I have a 2001 Sport, have owned it for about 7 months. My wife ran it dry one day and I still only managed to get a little more than 17 gallons in it. I thought these things were supposed to have 20 gallon tanks? The previous owner was the Montana Department of Transportation so I know it wasn't modified/changed in anyway. Thoughts?

 

Look up a build sheet from Chrysler using your VIN, that will give you an answer to any questions you will have about your Jeep, including this one.

XJs had different size tanks in them through the years. It also has to do with what engine you have and what trim level your XJ is.

 

I filled out the request, thanks, didn't know I could do that!

 

Not a problem!
I've asked for one several times. It's definitely a good thing to reference.

 

Got the report, it says 20 gallon tank, I wonder why I only get 17 in it, those extra three gallons would really help on road trips.....

 

The tank has a vent tube that won't let you put more than 17 gallons in it. I don't know why they did this. I did the fuel tank mod and got 26 gallons in it from a dry tank.

http://go.jeep-xj.info/HowtoFuelTank.htm


The only problem is, gasoline expands. If I fill it completly it will flow back out when it sits in the sun. I only fill it all the way when I'm travelling.

 

Two thumbs up on the vent mod!

 

That seems odd to me. I'll have to check out that mod a little further. I need more capacity for sure. Right now I can maybe get about 320 miles on the highway and like 250 in town, that just doesn't cut it. What I don't get is that they list it as a 20 ga. tank, you can only get 17ga. because of the vent tube, but when you mod the vent tube you can get 25+ gallons?? WTF?? Why would Jeep set it up this way....makes no sense to me, I understand the expansion thing but really?!

 

Oh I just realized this is in the wrong place, should be in OEM tech not Advanced tech. MY BAD!

 

That vent tube mod wont work on your or my tank, we have 97+ plastic tanks I wish I got the mileage you are getting, I am lucky if I break 220 on mixed highway and city

 

Well that sucks.....I guess I have to save my pennies and buy an aftermarket tank. I would really like another solution that wasn't gonna cost me $1000. And I don't feel like carrying a bunch of jerry cans with me everywhere I go.

 

Would it be possible to swap out my tank for an older, metal one that I can do the vent mod on?? That would be cheaper than buying a lager, aftermarket tank.