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About every car I have ever owned has had the same issue with the fuel guage. It seems that between full and three fourths the needle hardly moves, but at about two thirds the needle moves quickly. I would bet that with my tbird, between full and three fourths is probably more like 40% instead of 25%. Does anyone know what causes this?

RT
 

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It's normal. Almost all of my cars do that. I believe the float tops out before the tank is actually full, so it takes a lot more fuel to be burned for it to start moving again. I think it is so the gauge will be more accurate as it empties. You know it's ok when full, but you really want to know if you can make that last 5 miles to the gas station.

That's my theory anyway,
Rob
 

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It doesn't help that you have one sensor to measure the level of a fluid taht is sloshing around with that much surface area either.
 

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ShadowDragon said:
Also remember the shape of our gas tank.
Yep.

The gas gauge in my Formula is like that. The tank is V-shaped, so of course it's going to stay close to full for longer. 1/2 is more like 1/3rd, and if you're below 1/4th you're pushing your luck. I use the trip odometer along with the gauge, makes it a lot easier to know what you've got left.
 

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Mine seems to move slower as it gets lower. A half tank is more like 2/3 of a tank. My issue is how the fuel level seems to be at least 1/8 lower when I first start it than when I killed it last. It seems to be a recent development. There's no apparent leak though.
 

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kenshi said:
Mine seems to move slower as it gets lower. A half tank is more like 2/3 of a tank. My issue is how the fuel level seems to be at least 1/8 lower when I first start it than when I killed it last. It seems to be a recent development. There's no apparent leak though.
I've had that problem with my TBird for a long time. I'll park it and the next time I drive it she'll be nearly 1/8th of a tank lower, or even higher. But as soon as start driving, even just down the block, the level corrects itself.
 

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Good question.. Was wondering the same myself..

My gas gauge stays on Full 24/7.....

It hasn't moved in over 4 months.. wonder whats up?
 

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well mine is pretty accurate...when i put in my custom gauges i jus filled up the gas tank and topped it off then went back to my house which is less than a mile away and when i put the needle back on the gas gauge i simply placed it on *F*...so no problems with me :)

even if your gas gauge is off your low fuel light is never off ;)

and i go by the tripometer also...everyone should know how many miles they get on a full gas tank...
 

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Well, from my experience on ford cars, The guages are not always correct, that goes for other makes, but Ive seen it mostly on fords.

Like on my cougar, the fuel guage will pin all the way to full with a near empty tank when I fully tighten the gas cap. But when its loose, no problems.

On my sisters Escort, the same exact thing.

The supercoupe we really havent noticed a big problem with it yet, maybe cause its got a brand spanking new sending unit and tank. But Im really unsure of the cause of the other 2, but its ford related.
 

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The 'accuracy' of the fuel gauge on my car varies with which section/quadrant the needle's in:

The car'll go 180-200km (~112-125 miles) by the time the needle drops to ¾ full.
By the half mark, the total driven is about 300-330km (~186-205 miles).
At ¼ full, the total driven is 460-480km (~ 285-310 miles).
In the 'Check Gauges Zone,' it's safe to go another 50 miles...at least!

Usually, I'm filling the tank at 400 mile intervals (~644km), and putting in about 17.3 gallons of fuel...
 

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Well, mine always says it's full. I don't quite feel like emptying the gas tank to fix it, let alone taking off the gas tank to switch it out, so we'll go along with, it's broke, don't fix it. The guy I bought it from said that I might as well replace the fuel pump if I do that.
 

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The dealer replaced the fuel pump in my truck and since then the gas gauge hasn't gone past 1/4 tank. Since they fixed the pump "As a sign of good will" since it was "As-is" and the fuel pump went out within a week, they weren't going to go back in and fix the floater without me paying for it.
 
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