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Old 03-26-2012, 12:51 PM   #1
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Gauge or pump?

Still pretty new to the Jeep thing,

97 SE 2.5, 105,000 miles.

Fuel gauge shows 3/4 when full, fuel warning light comes on when there's still 4-5 gallons in the 15 gallon tank.

Would that be the fuel pump/sender or the gauge. (The fuel pump is internal with sender attached, right?)

If it's the gauge, can I replace ONLY the gauge?

Thanks

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Old 03-26-2012, 12:58 PM   #2
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It could also be the position of the float arm in the tank as well. If it was bent at some point it would not read accuratly. Think of it like the float arm in your toilet. If its set to high, the water will reach the over flow and never shut off. If its to low, you don't get a powerfull flush. Or relating to the jeep, either you run out of gas at 1/4 of a tank, or your sitting on E with 1/4 tank left.

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Old 03-26-2012, 12:58 PM   #3
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Known issue in the TJ's. Best thing to do is not worry about. Just reset your trip odometer everytime you get gas. That way you'll know how many miles you have traveled since fill up. Just start to think about refilling when you get around 200-250 miles, according to what your particular set up is. My light always comes on around 180-200 miles even though I still have 4+ gallons in it.....not a big deal to worry about that gauge to me.
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Old 03-26-2012, 02:03 PM   #4
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Not trying to open a new can of worms but...all TJs have the same (19gal) tank. The so-called 15 gal. ones have a longer vent tube that prevents the last 4 gal. from entering the tank. There are write ups on how to cut the tube & gain the extra capacity (don't cut the wrong tube). But to the point, there are 2 different sending units. One for 15 & one for 19. The 15 reads full when about 3/4 full in a 19 tank. I would guess you have a 19 gal sending unit in your tank. When you fill it to 15 gal (full to you) the sender only goes up 3/4 of the way. Don't know how or if that affects the warning light, they all seem to vary a lot. I found a photo of a sender somewhere & you can see the label says TJ15 which I think is from a 15 gal tank. Some that cut the vent then switch to the 19 sender, others live with the fact that they use 1/4 tank before the gauge begins to drop.
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Old 03-27-2012, 06:18 AM   #5
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It's a 15 gallon sender, when the warning light comes on, it will take 9-10 gallons to "fill up".

I've read about cutting the vent tube here on the forum. Probably will do that if I don't have to replace the sender, or just use the 19 gallon pump if I do have to replace it.

I've done a couple of searches and it appears to be a fairly common problem, I just can't find any threads about how anyone fixed it, other than:

1. Just guess how much is in the tank and hope for the best. (Which is what I've been doing)
2. Carry extra gas.
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Old 03-27-2012, 06:24 AM   #6
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Quote:
Originally Posted by Ichabod
It's a 15 gallon sender, when the warning light comes on, it will take 9-10 gallons to "fill up".
Uh, when my light comes on in my 98 TJ, it ALWAYS takes at least 11 gallons to fill up, sometimes 12+.
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Old 03-27-2012, 07:31 AM   #7
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Quote:
Originally Posted by kshaws21 View Post
Uh, when my light comes on in my 98 TJ, it ALWAYS takes at least 11 gallons to fill up, sometimes 12+.
Yeah, that's kinda the problem. I have a 2.5. If you have the same tank then:

Your light comes on with app. 2-3 gallons left in the tank.(less than a 1/4 tank 30-45 miles to empty @ roughly 15mpg)

Mine shows empty and the light comes on with 4-6 gallons (1/4 to 1/2) or 60-90 miles left @15mpg.

And mine shows 1/2 to 3/4 when it's full.

So, I'm guessing mine should be working more like yours.

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