OK, I have gotten the eco-tune, torque converter and fuel heater so far. As long as I keep the primer pumped up firmly I get fair mileage. Kinda sick of messing with it so I am going to try the last thing on my list which is a fuel pump. My question is, do I absolutely have to use the in-tank pump or is there one I can mount between the tank and fuel heater that will work? Seems something "in-line" should work just as well and be easier to install. Thanks for your help!

Willmc

There is a kennedy inline lift pump available. Mine no longer works and I still get great mileage. I do not think it is necessary have. What MPG are you getting?

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2006 Liberty CRD 275K, JBA 2.5 with Fox Shocks, GDE Turbo Kit, GDE TCM Tune, Suncoast TC, OEM fuel filter housing converted to fit Caterpillar Fuel Filter 1R-0749, OEM themostat housing modified to accept Hemi 203 F thermostat.

I am getting 22-24 with mostly highway miles. I drive 61 miles 1 way and would like to keep this thing but would like to break 25 mpg if possible. The hand primer gets soft after a while and have had a couple of hard starts and it runs rougher the longer I go between bleeding the system so something is up. I figure pushing the fuel to the filter/heater should take care of it.

Willmc

I have a long commute too, 60mi each way. I was getting 22-24mpg as well. I cleaned all the soot off my MAP sensor, bumped up the air in my tires to 38psi, and disconnected the MAF sensor (ORM), I now get 26-27mpg routinely, and as high as 29.5 if I drive 65mph. Just thought id throw it out there in case you havent done any of the above, though with the eco-tune you shouldnt need the ORM. I only have 15k miles on my fuel filter/heater assembly, I had rough starts and it died on me one day, replaced that, an easy 30min job, so it may be that for you too.

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2006 CRD Stock with ORM and a clean MAP (always)

An in-line lift pump works well. There is a possibility of still getting air in the system from the joints at the fuel tank itself, but the in-line pump will help push those through the fuel filter. I am using a Mr. Gasket pump (12D) and it works just fine, way cheaper than many of the others. The cheap Facet's should work as well.

I don't think, however, that there is much of a nexus between fuel economy and a low pressure fuel pump. The fuel pump may cause it to run smoother and quieter, but that's all I would expect.

As to your economy, are you relying on the EVIC numbers, or are you calculating by hand? On the highway (long trips) my EVIC reads 31-32 mpg, going to work it reads around 27, and around town it shows 22 or so. My hand calculated numbers are usually slightly higher. Try hand calculating and see what you are actually getting.

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2005 Liberty Limited CRD; Air Filter Monitor; Samco Hoses; GDE HOT Tune; RL037142AA TC; KJ Interior Rack from All J Products; JBA Adjust-a-strut lift and A-Arms; 245/75R16 Firestone Destination ATs on Moabs; ARB Bumper; ASFIR Skids; FS-2500 Bypass Filter; ARP studs.
2016 Grand Cherokee Overland CRD.

have you checked to see if you have a brake slightly dragging? also what type of tires do you have? I regularly have gotten 30mpgs after the GDE eco tune but before that I was getting a best of 27. I am happy with mine now

I have bumped the tire pressure, cleaned the MAP, had a brake job and put the new fuel filter/heater on. Basically I have done everything that the noob guide said to do with the exception of the lift pump.

I may just try the inline pump you mentioned here. I have had air in fuel issues on other diesels and it seemed to help my fuel economy as I fixed them. The best example was on an 01 F250. Put the fuel return system and airdog on it and got a smoother, better running and more effecient truck. Wish I still had the thing!


I don't have the EVIC. All my numbers are hand calculated. I am a little disappointed as I have wanted one of these for a long time. I will probably keep it for a hunting vehicle but if the pump doesn't help I may buy a VW Passat. Used to have an 03 Jetta tdi. It was one of the best I have ever owned.