gas gauge or sending unit?

Dec 11, 2005 6 Replies

Hi all, about three day's ago I bought a 98 wrangler from a small dealer near my home. When I drove it off the lot it had well over a quarter tank of gas.(cheap a-holes) After driving about 5 min I looked down and was shocked to see it was dead up on "E"! I quickly ducked into the first(and as it turns out most expensive in town )gas station and filled up.The gauge is now working fine,but as I get closer to a quarter tank again I am curious to see what happens . could the cold weather have anything to do with this? and do you thin it more likely that the problem is in the gauge or the sending unit in the tank? thanks in advance.


MpW



Mine's not that bad, but certainly the bottom quarter of the tank is half the size of the other quarters :-)

Dave Milne, Scotland '91 Grand Wagoneer, '99 TJ

It is not so much that they are cheap. Many car dealers regularly keep a gallon or less in most of their cars, to discourage thievery. The manufacturers do it too. I once saw a car run out of gas, when the truck driver was unloading it from the carrier. You don't want the tank to get that low anyway. It will fill up with cold air and then condensation if you do. As W. C. Fields once stated, water isn't much good for anything, much less fuel. I really don't remember with my Wrangler, ever letting it get to

1/4 tank.

Earle

It's the sending unit and "they all do it" when we talk about the Wrangler TJ ('97 and newer). Don't rely on the accuracy of the gauge, it's just not accurate. And It will indicate WELL below the bottom red mark before it actually runs out of gas. Instead of the gauge, use the trip odometer to track the fuel where you'll figure out how many miles you'll get before you need to fill up. I use my gas gauge only as a rough indication. You may even think you've got a 15 gallon tank because it only takes around 14-15 gallons to fill up when the "Fuel" (low fuel) indicator lights up... bu there's usuall 3-4 more gallons in the tank than the gauge is indicating.

Jerry

Why Lee wrote:

Alwqays fill the tank, and count on refilling evey 200 miles. You'll get a good idea of the mileage you get, then you can extend the range to the max mileage X tank capacity. The guage is known to drop quickly when it gets below 1/4.

Dude, I was on a commuter train once that was stopped because the train in front of it hit a Mercedes that was on a test drive and ran out of gas on the tracks. The prospective buyer simply got out and stood back as the train approached. I'm sure the dealer mad sure that all of his inventory had enough gas to keep from dropping dead on the train tracks right outside the dealership's driveway.

Yet another reason not to have the clutch interlock switch - I'm sure he could have got it off the tracks using the starter motor.

Dave Milne, Scotland '91 Grand Wagoneer, '99 TJ

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