egghead Posted September 22, 2006 Share Posted September 22, 2006 I was wondering how I would tell the difference in a 20 Gallon gas tank and a 13? Did the 13 only come in the Short box MJ's and the 20 in the Long? The previous owner of my MJ put a different sending unit in it; since then the gas gauge has been off. Way past full is full, Full is half, and half is quarter. Since my fuel pump went bad on me i'm going to replace the sending unit also, but I need to know the size of tank I have. Thanks for the imput Egg Link to comment Share on other sites More sharing options...
Kenosha Warrior Posted September 22, 2006 Share Posted September 22, 2006 SWB manches had the smaller tank. my canadian manual says 18 gallons, unless its been swapped out, or he swapped in a mismatched sending unit, it should have the smaller tank. Link to comment Share on other sites More sharing options...
GirsMJ86 Posted September 22, 2006 Share Posted September 22, 2006 my 88 swb had an 18 gal tank, not sure of the other size option for swb, and i am not sure what my new swb has in it. my 86 lwb has the 23.5 gal optional tank, the small stock tank is 16.5 gals or sumthin stupid like that IIRC. i would have to look in my manual for sure though. y not run it down as far as you can and then go fill it up? see how many gals u can fit in it then see what it is closest to? just my $.02 8) Alex Link to comment Share on other sites More sharing options...
Bounty Hunter Posted September 22, 2006 Share Posted September 22, 2006 AFAIK SWB 18gal LWB 23gal Link to comment Share on other sites More sharing options...
hemi_comanche Posted September 22, 2006 Share Posted September 22, 2006 AFAIK SWB 18gal LWB 23gal That's not always true though, I have the long wheel base with a crappy stock 13 gal, and man it blows. Link to comment Share on other sites More sharing options...
Hot Rod Jeep Posted September 22, 2006 Share Posted September 22, 2006 I'm not sure either, but I got one that's I think an 18 gallon that someone can have. It's just a bare tank though. 8) Link to comment Share on other sites More sharing options...
Oizarod115 Posted September 22, 2006 Share Posted September 22, 2006 yeah, my SWB has a small tank, but if i run it far enough it fits over 13, i think its actually like 14 or somethign like that. :dunno: (if it really is 13 then i have better mileage than i thought !!) haha Link to comment Share on other sites More sharing options...
Wildman Posted September 22, 2006 Share Posted September 22, 2006 I could be that the PO just installed the sending unit incorrectly, bent the wire, tangled up on the elect wires??? :dunno: I just checked my Jeep parts manual and is shows- Sending unit (and Tanks) - EFI Eng. w/16 Gal Tank w/2.5L - 7Ft Box w/16 Gal Tank w/4.0L - 7ft Box w/18 and 23.5 Gal Tank w/2.5L - 6 and 7 Ft box w/18 and 23.5 Gal Tank w/4.0L - 6 and 7 Ft box The 16 Gal tank was used 1988 - 7ft box The 23.5 was an option for 7 Ft box, and the ones I seen have 3 straps on them. I know, it's confusing, But it's a Jeep :D Also there is 2 fuel pumps, one for the 2.5 and one for the 4.0, and no we won't even get to the '86. Link to comment Share on other sites More sharing options...
Oizarod115 Posted September 22, 2006 Share Posted September 22, 2006 i thougth SWB was 6ft and LWB was 8ft? I'm REALLY confused now. haha Link to comment Share on other sites More sharing options...
Pete M Posted September 22, 2006 Share Posted September 22, 2006 Nope, 6ft and 7ft. Link to comment Share on other sites More sharing options...
egghead Posted September 22, 2006 Author Share Posted September 22, 2006 Woah, thats a lot of replys. Thanks guys.. My tank has three straps on it, its a long box. I really wish I had a manual for my MJ. The previous owner must have thrown it out. :cry: Egg Link to comment Share on other sites More sharing options...
87manche Posted September 22, 2006 Share Posted September 22, 2006 aaron, take a measurement of your gas tank. I've got the larger tank and it measures a rough 32" in my LWB. I'm positive it's a 23 gallon tank, cause it just took 20 this morning to fill it from the low fuel light. It also mounts with the 3 straps. Link to comment Share on other sites More sharing options...
whowey Posted September 23, 2006 Share Posted September 23, 2006 Woah, thats a lot of replys. Thanks guys.. My tank has three straps on it, its a long box. I really wish I had a manual for my MJ. The previous owner must have thrown it out. :cry: Egg Send me a PM on the Mothership. I have an extra set I will sell cheaply to another MWC. Link to comment Share on other sites More sharing options...
4play Posted September 23, 2006 Share Posted September 23, 2006 The 3 strap tank is the 23 gal LWB tank. I hade to pull mine out - rust holes all in it :eek: . Replaced it with a 16 gal SWB tank. Biggest problem was the filler line was off. I probably could have set it further back, but the J bolt bent the rear mount while trying to get the old tank out and I was in too much of a hurry to try to fix that. By the time I got the filler working properly (without leaking), I probably could have easily just moved the tank back. :mad: Laziness does not always pay off. :dunce: Link to comment Share on other sites More sharing options...
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