Is yer fuel tank starting to look like swiss cheese, bunkie?

[gmctd]

Catchy opener, right?

Problem being - the long Dodge fuel tank is mounted longitudinally in the chassis, with the fuel tank module mounted about halfway center - this is good for cornering, but when accelerating or decelerating at low fuel levels, the fuel will slosh to either end of the tank, uncovering the fuel pickup and allowing the lift pump to draw air into the fuel supply system - engine power tends to drop on a diet of injected air, said air being much less flammable than the expected fuel.

So - for those '03-'07 CRD Diesels experiencing fuel starvation at ~1/4 tank with the aftermarket high output lift pump systems and the multiple hole drillings amongst the fuel tank, here is a solution -

The '05-'06 Jeep KJ CRD Diesel uses the Bosch CP3 injection pump in the draw-from-tank mode - 'nuther words, there is no auxiliary lift pump installed in the fuel module in the tank - it is simply a strained fuel pickup and fuel return assembly, with fuel guage sender.
It is designed internally to eliminate foaming and aeration at the pickup point, and to supply fuel until the tank is empty - and it does so in the Jeep.

The beauty of it is, it is identical to the Dodge Cummins in-tank lift pump module, incl the fuel guage sender module - everything is identical: size, shape, electrical connector, fuel supply and return lines, and color - but the Dodge gets a pump, the Jeep doesn't.

Now - if the unused Dodge lift pump module was removed, and the Jeep module installed in it's place, your fuel supply and return problems would be solved, as the module is engineered for remote, outside the tank, lift pump service - no bubbles, no air pockets, no starving for fuel, no running out of fuel B4 the tank is MT.

Whadda deal - and all for only $96bucks at yer local fuel module emporium.

Try it - you'll like it................


'06 Dodge on the left, '05 Jeep on the right (ignore the '06 Dakota test-gasket on the Dodge module - Dodge and Jeep Diesel tanks use an o-ring seal, instead)

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If it's a Diesel thing, I do understand..................
96 Dodge 3500 CC 2wd drw 3.54\6sp 5.9\12v TST#10 SBC13" '05-17"whls Buckstop
DODGE makes it - CUMMINS shakes it; 6 in a row makes it go

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Last edited by gmctd : 01-14-2008 at 10:27 AM.

[gmctd]

BTW - that Dodge module has recently taken up residence in our Jeep Diesel - and you get the benefit of the intense R&D

And now, the Jeep part number

__________________
If it's a Diesel thing, I do understand..................
96 Dodge 3500 CC 2wd drw 3.54\6sp 5.9\12v TST#10 SBC13" '05-17"whls Buckstop
DODGE makes it - CUMMINS shakes it; 6 in a row makes it go

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Last edited by gmctd : 12-08-2007 at 08:17 PM.

[Sandaholic]

So use this instead of the draw straw? And if your aftermarket pump ever fails just bypass it with some hose and the cp3 should be able to pull fuel from the tank by itself. Do I have that right?
I like it if so!

__________________
2005 2500 SLT 4x4 QCLB 6spd intake juice att. S-06 6" aussie stack airdog 150 liberty fuel can mod mag hytec rear diff. cover 6" lift 35's pulls lifted 10,000 lb. dry fifthwheel toyhauler

[gmctd]

Correct - the CP3 will pull 20" vacuum on the line to the tank, drawing fuel - the Jeep doesn't have an aux lift pump, always running in the draw-from mode - depending on the a\m pump, if it is drawthru-type, the CP3 can draw fuel thru it without the bypass - any 2micron filters will add some restriction over the oem 10micron.

Even if it won't win any races, it'll still getcha home................

__________________
If it's a Diesel thing, I do understand..................
96 Dodge 3500 CC 2wd drw 3.54\6sp 5.9\12v TST#10 SBC13" '05-17"whls Buckstop
DODGE makes it - CUMMINS shakes it; 6 in a row makes it go

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Last edited by gmctd : 12-16-2007 at 01:03 PM.

[itr.#1446]

damn wish i knew this the other day when i installed my fass, i live in a town where there a hills theat even a 1/2 my truck would not get fuel from the draw tube.

Quick question now if i put this in does anyone have any suggestions on what to use to seal up the hole i made putting in the FASS draw tube?

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2005 Dodge ram 2500 fass 150/150, cfm intake, k&n intake, 4 inch exhaust, edge juice w/attitude, kore recon lift, ssi track bar and steering brace, 20' hoss wheels with 35x13.5 mickey thompson baja a/t's

[gmctd]

Wooden dowel with black RTV in that bulkhead fitting that came with the kit - or aluminum dowel - or crimped over and soldered copper tubing

Anything that will fit that bulkhead-type fitting - could even tap it for a pipe plug

__________________
If it's a Diesel thing, I do understand..................
96 Dodge 3500 CC 2wd drw 3.54\6sp 5.9\12v TST#10 SBC13" '05-17"whls Buckstop
DODGE makes it - CUMMINS shakes it; 6 in a row makes it go

[CCIE]

How does the Jeep module draw fuel into the cup where the pickup tube is? I know the diesel module draws it in with the factory electric pump

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07 5.9 QC Auto

[gmctd]

Good question - it's simple Science 101 - the CP3 has a very powerful draw-type lift pump, pressure-regulated, excess output bypass feeding a return line into the cup - when fuel volume is lower in the cup than the level outside in the tank, the greater mass of fuel outside forces the flapper valve in the bottom of the cup open, allowing the liquid to seek it's own level, thus equalizing inside\outside level - also has help from the return line in maintaining that inside level, again based on the weight of the fuel inside the cup vs that outside the cup as tank level drops.

Same thing happens when the fuel inside is foamy - liquid fuel has more mass - greater weight - than foamy fuel: the level will equalize

'Nuther words, yer cup may have a nice head on it, but it'll be a cup full of fuel, eh?

Thus the cup level is always more than sufficient to keep the pickup intake submerged and 'wet' down to MT tank - "E" on your guage

If you're concerned about hot return-line fuel effecting power loss, just add a cooler to the return-line to lower fuel temps to ambient - DeRaille has some nice fan-over coolers, or create your own from summitracingdotcom, etc.

You will need to increase supply-line size as you head toward 900hp, but the module will still function - should be no hill to replace the 3/8" oem line with 5/8" bulkhead fittings to increase line diameter to the pickup

Try it - you'll like it...........

__________________
If it's a Diesel thing, I do understand..................
96 Dodge 3500 CC 2wd drw 3.54\6sp 5.9\12v TST#10 SBC13" '05-17"whls Buckstop
DODGE makes it - CUMMINS shakes it; 6 in a row makes it go

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Last edited by gmctd : 12-17-2007 at 12:30 PM.

[john cymbala]

Thanks , good imfo

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2003 6spd , luk ceramic clutch, tst, , 5" exhaust, high tech 62-12 turbo 10 mic/absolute 2miccron catipeller spec filters, blue lift pump,6" lift bfg 37's,65 gal sattle tank, autometer fuel pres,poro,boost gauges, sp rail presure

[BBRam]

Thank you gmctd, I moved this to the 3rd gen. Tech Articles forum.

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03-3500, DRW, QC, 4x4, DTT Trans, Mag-Hytec, R700 BD Twins, BD IC Boots, BD Billet Flexplate, Lockup Switch, SMARTY TNT-R BETA/TS MP-8, Eliminator Fuel System, Floor It Stage 3 CP3 & Rail Cap, BIG Stix's by FTE, ARP Head Stud's, Springs, Fluidampr, ATS ARC-FLOW, AFE, Boost, Drive Pressure, Pyro, Fuel Pressure, Tran's Temp, Rail Pressure Gauge, GDP Ladder Bars, GrandRock 7" Miters. Old #'s (R/T .021, 60' 1.76, 1/4 ET 13.14 @ 100.45 mph)

[gmctd]

Stay tuned - enhancements as available

__________________
If it's a Diesel thing, I do understand..................
96 Dodge 3500 CC 2wd drw 3.54\6sp 5.9\12v TST#10 SBC13" '05-17"whls Buckstop
DODGE makes it - CUMMINS shakes it; 6 in a row makes it go