I have a 2011 F-250, 6.7L. I work at an airport and have access to about all the jet fuel I can use. Several co-workers with older diesels run it almost exclusively with proper additives. I was wondering about the 6.7L.

Any thoughts would be appreciated.

 

"With proper additives" is probably the key. During Desert Storm, all we had was jet fuel and it destroyed the mechanical pumps in our trucks and heavy equipment. We started adding a 55 gallon drum of straight 40w motor oil to each 1,200 tanker we would fill and that helped quite a bit, but we still lost pumps frequently.
I personally would not chance it with this engine - specifically with this pump. If something goes south with trying to save money on fuel, you're looking at a potential $12,000 repair bill that will not be covered under warranty. I'm not sure that insurance would even cover the repairs if you willingly and knowingly put the wrong fuel in your tank. It is an interesting thought though.

 

It would be wiser to just spend the $4,000 on an old beater 7.3 or the cummins 5.9 and drive it around. Lots cheaper, no risk.

 

We ran that fuel in our 1151 and 1114 humvees in Iraq (07-08)I wasn't a mechanic so I wouldn't know and I don't know if they added oil to the fuel, I guess they did something to the motors to let them handle that fuel, don't know.

 

Don't run JP8 in an emissions controlled diesel.

JP8 doesn't meet the same standards as diesel fuel regarding sulfur content, lubricity, and cetane index. Additives can correct the lubricity and cetane, but it won'd do anything for the sulfur content. At that point you risk problems with the DPF and EGR systems.

Old diesels without all the emissions junk can do just fine with additives. That's why you see your buddies getting away with it and not having problems.

 

Here's something that was posted up a couple of years ago. The military tested the 6.7L engine on various fuels including JP8. Here's the abstract:

"A large number of current commercial off-the-shelf (COTS) diesel engines available to
the U.S. Military employ High Pressure Common Rail (HPCR) fuel injection systems. Overall
performance and endurance of these HPCR systems has the potential to vary with use of military
or alternative fuels. Testing was conducted using the Ford 6.7L diesel engine to determine the
impact on engine and HPCR fuel system performance with the following test fuels: diesel (ULSD),
JP-8, 50%:50% volumetric blend of JP-8/Synthetic Paraffinic Kerosene (SPK), and 100% SPK.
The U.S. Army 210-hr Tactical Wheeled Vehicle Cycle (TWVC) engine endurance test was used to
determine engine and HPCR system performance. Engine performance over the test duration, preand
post-test powercurves and post-test fuel injection component inspections were used to
determine each fuels performance.

 

Great read Tom. Thanks for the info....

 

Tom, Your a wealth of info. Thanks

Reps Sent

 

Tom, Thanks for sharing.
Interesting !

 

No, but I have run ULSD in my SR-71.

 

Only JP-8 in my U-28!

 

I run super unleaded in my lawnmower.

 

As others have said, I wouldn't risk it. Tom provided a great link with some awesome data - the only thing I would worry there, is it looked like they only tested the engine for 210 operating hours (unless I read it wrong). My concern would be continual use of the HPFP with lower lubricity fuel.

 

Also to add is that the tests included no emissions equipment.... no EGR, no DPF, and no DEF.

 

I'm with Adrian on this one... When I read the report, I thought the duration was too short to show any appreciable enhanced wear in the HPFP components.