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Unread 07-28-2015, 02:12 PM   #1
72andsunny
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You never know until you run out.

I drove my 99 TJ way below the E this morning, but was only able to fit 16 gallons in it. The gauge went well above the F, but as usual, it dropped below the F after about 20 miles.

Question for the group: Did I likely have another 3 gallons in reserve, or have I been unable to completely fill the tank?

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Unread 07-28-2015, 02:40 PM   #2
Jeepsr4me
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What does your build sheet say you have for a tank?

if 19 then yes you had more in there.. If 15,...... well you was about sucked dry

get build sheet here
http://jeep.custhelp.com/app/jeep/e...WGxOMmc2T2w%3D
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Unread 07-28-2015, 03:25 PM   #3
jjvw
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You had 3 more gallons.
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Unread 07-28-2015, 04:30 PM   #4
72andsunny
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I've got a 19 gallon tank. (Though the 16 gallons today is the most I've been able to fit in it.) It is painful to fill up. I was planning on buying an electric car, and the Jeep was supposed to be my beach car, but I'm not making enough money this year to claim the electric tax credit, so the Jeep is my daily driver until at least January.
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Unread 07-28-2015, 05:20 PM   #5
emcee5000
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The early TJ's 97 to 99 (maybe more) were built with the same gas tank, although 19 gallon was an "option". I cut the vent tube inside the tank and turned my 15 gallon into a 19 gallon. That trick was all the rage back in the early 2000's
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Unread 07-28-2015, 10:45 PM   #6
Knuckelhead
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Quote:
Originally Posted by 72andsunny View Post
I drove my 99 TJ way below the E this morning, but was only able to fit 16 gallons in it. The gauge went well above the F, but as usual, it dropped below the F after about 20 miles.

Question for the group: Did I likely have another 3 gallons in reserve, or have I been unable to completely fill the tank?
Did the fuel light come on?
When my fuel light comes on I have 2 gallons left in the gas tank. Almost all TJ's have different results.
Quote:
Originally Posted by emcee5000 View Post
The early TJ's 97 to 99 (maybe more) were built with the same gas tank, although 19 gallon was an "option". I cut the vent tube inside the tank and turned my 15 gallon into a 19 gallon. That trick was all the rage back in the early 2000's
The 15 gallon tank was only an option on the 2.5L equipped TJ... IIRC
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Unread 07-29-2015, 06:12 AM   #7
GringoLoco
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I've never run out of gas, and I've really pushed it out of curiosity on nice days when I had time to kill and wouldn't mind a little walk. If I fill it when the light comes on it takes about 15 to 16 gallons. The most I've put in there was 18 gallons. Usually when my gas light comes on I know I can wait until the way home from work the next day if I'm lazy (13 miles each way). My light seems to be more conservative than others, but it's never let me down.
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Unread 07-29-2015, 07:23 AM   #8
Denzien
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Maybe the OP has a 19ga tank with a 15ga sensor? Is that possible?
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Unread 07-29-2015, 07:50 AM   #9
UTWeezul
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I've run mine a lot with the light on and the most I've ever put in has been 16.5 gallons. But my light comes on really early. The TJ gas gauge is very inaccurate.
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Unread 07-29-2015, 07:58 AM   #10
Jeepsr4me
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Just so ya know, the fuel pump is cooled by FUEL.... so when you running low the pump is not being cooled as well.
Why they say always keep it 1/2 full if you can.
Shortens the life of the pump... By how much I dont know.. Mythbusters would have to figure it out.
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Unread 07-29-2015, 09:13 AM   #11
biffgnar
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Quote:
Originally Posted by Jeepsr4me View Post
Just so ya know, the fuel pump is cooled by FUEL.... so when you running low the pump is not being cooled as well.
Why they say always keep it 1/2 full if you can.
Shortens the life of the pump... By how much I dont know.. Mythbusters would have to figure it out.
The pump is cooled primarily by the fuel going through the pump more than the fuel outside the pump. There will be fuel going through the pump until it is empty and the pump will stop. This concern gets over exaggerated.
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Unread 07-29-2015, 09:27 AM   #12
Jeepsr4me
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the exchange of heat happens both ways... A fluid transfer is greater than air transfer.
So when exposed to the air in tank the pump will be hotter than if it was under a fluid.
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Unread 07-29-2015, 06:52 PM   #13
Knuckelhead
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Quote:
Originally Posted by Jeepsr4me View Post
Just so ya know, the fuel pump is cooled by FUEL.... so when you running low the pump is not being cooled as well.
Why they say always keep it 1/2 full if you can.
Shortens the life of the pump... By how much I dont know.. Mythbusters would have to figure it out.
Who is they? and can you show any reference to this in the OEM owners manual or FSM?...
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Unread 07-30-2015, 07:29 AM   #14
Jeepsr4me
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Quote:
Originally Posted by Knuckelhead View Post
Who is they? and can you show any reference to this in the OEM owners manual or FSM?...
do a search on the net... There is a lot of THEY...

I am not qualified to say why or why not, I just say it seems logical and go with it.
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Unread 07-30-2015, 12:11 PM   #15
Jeepsr4me
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consumer reports was one THEY..

http://www.consumerreports.org/cro/n...stly/index.htm
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