JP-8 in a 5.9 Cummins

[CumminsSoldier04]

I'm sure this has been a topic on here at some point but just getting some more opinions on this subject.

I know JP-8 is aircraft fuel we use in our military vehicles. I know this because i'm around it everyday.

My question is what; if any problems would it give my truck if i were to put a gallon or so of JP-8 in it?

The fuel is refined and filtered on our hemmett fueler before it even touches the vehicles so its clean and water free. I understand that with JP-8 water is harder to get out of JP-8 and our stock filtering systems wouldnt do a good enough job to keep the water from entering the combustion chamber.

So if anyone has tried it or know of anyone who has put some infor on here.

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2004 Dodge Ram 2500 QC LB H.O. (305 HP) CFM + intake manifold, 4inch Silverline Turbo Back Exhaust, AEM Brute Force HD Intake system, ISSPRO Gauges (Boost, Pyro, Trans), Custom grill inserts, Recon smoked cab lights, Predator Power Puck

[5alive]

I doubt it would hurt anything, but I believe JP-8 is closer to being kerosene than the diesel that we normally use. I believe all the JP-X are in fact. Along that line I'd guess it would reduce the lubricity of the diesel you have in the tank which isn't a good thing. Not that there's a huge difference between diesel and kerosene and jet fuel, but it could be enough to cause trouble. OK, I'm done making stuff up now

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2005 SLT Reg Cab DRW 4X4 48RE

[04Cummin3500]

i dont think it would hurt it, we run it in the hmmwv's and the mtvr's which have the cat c12, and then run diesel when were convoyoin up to fort hunter ligget, ive thought about it before, but i defueled a few vehicles wit the jp-8 in it and it was green, so i dont think i would put it in my truck, im not sure if we have that spiffey filtration system here lie you guys do. the government spending isnt to high for us were just navy seabees

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[CumminsSoldier04]

thats why whenever we fill up outta the fuel hemmetts we put about a gal of 15w-40 in with it, to help with lubricity. I'm pretty sure this stuff would clean up the injectors as well as the rest of the fuel system

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2004 Dodge Ram 2500 QC LB H.O. (305 HP) CFM + intake manifold, 4inch Silverline Turbo Back Exhaust, AEM Brute Force HD Intake system, ISSPRO Gauges (Boost, Pyro, Trans), Custom grill inserts, Recon smoked cab lights, Predator Power Puck

[navman28]

In fact, with no required cetane number specification for JP-8, ignition delay times are 25–50% longer for this 38-cetane-number JP-8 fuel sample compared to a 46-cetane-number #2 diesel sample.

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06 2500 5.9 QC 4x4, 48RE, K&N, MBRP Dual Exhaust, 35" Pro Comp Xtreme AT, 3" TGC Lift, Smoked Recon Cab Lights, MP-8, Street Scene Grill, ISSPRO EV2 Pyro, Trans Temp, Rail Pressure Gauges

[carl48]

we got a lot of jp8 fuel when we replaced a bunch of tanks at the airport one tank had a bad hood and they were afraid to use it. there was 11,000 gallons of fuel in it. there is no lubrication in the jp8 at all. there is no bio diesel in our area so we used 2 cycle oil and non synthetic dextron atf in the jp8 and then diluted that with diesel. we did 25% jp8 to 75% diesel. nice winter mix

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[04Cummin3500]

so im guessing straight jp8 is horrible on injectors and fuel pumps them, since there is no lubrication properties to it?

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[Savva]

yeah i dont see a problemi just got back from Afghanistan and we used jp-8 in our hmmwv's mraps pls's and hemmits.... oh yeah now that i think of it we used it in out generators too.

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2004 3500 triple nickle 6 speed MBRP 4 inch/ south bend clutch/ short shifter/ 4.5 inch lift....cosmetics

[04Cummin3500]

yup same here also were u at camp bastion by chance?

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2004.5 Dodge Ram3500 2WDQCLBSRW.Edge Juice/attitude, AEM Brute Force Intake,BHAF,Straight Piped,Leveling Kit,Silencer Ring MIA,ProComp ES9000 Shocks,S&B Intake Horn,CST Lift,33x12.50 M/T ATZ USN SeaBees "We Build.We Fight" NMCB 5

[DRTDEVL]

Originally Posted by Savva

yeah i dont see a problemi just got back from Afghanistan and we used jp-8 in our hmmwv's mraps pls's and hemmits.... oh yeah now that i think of it we used it in out generators too.

And all of you who do not see any problem with it have not been in the military long enough to know the difference.

When I was a young private, the Army still used DF2 in all vehicles. Sometime around 1998(?) the switch to JP8 was made. Back before the JP8 days, HMMWV's would run fine for YEARS on the original IPs. My M915 tractor was still on it's original IP after over 1,000,000 miles of service (NTC400 Cummins). As soon as the switch was made, I noticed an alarming trend... The IPs were dropping like flies in the entire fleet's HMMWVs, followed by every other vehicle in the inventory.

I asked several people why the change was made with all the issues and no one had the answer... Until I ran across an old SFC fueler (77F at the time, now 92F). He informed me that at the time of the switch, the military could procure JP8 for about $0.23/gal, as opposed to paying $0.79/gal for DF2. When burning millions of gallons of fuel every month on a shrinking budget, this actually made sense. At the time of the switch, the military was saving $0.56/gal on fuel, reducing their fuel expenses by 71%.

Now over the years, the military has stuck to this method of procurement, but there is a problem. Due to the sudden extreme increase in demand for JP8 after the switch followed by further increases in demand due to two consecutive wars being fought, the price skyrocketed past DF2. Now the military pays a hair over $4.00/gal for JP8, when we could be fueling our rigs with DF2 for about half the cost.

So, the pros are (were): (Lower cost), less soot, cleaner burn.

The cons have always been: Lack of lubricity burning IPs, lower Cetane ratings cause harder starts and lower power output, lower BTU's contribute more to lowering the engine's power, lower power is lowering fuel mileage, and the inherent additional danger that comes with transporting a fuel with a lower flash point (DF2 @ 52*C/126*F, JP8 @ 38*C/100*F). Yup, JP8's flash point is lower than the normal high temperature in Baghdad 6 months out of the year!



In conclusion, I would NEVER run JP8 in anything I personally own!

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[04Cummin3500]

good info, the 4 years i have been a crane/heavy equipment mechanic in the navy seabees, running jp8 in our vehicles havent seen a single injector or ip go out? did the military finally get smart and have the company like am general and cat put modified parts in the vehicles to keep them from burning out pumps or injectors? oh and on a side note, the only time we realy ever use jp8 is out in the desert, but some of our pieces actualy require jp8 insted of diesel i.e. red fuel cap =jp8 black fuel cap=diesel its marine proof

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[DRTDEVL]

It was never required of the manufacturers to make any changes, but most did in order to save big time on warranty parts.

Most newer vehicles can run fine on JP8, the only side effects being lower power (the military never minded us going slower for "safety") and higher operating temps. In fact, I have noticed the trend lately of vehicles stating "JP8 ONLY" on the fillers, rather than "DIESEL FUEL ONLY", but if you look at the fuel system, there is no difference than the commercial applications. The biggest problem in some vehicles is that switching back and forth between the fuels actually clogs the filters with a quasi-gelling effect, and there is no "defrosting" it. Gotta change the filters to run it again. That's the only reason I could see a vehicle requiring JP8 only.

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