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Old 11-13-2014, 07:13 AM
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Smile Gas tank swapping?

Just got my 2015 JK Hard rock, and planning out what mods I want to do to her. Reading through the post to see what others are doing and noticed that the JKU’s have a larger gas tank, 22.5 gal. approx. 'I think", than the JK’s 18.5 gal. approx. I was wondering if anyone has swapped a JKU gas tank to a JK or if it is possible with little or no medications to make it fit?

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Old 11-13-2014, 07:29 AM   #2
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pretty sure your fuel tank and rear axle would be occupying the same space

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Old 11-13-2014, 07:34 AM
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That is what I was thinking, but was wondering why they would put a different size tank. Giving they would also have to have different program calculations for fuel consumption, i.e. miles remaining.
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Old 11-13-2014, 07:40 AM   #4
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Originally Posted by Tweak View Post
pretty sure your fuel tank and rear axle would be occupying the same space
Wolfgang Pauli does not take kindly to those shenanigans...
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Old 11-13-2014, 07:50 AM   #5
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That is what I was thinking, but was wondering why they would put a different size tank. Giving they would also have to have different program calculations for fuel consumption, i.e. miles remaining.
Its easier to pay a few developers basically one time to create some code for the system calculations than pay engineers to design/test and then manufacture a different configuration
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Old 11-13-2014, 09:55 AM   #6
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Its easier to pay a few developers basically one time to create some code for the system calculations than pay engineers to design/test and then manufacture a different configuration
I doubt that is the case. Its a difference of like 5 lines of code

#ifdef JK
#define TANKCAP 18
#elif JKU
#define TANKCAP 22
#endif

There. Done.
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Old 11-14-2014, 06:45 PM   #7
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You'd have to check but I think this would work in a JK since it goes where your stock muffler is (exhaust changes required obviously) and that area should be same between JK and JKU. It's expen$ive as hell but if you're serious about increasing capacity this would be a good way to do it. It's on my fantasy build list for my JKUR!

GenRight offers the best prices and customer service for JK Extended Range Gas Tank, Dual to be purchased online 24/7.
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Old 11-14-2014, 09:49 PM
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I saw the same thing. That's what got me thinking about the tank swap. Sure would be great to have the extra capacity.
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Old 11-15-2014, 04:31 AM   #9
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Wow. They are proud of that tank.
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Old 11-15-2014, 05:45 AM   #10
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There are several companies that make aux gas tanks that fit on the driver side under the jeep. Ties in to the fuel system for single point fueling. ARB sells one called the long ranger. I know there are also several others. The only problem is I have not found a U.S. Distributed yet for any of them. You have to import it.
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Old 11-15-2014, 08:06 AM   #11
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Ouch is all I can say. Price tag is a bit to steep, and not while gas cans are so cheap. Besides what are we really talking about another 60 miles of range?
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Old 11-15-2014, 09:49 AM   #12
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A lot more than 60 miles, at least for the gen right tank; it's a 20 gallon tank. Unless you get 3mpg.
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Old 11-15-2014, 10:08 AM   #13
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If your currently running the 18 some odd gallon tank at 17 mpg thee addition of a few gallons just does not seem worth the money or time to me
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Old 11-15-2014, 08:37 PM
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If your currently running the 18 some odd gallon tank at 17 mpg thee addition of a few gallons just does not seem worth the money or time to me
What Commodore Perry was referring to a new dual tank, adding an additional 20 gallons. An additional 20 gallons is more than double the J'S capacity. Though more than I can afford, having that kind capacity would be great for off roading trips.
I was referring to the stock JKU tank. I don't know the cost of a stock tank, but if the cost is negligible, than a extra 4 gallons without modifications might be worth it.

QUOTE="Commodore Perry;14805833"]You'd have to check but I think this would work in a JK since it goes where your stock muffler is (exhaust changes required obviously) and that area should be same between JK and JKU. It's expen$ive as hell but if you're serious about increasing capacity this would be a good way to do it. It's on my fantasy build list for my JKUR!



GenRight offers the best prices and customer service for JK Extended Range Gas Tank, Dual to be purchased online 24/7.[/QUOTE]
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Old 11-15-2014, 09:42 PM   #15
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Fuel capacity JK vs JKU

The fuel tank on both the JK and the JKU occupies the passenger side area between the drive line and the frame. It begins just after the transfer case and stops just prior to the rear axle. Since the JKU has a longer wheelbase, due to having four doors, instead of only two doors, that additional space enables the extra fuel capacity in the JKU.

Swapping fuel tanks between a JK and a JKU will NOT work because of this.

Putting a tank on the driver side could be done but would entail moving the evaporator canister at a minimum. You would also have to either work around the exhaust system or completely rerouting the exhaust to make room for the additional tank.

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Old 11-16-2014, 12:08 PM   #16
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Single axle tank trailer is the answer. Up to 230 gallons more fuel for range and detachable for trail running.

No need to add on increased rate springs, shocks, re-engineer exhausts, etc.

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