I found this buried in my notes per gmctd didn't bookmark the thread though

"CAUTIONARY NOTE: Unofficially, engineering has indicated aux lift pump pressure of only 5psi has resulted in excessively rich fuel\air ratios in the DCX CRD R&D Lab, causing black smoke and rough running - engine resumed normal operation when aux pump was removed - further information may be forthcoming - or, not."

_________________
06 Jeep KJ CRD Sport full Mopar skids, front tow hooks, rear hitch shackle, Magnaflow muffler, Samco Sport CAC hoses, 02 Airbox mod, Unique series 42 steel wheels.

I wish it was true...I could go for some good 'ol "black as coal, six days on the road and I'm a gonna' make home tonight," smoke.

_________________
05 KJ CRD Limited..
08 WK CRD Laredo
03 DR 2500 Cummins
13 Edge Limited AWD

Early on, Mr Mopar64 indicated the 2.5\2.8L CRD in their test cell had smoked after adding a ~5psi aux lift pump, did not B4, nor after it was removed - no Dodge Cummins CRD has done so with the factory 9psi intank pump prior to owner interference, so I forged ahead - so far, no aux lift-pumped KJ CRD on the street has done so - guess my forgery passed the litmus test, eh..............

_________________
'05 CRD Limited
Pricol EGT, Boost
GDE Hot '11; EDGE Trail switched
SEGR; Provent; Magnaflow;
Suncoast T\C, Transgo Tow'n'Go switch;
Cummins LP module, Fleetguard filter, Filterminder
2.5" Daystar f, OME r; Ranchos; K80767's, Al's lifted uppers
Rubicons, 2.55 Goodyears
Four in a row really makes it go

MrMopar64 was using a nonstandard injector pump - for his dyno testing
The results didn't transfer to the standard system.

_________________
2005 CRD
stuff
Skeptic quod gratis asseritur, gratis negatur

wait a minute..did I miss something in translation..

so a lift pump is bad?? I don't follow the reasoning why..black smoke and poorer mileage..this doesn't make since
since the CP3 draws a vacuum..might cause air bubbles to form in the process.. then pressurizes the fuel to 80+ PSI

so how does putting 5 psi to the input of the put cause black smoke and poor mileage?

-dkenny

_________________
84 BB school bus, DD8.2L turbo ->the transmission died..too expensive to fix..it'll be heading to the scrap yard..4/11)..Bus gone to Scarp 8/23/11
06 Liberty CRD
'99 dodge ram 2500 quad cab, 4x4, 24v
all Biodiesel powered when its warm enough

It doesn't. Dozens of us have shown that as of now.

_________________
05CRD: GDE Hot ECU & TCM tunes, Provent, Cat filter, Facet lift pump, TransGo kit, Florida TC, Samcos, stainless brake lines, HDS thermostat, Renegade light bar,
RL super sliders, Bilstein adjustables, Al's Gen 4.5 Arms, 235/85-16 Duratracs, DTT rear, Elocker front, EVIC+TPMS, Turbo timer, McNally pillar gauges, Weeks Stage II kit.

i might just be soon on the list of positive pressure is good...

just a matter of time and effort..

so far all posts indicate that a pressurizing lift pump would be good..so I'llkbe adding one soon..and a pressure/vacuum gauge on the fuel line.


-dkenny

_________________
84 BB school bus, DD8.2L turbo ->the transmission died..too expensive to fix..it'll be heading to the scrap yard..4/11)..Bus gone to Scarp 8/23/11
06 Liberty CRD
'99 dodge ram 2500 quad cab, 4x4, 24v
all Biodiesel powered when its warm enough

Hmmmm - don't recall seeing that in open forum -

Anyway, vacuum is good - vacuum reduces surface tension, reducing aeration - that's why your KJ came with a draw-type fuel system - unfortunately, all the components btween tank and CP3 are not vacuum rated, so you also get air, more or less - lift pumps are good.......long as they do not overpressure the COV, which, in our CP3, is calibrated on 0psig inlet pressure - Dodge Cummins is calibrated on ~9-12psig inlet pressure - DMax is calibrated on 0psig inlet pressure - at least, that's the way they came off the production assembly line - leave it to Dodge owners to jack a 30-45psi lift pump in there, and immediately start complaining about internal leaks and shoddy manufacturing techniques..................

_________________
'05 CRD Limited
Pricol EGT, Boost
GDE Hot '11; EDGE Trail switched
SEGR; Provent; Magnaflow;
Suncoast T\C, Transgo Tow'n'Go switch;
Cummins LP module, Fleetguard filter, Filterminder
2.5" Daystar f, OME r; Ranchos; K80767's, Al's lifted uppers
Rubicons, 2.55 Goodyears
Four in a row really makes it go

That's why i thought the Holley at 15psi was to much,im not running a aux pump at the moment but before mine blew after jump starting i had no black smoke but a firm plunger on the filter head.

I haven't felt the need to replace the pump and seldom bleed any air, perhaps i'm fortunate.

_________________
06 CRD LTD ( Euro )

I install the Master E8012S with the Racor Filter. When I open the Switch it give me a 9PSI, when it run it give me about 3 to 4# at idler; maybe les when it has RPM. The good thing about it is that it is a free flow pump and when is off act as a check valve, not letting the fuel go back to the tank.

yep..so a small positive pressure would be good..
just your sure I agree that too much pressure is bad.. on the liberty or a cummins common rail..mine not the commone rail but I still think too much pressure is bad.

I'd like to have the Jeep run 5 psi max. this would help keep the air out of the system and with an manual switch make changing the fuel filter easier.

-dkenny

_________________
84 BB school bus, DD8.2L turbo ->the transmission died..too expensive to fix..it'll be heading to the scrap yard..4/11)..Bus gone to Scarp 8/23/11
06 Liberty CRD
'99 dodge ram 2500 quad cab, 4x4, 24v
all Biodiesel powered when its warm enough

What does that CRD in your sig mean?

_________________
'05 CRD Limited
Pricol EGT, Boost
GDE Hot '11; EDGE Trail switched
SEGR; Provent; Magnaflow;
Suncoast T\C, Transgo Tow'n'Go switch;
Cummins LP module, Fleetguard filter, Filterminder
2.5" Daystar f, OME r; Ranchos; K80767's, Al's lifted uppers
Rubicons, 2.55 Goodyears
Four in a row really makes it go

Okay, so I am getting ready to put a lift pump in. I don't have the time, money or patience to do the Cummins in-tank mod, so I am just going to install a universal one near the tank. Here are questions that I need answered (and sorry if they are posted somewhere in the "Where's your lift pump" thread. I didn't have the time or patience to re-read the 500+ posts in that thread.):

What size is the fuel line that I need to splice into?
Which line is the output and which is the return (or is it obvious)?
Which pump? (I know that there are alot of opinions out there but let me narrow it down; I can't afford a Kennedy or that is the way I would go. It needs to be self priming, self regulating, and free flowing on failure.)
Can I just splice into the wiring harness in the same place as the guys that have done the Cummins mod did?

Any help would be greatly appreciated!!

_________________
'06 Stone White, CRD Limited
CRD Frankenlift II, Rock Lizard Rear Bumper, Mann Provent, GDE FT-ECO Tune, "Euro Torque Converter, Transgo 545RFE-H2 Shift Kit, 245/75 MT/R's on Moabs, Full Mopar Skids, Front Tow Hooks, CAT 2 Fuel filter and bleeder valve mod, Fumoto valve, Wahlbro Lift Pump, Custom 2 1/2" Exhaust

What size is the fuel line that I need to splice into?
Can't remember.
Which line is the output and which is the return (or is it obvious)?
Can't remember

Which pump? (I know that there are alot of opinions out there but let me narrow it down; I can't afford a Kennedy or that is the way I would go. It needs to be self priming, self regulating, and free flowing on failure.)
I used an Airtex brand Duramax replacement pump. About 40 bucks

Can I just splice into the wiring harness in the same place as the guys that have done the Cummins mod did?
Yes.

_________________
Manure green 2005 CRD sport4x4, GDE Hot tune, Cat Gut, OE skids, Draw tight hitch, Duramax lift pump, 160K on multiple varieties of fuel, XM radio, Escort live with Redline, fog light mod, GPS, Icom IC7000 all band radio call sign KC9QPF, Grabber AT2s on Soft 8s, FIA grill blanket.

Return line is small - supply line is not small

_________________
'05 CRD Limited
Pricol EGT, Boost
GDE Hot '11; EDGE Trail switched
SEGR; Provent; Magnaflow;
Suncoast T\C, Transgo Tow'n'Go switch;
Cummins LP module, Fleetguard filter, Filterminder
2.5" Daystar f, OME r; Ranchos; K80767's, Al's lifted uppers
Rubicons, 2.55 Goodyears
Four in a row really makes it go

I unplugged my fuse when I went to the dealer to have my filter head replaced and the CP3 sucked the fuel through it. When I got my CRD back, I plugged in the fuse and it ran fine showing no problems.

_________________
2006 Pearl Green CRD
Magnaflow 2 1/2" Cat Back
KJ Extra Leg Room Brackets, Carter Lift Pump, V6 Airbox, ORM
Fuel cooler, Oil Separator, Progard 7
Gauges EGT Boost Trans Temp Oil Pres, Michelin LXT AT2 245 70 R16
7,000# Draw Tight hitch, PML EX Deep Trans Pan
Centrifuge, SunCoast, Transgo, RAM TCM, InMotion Stage 2
Wife's 99 TDI VW Beetle

I recommend the Walbro FRB-11. http://www.autoperformanceengineering.c ... pumps.html

I installed the in-tank on our Liberty for that OE warranty-friendly style but used the Walbro on our paid-off TDI.

See the link for specs, the Walbro can be mounted under the hood if you want to, that is where it is in my car.

$110 shipped, >18,000 hour duty life, Made in the USA.