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13.5 to 20 Gallon Fuel Tank

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Old 03-09-2016, 10:48 PM
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Default 13.5 to 20 Gallon Fuel Tank

So I am getting ready to upgrade my tank from the 13.5 to the 20 gallon. Besides the obvious tank, straps, and a new fuel sending unit, what else needs to be involved? Thanks in advance.
Old 03-09-2016, 11:21 PM
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Default 13.5 to 20 Gallon Fuel Tank

It's even easier. They are the same tank. Cut your filler neck shorter so it will fill more. If your careful you can get it to 25 gallons I believe.
Old 03-10-2016, 07:51 AM
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Originally Posted by toasterknight
It's even easier. They are the same tank. Cut your filler neck shorter so it will fill more. If your careful you can get it to 25 gallons I believe.
Actually, just get the sending unit assembly for a 20 gallon tank.
Old 03-10-2016, 12:43 PM
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Really? I though you had to trim the neck in the tank?
Old 03-10-2016, 01:28 PM
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Originally Posted by toasterknight
Really? I though you had to trim the neck in the tank?
Nope. That's for something else.
Old 03-10-2016, 05:14 PM
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What?? Was this 13.5 Gallon vs 20 Gallon just a scam to get people to pay more for the same actual tank? Bad Chrysler!
Old 03-10-2016, 05:51 PM
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Originally Posted by Morat
What?? Was this 13.5 Gallon vs 20 Gallon just a scam to get people to pay more for the same actual tank? Bad Chrysler!
If so, Chrysler was out ahead of it. I had a 2005 Toyota that didn't have the up model's day time running lights..... Until you put the missing fuse in the block. Car makers are sneaky.
Old 03-10-2016, 05:53 PM
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Originally Posted by Morat
What?? Was this 13.5 Gallon vs 20 Gallon just a scam to get people to pay more for the same actual tank? Bad Chrysler!
Yes it was. They did the same thing with the wrangler as well.
Old 03-10-2016, 09:24 PM
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It was Jeep, not Chrysler that did that.
Old 03-10-2016, 11:24 PM
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OK, new stuff for me. Yall' are sayen the cap. of the tank is being limited by the filler protruding down to limit filling?
Old 03-11-2016, 06:16 AM
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No. The pick up tube is shorter on the 13.5 gallon tank and the sending unit is different. It holds 20 but you can only get 13 out.

Last edited by cruiser54; 03-11-2016 at 03:59 PM.
Old 03-11-2016, 09:12 AM
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This makes total sense. I've been looking at the tanks thinking, did they just make the inside smaller and keep the outside the same size? lol

Ok so fuel sending unit- anything else I should be looking out for while I'm up in there?

Thanks!
Old 03-11-2016, 12:02 PM
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Originally Posted by cruiser54
No. The pick up tube is shorter on the 13.5 gallon tank. It holds 20 but you can only get 13 out.
So 7 gallons of gas is always sitting in our tanks that we cant access?

This has me lost!
Old 03-11-2016, 12:53 PM
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Originally Posted by g1teg
So 7 gallons of gas is always sitting in our tanks that we cant access?

This has me lost!
they're talking about the renix XJ, so I'm not sure if it's the same thing as your 99 where the fuel tank was changed for a plastic one with other things also changing.

maybe they did the same though, someone can probably confirm whether or not what I'm saying is true or not, I'm only guessing.
Old 03-11-2016, 12:57 PM
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Originally Posted by Cane
they're talking about the renix XJ, so I'm not sure if it's the same thing as your 99 where the fuel tank was changed for a plastic one with other things also changing.

maybe they did the same though, someone can probably confirm whether or not what I'm saying is true or not, I'm only guessing.
My 99 does have a plastic tank - Holds roughly 60L or ~16 Gal


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