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Old 06-07-2011, 02:50 PM   #1
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fuel gauge lies, 299.4miles out of a tank

So we here are always discussing how many gallons are tanks are, how crappy are fuel gauges are ect.....

well i finally decided I would drive till I ran out of gas (I know i know, its bad for the pump)

I filled up earlier about a week ago till it clicked, then got a few extra bits of gas in after.

drove 85% topless and doorless
5% topless with doors
5% top with no doors or windows
5% soft top on with doors and windows

At 230 miles the fuel light came on. The manual says when the light comes on there are 2 gallons left, I said NO! (never been able to fit more then 15 gallons in the tank)

once we hit 250/260 miles the fuel gauge needle was all the way down and stopped moving.

continued all the way to 299.4 and it simply stalled and i pulled over. I put 2 gallons in the tank (had a can with me), drove 12 miles then forced (almost over flowed) 18.5 gallons in the tank.

my calculations brought up a low 15MPGs.

so If you fill your tank pass the first click and average 15+ MPGs then you can get 300 miles from your tank if you have the 19 gallon tank. The gauge lies and says empty before you truly are.

fun little experiment (my pump is brand new and under warranty, wont be doing this ever again either)

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Old 06-07-2011, 03:02 PM   #2
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What's the point here. All fuel gauges are an estimate, and not accurate. It's been that way for the 44+ years I have been driving vehicles. The only fuel gauges that better be accurate are on airplanes.

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Old 06-07-2011, 03:04 PM   #3
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My manual says when light comes on 2 gallons left. Just as you said I went about 35 miles one time and didn't run out after light comes on
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Old 06-07-2011, 03:15 PM   #4
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this is funny i was contemplating this exact same experiment today, this most recent tank my gauge shows im half empty at only 100 miles!!! I checked my tire pressure, air filter, made sure brakes weren't rubbing i was flabbergasted it could be off by so much. normally the gauge would read half way at about 200 miles than the 2nd half the needle would drop drastically, light would come on around 240 miles...I have gotten 320 miles out of a tank once, i have the 4.0 and have 31x10.50s putting a gas tank in the back and driving till shes dry to see if it really just is the gauge and hopefully not something else
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Old 06-07-2011, 03:22 PM   #5
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Quote:
Originally Posted by Atthehop View Post
What's the point here. All fuel gauges are an estimate, and not accurate. It's been that way for the 44+ years I have been driving vehicles. The only fuel gauges that better be accurate are on airplanes.
I'd still rather it be accurate then not. But my gauge is always changing, sometimes I will go till it clicks and it will only show 3/4, then sometimes full. Nature of the beast I suppose. I just usually hit up a station when the light comes on, but I'd love to have an accurate needle if I could.
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Old 06-07-2011, 03:23 PM   #6
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Quote:
Originally Posted by Atthehop View Post
What's the point here. All fuel gauges are an estimate, and not accurate. It's been that way for the 44+ years I have been driving vehicles. The only fuel gauges that better be accurate are on airplanes.
The point is, I have seen plenty of other wondering the same as I so i put up my results
I guess theres no point
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Old 06-07-2011, 04:18 PM   #7
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Do you have the proper speedo gear for those 31's? If not, you may well have driven more than 299.4 miles. I think it's smart to figure out how much more fuel you have after the light comes on. That way you pretty no how much further you can go if you're in a situation to where you have to keep on moving. Thanks for the info!

-Wes
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Old 06-07-2011, 04:41 PM   #8
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good info.

I despise the gas gauge in my Jeep for two reasons:
1. it lies
2. it goes to empty too fast
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Old 06-07-2011, 05:11 PM   #9
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I get the same results
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Old 06-07-2011, 05:38 PM   #10
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its that way for safety im sure so more people dont actually run out of gas because we all know how "good" and how well they pay attention the majority of drivers are
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Old 06-07-2011, 06:02 PM   #11
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Quote:
Originally Posted by Atthehop View Post
What's the point here. All fuel gauges are an estimate, and not accurate. It's been that way for the 44+ years I have been driving vehicles. The only fuel gauges that better be accurate are on airplanes.
hahah funny you say that, had an aircraft come last night and the right tank was reading ---- for fuel replace one the first sending unit in the tank put some fuel in (have to drain the wing tank to get to the sending unit obviously) , and 3900 lbs of fuel reading lol
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Old 06-07-2011, 06:14 PM   #12
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I thought the light came on when 4-5 gallons were left. I've read that on this forum before. It said that because it was trail rated it woul let u know when u were getting close. Please correct me if I'm wrong
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Old 06-07-2011, 10:15 PM   #13
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my speedo has been corrected for the 31s
TJ-Simons, the light does turn on with 4-5 gallons left. im not sure if that was jeep's plan or not but that appears to be when the light turns on, in my case at least.
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Old 06-07-2011, 10:24 PM   #14
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Gas gauges err on the side of caution. I (until this summer) consistently got 270-280 miles to the tank with needle never moving when started. I know that,when I am that far into the E, I have ~1.5 gallons left. My low fuel light usually comes on around 250+ miles into a tank. But it sure does love to go from F to 1/2 really quick though!
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Old 06-08-2011, 09:24 PM   #15
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Mine always hits 1/2 tank quick. Went on a trip last month and made it only 150 miles from completely full to half tank. But I managed 315 miles on that tank, filled up and took almost 18 gallons.
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Old 06-08-2011, 10:02 PM   #16
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Quote:
Originally Posted by fkuszaj
this is funny i was contemplating this exact same experiment today, this most recent tank my gauge shows im half empty at only 100 miles!!! I checked my tire pressure, air filter, made sure brakes weren't rubbing i was flabbergasted it could be off by so much. normally the gauge would read half way at about 200 miles than the 2nd half the needle would drop drastically, light would come on around 240 miles...I have gotten 320 miles out of a tank once, i have the 4.0 and have 31x10.50s putting a gas tank in the back and driving till shes dry to see if it really just is the gauge and hopefully not something else
I'm fighting to see 100 at the half way point. I know the gauge is off but i can't ever seem to get there. It seems to drop fast the first half and then slow down.

15-16 is the best I've been able to get overall
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Old 06-08-2011, 10:19 PM   #17
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On average my fuel light turns on @ 250 miles with about 4 gallons left. I usually run a few days with it on before filling up.

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