the reference to 11. 5 psi. Instead, there is a flow spec of 38 GPH minimum.



There is NO minimum required pressure specification for the CP-3.



-Ryan

 

[MPletchetero]

This part of the manual was later corrected by DC to remove the reference to 11. 5 psi. Instead, there is a flow spec of 38 GPH minimum.



There is NO minimum required pressure specification for the CP-3.



-Ryan

Ryan,Thanks for the info. No wonder I could'nt get my FP gauge to read that high. Mine only reads 7-8 psi on stock LP.



I've read thru a lot of threads talked about how critical FP is to the proper operation of the CP3. If the CP3 only requires a flow rate spec,and no minimum required pressure spec,installing a FP gauge would be a waste of money,then ?

Manny

 

[rbattelle]

If the CP3 only requires a flow rate spec,and no minimum required pressure spec,installing a FP gauge would be a waste of money,then ?

Manny

On the surface that might appear to be true, but it's not quite. Personally, I feel the absolute best thing to have is a flow rate gauge. My system is actually plumbed to accept one, but they're quite pricey (>$300). So instead, I monitor the pressure (for now). I know if I have positive pressure at the CP-3 and I can't pull it down to 0 then the CP-3 is getting enough fuel to meet engine demand.



Your experience is precisely why the manual was changed: none of the stock LPs can achieve 11. 5 psi (well, the vast majority anyway). A stock LP at 6 or 7 psi is functioning normally, as far as I'm concerned, and will properly supply the CP-3 unless a fueling box is installed.



-Ryan

 

[CBrabec]

Talked today to my DTT rep. and he told me that on the 3rd gens, we should see 9-12 psi at idle, no less. If it is less than that, he said to be careful and it wouldn't be a bad idea to have a spare on hand or just up grade to a FASS system, espically if a person runs any type of fueling or pressure box. The FASS will take care of any future issues with the LP. Just my $. 02



chris

 

[Cummins4WD]

I'm stranded in Burley, Idaho 83318 as my lift pump just went out without notice tonight at 2am going west on I-84. I left Denver, CO at 11am yesterday and was heading to Ephrata, Washington.



My truck is a 2003 with 70,000 miles and Edge EZ. I was tooling along most of the day at 68mph for the 600 some-odd miles. I managed 19. 2 mpg with a lot of head wind and the rpms at 1850. The EZ was on setting 4 and I had two short burst to around 100mph to get away from some semi's that were riding my tail.



I changed my fuel filter at 55,000 miles and I use no additives or B20 bio-diesel... I've only put regular Diesel in since I've had the truck which was at 27,000 miles.



I didn't even get a warning light ahead of time... it just lost power and died and I coasted to the side of the road with my 2 year old sleeping in the back seat. I hope they're not back ordered like I hear... does anyone know someone with a spare lift pump that would work on my 03? I'm thinking FedEx!



Are there any good Diesel shops around Southern Idaho that could put a FASS system on my truck if it looks like I won't see a lift pump for 2 weeks... I'm 800 miles from home! Call me at 303. 349. 1294 if you have any ideas... I forgot my TDR travel companion as well!

 

[Elite1]

I'm stranded in Buckley, Idaho as my lift pump just went out without notice tonight at 2am going west on I-84. I left Denver, CO at 11am yesterday and was heading to Ephrata, Washington.



My truck is a 2003 with 70,000 miles and Edge EZ. I was tooling along most of the day at 68mph for the 800 some-odd miles. I managed 19. 2 mpg with a lot of head wind and the rpms at 1850. The EZ was on setting 4 and I had two short burst to around 100mph to get away from some semi's that were riding my tail.



I changed my fuel filter at 55,000 miles and I use no additives or B20 bio-diesel... I've only put regular Diesel in since I've had the truck which was at 27,000 miles.



I didn't even get a warning light ahead of time... it just lost power and died and I coasted to the side of the road with my 2 year old sleeping in the back seat. I hope they're not back ordered like I hear... does anyone know someone with a spare lift pump that would work on my 03? I'm thinking FedEx!



Are there any good Diesel shops around Southern Idaho that could put a FASS system on my truck if it looks like I won't see a lift pump for 2 weeks... I'm 800 miles from home! Call me at 303. 349. 1294 if you have any ideas... I forgot my TDR travel companion as well!

When mine went out, The Dodge dealer said they couldn't get it for a week, so I got it from Cummins, a little cheaper and they had it in less than 24 hours. Not sure if there is a Cummins dealer up there.

BTW: this should be posted on 9/11 thread up on top, since you are stranded. *I just put it there for you.

 

[DPKetchum]

Dodge(D. C. ) I thought did not SELL or HANDLE the engine mounted lift pumps anymore. Only the retro fit in the fuel tank ones. To get a engine mount it would have to be through Cummins I thought. The pump is a 7/100 warranty (NO deducatble on this item)and Cummins cannot handle warranty on a Dodge truck. I would CALL D. C. Roadside assistance or Customer support. 1-800-992-1997. They should pay tow to nearest Dodge Truck store and get a new in tank pump in it.

 

[CSilkowski]

Inline pusher pump?

Will an inline pusher pump like a Carter or Holley allow 3rd gens to run despite a factory lift pump failure??

 

[Cummins4WD]

The dealer in Burley, ID just happens to have 1 updated in-tank 34g lift pump kit in stock... He checked what would happen if they had to order it... As of this morning there are 75 units on backorder all across the country.



I would have been totally screwed and would have needed to leave my truck here for a month to get fixed under warranty.



So as far as I can tell my truck should be back on the road today but I haven't got the official word from the service manager... I was mainly concerned that the part was no where to be found.



Has anyone had this new in-tank system go bad after a update on a 03 or 04 Cummins?



Thanks for all the great TDR support, I was really starting to freak out.

 

[DPKetchum]

One or two posts of early on defective units same as most new any part. Nothing way out etc.