Superduty

I've got a little Racor like that. I think that pressure limitation is the strength of the housing, ie bowl, not the filter element.

I am not saying that the element strength should be more or less than that, just that I don't think the 25 PSI is for the element itself.

FWIW, I'll be putting a Cat 1R-750 2 micron element on my engine in the near future. See the post in General Diesel.

kinghomes

Who has had intank failure on and 04?

kinghomes

Anyone whant to buy a slightly used fass bum. 256-990-5464 $500

kinghomes

I have read of only one intank failure. Any others?

kinghomes

Fass makes lots of noise wirrrr up and down

gmctd

Several things to remember, here -

A CP3 is not a VP44, and vice versa (and, do I ever like my vices versa!) - do not confuse the two systems, as they are night and day different, as are requirements

- CP3 has a built-in gear-type lift pump, driven by the main pump shaft - it easily pumps the 180psi housing pressure, and will pull 20" vacuum on the intake side - it is designed for draw-from-tank service, not requiring an external lift pump, in-tank, side of filter, frame rail, or anywhere else
- does create problems with filtration, tho, as the pressurized path between the lift pump and the hi-press injection pump is internal
- thus, the auxilliary lift pump feeding the filtration to the CP3

- VP44 has an internal transfer pump - it will draw fuel from the tank, but is not designed for draw-type service, requiring an external lift pump - VP44 is designed with constant-flow service requirement - pressure is not as important as long as the volume flow is sufficient to cool the electronic module attached to the top of the VP44: 1psi at 70gph flowrate provides much more cooling than 45psi at 1gph - Science 101
Majority of VP44 falures occur when the electronic module overheats and fails due to low fuel flowrate.

The VP44 and '03-'04 CP3 auxilliary lift pump systems are draw-from-tank systems - a pump designed for draw-from-tank service functions only if -

a. the filtration media remains at oem factory specs - 'nuther words, a functional draw-type system at 10microns can become a minimal- or no-draw system at 2microns, so inexperienced folks playing with filters can cause more damage than factory failures.

b. the external lift pump is flow-thru at fail, meaning it doesn't block the fuel path if not running - the Carter and Walbro pumps are not flow-thru at fail - thus, all the VP44 failures
CP3 will not easily pull fuel thru those pumps, much less the VP44 = VP44 just fails, where the engine starves or does not run with CP3, but seldom fails

Even draw-thru systems become problematical when auxilliary lift pumps and filtration is installed, for the above reasons.

Several types of popular oem and auxilliary lift pumps are problematical, in that -

- the Carter pump is spec'ed by Carter for pusher-type service mounted near the tank, definitely not draw-type, as used on the Cummins - it will draw, but fails often due to cavitation with the easily-aerated Diesel fuel.

a. they are not flow-thru when failed

b. pressure regulators are not, by nature, flow-thru - blow a fuse, pump stops = no flow: zero fuel, none, nein, zip, nada, walla, squat, zilch, etc, ad infinitum

VP44 dies from heat or\and mechanical failure, CP3 simply runs outta fuel, insufficient for injection.

The Dodge '05^ in-tank fuel pump meets all the requirements for lift pump service -

- pumps a steady 9psi at idle and WOT at all oem power levels, fully suitable for the CRD HD optional power levels

- is pre-filtered in-tank

- is flow-thru when fail

- the 9-psi regulator is flow-thru when fail

- will supply 9psi at 2gph or ~70gph thru the factory filtration media

Thus, it is good for both systems, incl the earlier VP44 systems which requires hi-volume flow rates to cool the driver module

For those addicted to the hi-dollar aftermarket systems, remember -

- if it fails in a VP44 system, you'll still need a replacement VP44 - pressure guage is highly important, here, as you all know

- if it fails in a CP3 system, just disconnect it, bypass it, and the CP3 will draw from tank and getcha home

BEARHUNTER

I just saved myself some problems and bought an amsoil lift pump

Speedfreaks101

Liftt Pump: A rarely seen beast that can spur interent arguments in just about any place a Cummins is present.

P.J

Thats about right.

Bark

LoL!!! Very good!

gmctd

I searched for an Amsoil lift pump to get the specs - couldn't find anything but liquids and paste on their site, Bearhunter - you gotta link, or can post the data from the pump?

BEARHUNTER

I dont know much about the amsoil lift pump, but i hear amsoil is great for just about everything in my truck, hell I might put some in my fuel tank! Sorry I couldnt resist.

Rod_Montana

GMCTD...

Excellent post. Too bad there isn't an alphabetical file on DTR where this type of knowledge is commonly available without the search function, which typically leaves you flailing through thousands of irrelavent, or suspect postings.

Bark

Yup, sure would be nice but It would be pretty time consuming for someone to set up.

gmctd

One of the Amsoil sales sites does offer a lift pump for the Cummins and Dmax from another vendor, Bearhunter, so I wasn't sure if that was humor or you were just happy that you were on top of things - sorry 'bout that - humor is much less humorous when ya gotta 'splain it...............

And, thanks, Rod - I still need to clean it up a little, but I don't see that info on any of the sites I frequent, so I thought I'd try it out on you guys in raw form