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Old 02-04-2014, 10:46 AM   #1
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12 gallon gas tank

So I drove until the E light came on then filled the tank. Only got in 12 gallons gauge read full. Topping it off burped gas back up. Is this an ICV problem?

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Old 02-04-2014, 10:49 AM   #2
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It is pretty common for this to happen, the gas gauges are notoriously inaccurate. Mine usually gives E light with 5 gallons remaining.

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Old 02-04-2014, 11:04 AM   #3
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I think fuel capacity for the Wrangler is 19 gallons and the light is supposed to come on with 2 gallons left. My TJ gets that close to empty to turn the light on and I fill it up usually with 14 gallons leaving 5 gallons in there already.

Wrangler gas gauges are notoriously inaccurate, just like Squid said!
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Old 02-04-2014, 11:05 AM   #4
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Originally Posted by Squid90 View Post
It is pretty common for this to happen, the gas gauges are notoriously inaccurate. Mine usually gives E light with 5 gallons remaining.
Interesting. I heard about this but couldn't tell if it was one thing or another. Any easy fixes? The "12" gallon tank isn't hurting me I would prefer accuracy though
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Old 02-04-2014, 11:08 AM   #5
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Originally Posted by Mr Mac View Post
I think fuel capacity for the Wrangler is 19 gallons and the light is supposed to come on with 2 gallons left. My TJ gets that close to empty to turn the light on and I fill it up usually with 14 gallons leaving 5 gallons in there already. Wrangler gas gauges are notoriously inaccurate, just like Squid said!
Cool thanks for the reply. As long as it holds the 19 I'll make it work. Have some fun in the snow!
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Old 02-04-2014, 11:28 AM   #6
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I believe some Wranglers only had a 15 gallon tank, so be careful.
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Old 02-04-2014, 12:15 PM   #7
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I believe some Wranglers only had a 15 gallon tank, so be careful.
Mines 2001 the 15 I think is in the 90s. Thanks for the warning though bud
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Old 02-04-2014, 12:24 PM   #8
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My 97 TJ is the same way. I always have about 4 gallons or so when I fill it up after the light comes on. Doesn't bother me in the slightest.
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Old 02-04-2014, 12:31 PM   #9
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I believe some Wranglers only had a 15 gallon tank, so be careful.
For a stretch of time (not sure what years) the 19 gallon tank was an option, but I don't believe they were ever standard. Based on my build sheet from Chrysler I have the larger tank in my '98. I can't remember off the top of my head how much it takes when the light is on, but I know I've pushed it a good many miles and have yet to run dry, knock on wood.

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Old 02-04-2014, 12:36 PM   #10
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Jeep never made a true 14 gallon tank. They used the 19 gallon tank and just attached a longer fill tube down into the tank. When the fuel level hits the bottom of the fill tube, the pump sees backpressure and shuts off. It can be "upgraded" to a 19 gallon tank by cutting ~3" off the tube.
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Old 02-04-2014, 01:59 PM   #11
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My 06 TJ unlimited build sheet lists a 19 gallon tank. When the fuel light comes on I usually put about 15 gallons in. At about 13 gallons I reset the hold open switch on the gas pump to its lowest (slow speed) setting otherwise it burps gas all over the quarter panel and the ground.
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Old 02-04-2014, 02:48 PM   #12
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I believe the 19 gallon tank became standard with the 1999 model year....
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Old 02-04-2014, 05:00 PM   #13
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The base model 2.5 SE were delivered with a 15 gallon (reduced size 19 gallon tank) tank. My 99 and 00 both the same. Based on info here I trimmed my vent tube about 3" to gain the extra capacity when I replaced the fuel pump assembly last year. Keep in mind that the sending unit for a 15 gallon tank is different than the 19. Fuel pump time is a good opportunity to upgrade but you have to order the pump for the 19 gallon tank.
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Old 02-04-2014, 08:25 PM   #14
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I believe the 19 gallon tank became standard with the 1999 model year....
The 19 gallon did became standard during the 99 model year
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Old 02-04-2014, 11:25 PM   #15
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It was a cheap way to rip off consumers by adding this "option" to get a bigger tank. Honestly it still pisses me off! I did the "upgrade" by cutting the vent hose on my "15 gallon" tank. I also replaced entire fuel sender and pump assembly with a 19 gal version. My Jeep goes empty usually at around 14.5 to 15.5 gallons - which means I likely have another 3-4 gallons left. Seems to be par for the course for most owners here.
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Old 02-05-2014, 04:41 AM   #16
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My '05 X is similar. Takes approx. 16 gallons to fill up if I wait until the light comes on.

Actually, I wish my Jeep had a larger tank. It would be nice to make it over 300 miles between fill ups.
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Old 02-05-2014, 07:41 AM   #17
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Actually, I wish my Jeep had a larger tank. It would be nice to make it over 300 miles between fill ups.
There's room to mount an auxiliary tank in front of the rear axle. It would have to be relatively flat, maybe only a few gallons. I haven't heard of it being done. Maybe I'll do it some day...

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Old 02-05-2014, 07:48 AM   #18
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Here is the 15 to 20 gallon Gas Tank Conversion -
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Old 02-05-2014, 01:41 PM   #19
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mine does teh same thing... hell i have had the needle not even move when i start the jeep and still only put 13 gallons in it.
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Old 02-05-2014, 02:42 PM   #20
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i actually did the convert ion on my YJ years ago the hardest part was to get the tube out of the tank, i never did put any back in the tank and it was fine. and made a 10gal in to a 20 gal.
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Old 02-05-2014, 03:01 PM   #21
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Originally Posted by wwch99tj View Post
The 19 gallon did became standard during the 99 model year
Not on mine
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Old 02-05-2014, 03:50 PM   #22
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yea mine was a 95 yj when i did it.
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Old 02-05-2014, 05:17 PM   #23
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Originally Posted by C.L. View Post
Jeep never made a true 14 gallon tank. They used the 19 gallon tank and just attached a longer fill tube down into the tank. When the fuel level hits the bottom of the fill tube, the pump sees backpressure and shuts off. It can be "upgraded" to a 19 gallon tank by cutting ~3" off the tube.
True that... I second this comment.
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Old 05-21-2014, 10:18 AM   #24
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Fuel Capacity

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Originally Posted by Mr Mac View Post
Here is the 15 to 20 gallon Gas Tank Conversion -
I have the issue on my 99 TJ It doesn't have the spring loaded license plate gas cover. Just the drivers side screw on cap. I can never get more than 11 gallons in after the light comes on and the needle says empty. This is frustrating and I seem to need to remove the 3 " off the vent tube.

Any instructions for TJ owners?
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Old 05-21-2014, 04:46 PM   #25
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Originally Posted by jtleitner View Post
I have the issue on my 99 TJ It doesn't have the spring loaded license plate gas cover. Just the drivers side screw on cap. I can never get more than 11 gallons in after the light comes on and the needle says empty. This is frustrating and I seem to need to remove the 3 " off the vent tube.

Any instructions for TJ owners?
Run tank down to empty and drop the it. Pull the fuel pump package out and stick your hand in towards the fuel neck and feel around for the vent tube stub that protrudes into the tank. I easily cut off about 3" with a sharp razor knife. Don't forget you will need to upgrade the sending unit to a 19 gallon for a proper read.
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Old 05-21-2014, 04:55 PM   #26
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Originally Posted by jtleitner View Post

I have the issue on my 99 TJ It doesn't have the spring loaded license plate gas cover. Just the drivers side screw on cap. I can never get more than 11 gallons in after the light comes on and the needle says empty. This is frustrating and I seem to need to remove the 3 " off the vent tube.

Any instructions for TJ owners?
Your 99 has a 19gal tank no need for this mod...IMO
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Old 05-21-2014, 05:54 PM   #27
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Originally Posted by JimsJeep View Post
Don't forget you will need to upgrade the sending unit to a 19 gallon for a proper read.
That way you can have a gauge that incorrectly displays the contents of a 19 gallon tank instead of a gauge that incorrectly displays the contents of a pretend 15 gallon one. ;-)
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Old 05-21-2014, 06:03 PM   #28
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Your 99 has a 19gal tank no need for this mod...IMO
Very possible he has the 15, they were still sold in 99' like mine was.
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Old 05-21-2014, 06:45 PM   #29
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My 95 I took the tube completely out of the tank and was going to cut it. But buddy of mine ASE mech. Said take it out and leave it out. We did all was fine shut off at 19.5 gal. Never looked back!

My 97 TJ I will work on shortly in that are so we shall see I'll post what I find. Was kind of nice to see it on full for more then a block after I filled up.
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Old 05-21-2014, 09:17 PM   #30
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Very possible he has the 15, they were still sold in 99' like mine was.
Mine was built in January 99 and has the 19 gallon tank...
http://en.m.wikipedia.org/wiki/Jeep_Wrangler
In 1999, the fuel tank became standard at 19 U.S. gallons (72*L; 16*imp*gal) capacity.

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