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Old 06-17-2010, 08:15 PM   #1
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curious

so my gas light goes on and when i fill it up i can put in around 13 gallons at the most.
so i figured i had a 15 gallon fuel tank.
BUT i contacted jeep for my build sheet and it says i have a 19 gallon fuel tank
is it really possible that i have 6 gallons left after the light goes on? is that normal?

98 tj 4.0 5 speed

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Old 06-17-2010, 08:18 PM   #2
Knows a couple things...

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is it really possible that i have 6 gallons left after the light goes on? is that normal?
Absolutely, the TJ's fuel gauge is notoriously inaccurate. My '97 would turn the low fuel light on with about 5 gallons left. My '04 will turn it on with about 10 gallons (no exaggeration) left.

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Old 06-17-2010, 08:19 PM   #3
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When the light first goes on it's very possible that there is still 6 gallons left in your 19 gallon tank. I have run mine below E and had about 3 gallons left.
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Old 06-17-2010, 08:28 PM   #4
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Cool, i guess il just drive around with a spare gas can till she starts sputtering haha
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Old 06-17-2010, 08:48 PM   #5
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i can make it 20 miles on the highway when the light goes on, feel bad for my brother his STI only goes around 8 miles after the light goes on
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Old 06-17-2010, 09:10 PM   #6
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I have a '98 TJ....gauge appears to be accurate but occasionally when I first crank it up, gas gauge doesn't come off of empty even though there is plenty of gas in tank. Shutting engine off and cranking back up a time or two will get the gauge up to actual level. What's with that?
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Old 06-17-2010, 10:23 PM   #7
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I agree with Jerry, my 00 was dead on, but my 05 Rubi has around 4.5 to 5 gal left when the light comes on. I carry a 5 gal can on my tire carrier anyways so its not an issue. Thought about removing the sender and "tweaking the float" to read more accurately. When I tackle my stretch I will be adjusting it some.
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Old 06-17-2010, 10:25 PM   #8
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Cool, i guess il just drive around with a spare gas can till she starts sputtering haha
Not a great idea to run it out of gas
If you can help it
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Old 06-18-2010, 07:18 AM   #9
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I have a '98 TJ....gauge appears to be accurate but occasionally when I first crank it up, gas gauge doesn't come off of empty even though there is plenty of gas in tank. Shutting engine off and cranking back up a time or two will get the gauge up to actual level. What's with that?
Mine does the same thing, the check engine light also comes on with a code saying that there is an over-voltage to the fuel sending unit. Once I burn about a gallon of fuel and restart it, the gauge will go back to normal.
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Old 06-18-2010, 07:22 AM   #10
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I was told years ago that newer in tank fuel pumps used the fuel for coolant. Is it possible that they do this to keep fuel around the pump? My wifes car does the same thing. At dead "E" she still has 4-5 gallons in the tank.
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Old 06-18-2010, 07:48 AM   #11
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I have a 19 gallon tank and my light comes on at 16-17 gallons of use. Then it goes past the empty, and looks like it's gonna break off. Then I'll fill up and have two or three gallons left.
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Old 06-18-2010, 08:20 AM   #12
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I think we all have the same issue. Trying to find where true empty is on our gas gauge.

But I have always been more curious about the right hand side of my gas gauge.
When I fill in up. My needle is past the F. If I only have a 19 gallon tank where is the extra fuel?
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Old 06-18-2010, 08:33 AM   #13
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I have found it best to learn the way your particular jeep operates and go from there. Like most others, my light comes on even though I have about 2 or 3 gallons left. I never like to run my tank dry on anything and it is possible the fuel is cooling the electric fuel pump as well. If I am in a bind somewhere, I know I have a few gallons left to get me to a gas station, but usually I always go and fill up as soon as the light comes on. My Harley does this same thing, light comes on but still 1 gallon left in the tank. It has the electric fuel pump as well.
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Old 06-18-2010, 09:07 AM   #14
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I don't use the gauge.. I reset the trip meter every fill up and do the math in my head. Luckily I drive exactly one tank a week and fill up at the same station every time on the interstate the same day of the week at the same time.
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Old 06-18-2010, 09:17 AM   #15
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I ....think my manual states when the light comes on that I have about 2 gallons left. that doesn't mean anything, I could have 1 gallon or 4 gallons. I try not to push it, I might drive a little but I'll try and get gas ASAP. I don't know if it's true or not, someone here could probably agree or disagree with a good reason, but I've heard you do not want to let older vehicles run out of gas because over the years, trash and stuff tends to settle in the tank at the bottom. so when you run out of gas, you start sucking that stuff out, thus running a risk of damaging something.


Again, I have no idea if that's true, It kinda sounds logical but the more I think about it, it really doesn't. I have no idea where the gas is pumped from inside the tank and I figure if there is anything in there, then it would get sloshed around with normal driving and cause some if any damage that way.

I've heard also it's bad to let fuel injector system run out of gas. I don't know the reasoning behind that.

Either way, I simply don't let mine go down too low because I don't want to be left on the side of the road.
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Old 06-18-2010, 09:45 AM   #16
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any one else see a problem with gas cooling a fuel pump. that's going to help me sleep at night.

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