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My gas gage dont work someone said its the float and that i would have to replace the sending unit is that true and how

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Typically, your friend is correct, the sending unit fails the most often. You have to drop the tank to access the sending unit. If your car has fuel injection, be ready for a costly replacement, as the fuel pump is part of the sending unit.... Test the old sender with an ohm meter....

Posted on Mar 16, 2011


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One of two things: either the gage itself is malfuntioning or the float/sending unit in the gas tank is failing. Disconnect the plug at the tank for the sending unit, pick up a new sending unit and attach it to the plug without taking the old unit out of the tank. Then operate the float up and down on the new sending unit. If the gas gage reads correctly when the float is all the way up (full) and all the way down (empty) the old sending unit is probably bad and should be replaced. If there is no difference when you connect the new sending unit, the gage is probably bad. Then you can return the new sending unit (as long as the auto parts store allows returns of electrical parts) and buy a new gage. Install the new gage and...happy motoring.

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It could be a loose connection on the gauge or the fuel sending unit.
The fuel sending unit can get worn and have breaks in the contact area that is used to determine float position to send the fuel level reading to the gauge.
I suspect that you have problem with the fuel sending unit considering that the light is on. I am assuming that the light that is on is the "low fuel light". Check your connections at the sending unit if the connections are secure then I would suggest replacing the fuel sending unit.

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1 Answer

Gas gage does not work

you probly have a bad sending unit wich is conected to the pump in the tank so you will have to drop the tank to fix it also check the fuses to when you drop the tank the unit will have a float on it the pump will be two or three
piece you can replace the sending unit any auto parts store will have the part and directions with the new part

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98 oldmobile cutlass fuel gage will go to full when filled but as soon as it uses 1/4 of a tank it (the gage) drops and i dont know how much gas is in there

there is a fault with the sending unit in the fuel tank, if the gauge can move to full when you fill the tank it is good.
only way i know how to test the sending unit is to take it out of the fuel tank and hook a meter to the float wires, move the float manually and the meter will go to zero if the unit is bad

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1 Answer

My ga gage dont work i was told thats the float but i need to replace the sending unit is that true and how its a 1987 dodge dakota

I presume you are referring to your 'Gas Gauge'.
The gauge could be defective, however it's most likely the sending unit, which is a float connected to a varible resistor or rheostat.

I cannot improve on these links:

You could of couse purchase locally but for reference partstrain offers two different sending units for less than $30.

Good luck

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1 Answer

Gas gauge doesn't work

The no. 1 cause of the gas gage not reading or reading incorrectly is that the sending unit for the gas gage inside the gas tank is defective, this is esp true on older cars and trucks, In order to replace the gas gage sending unit requires the gas tank be removed.

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NO, on the fuel pump assembly is a swinging type arm with a float on the bottom end and some metal teeth on the other, as the fuel leval goes up or down these teeth contact a plate on the body of the fuel pump assemby that send a signal to the gauge. Now either your float arm is sticking, guage is bad, or the sending unit is bad. I would suggest the sending unit, it is availble as a repair unit, you dont have to buy the whole fuel pump. The gauges usually last the life of the car.

Feb 10, 2010 | 2000 Chevrolet Venture

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My jeep when empty still has 6 gallons approx left with the light on, i assume the sending unit took a ****, or the float is messed up. As the 2 people above i would say the method to fix your problems is having the sending unit replaced. Which means taking the fuel tank down and replacing the sending unit which housed the fuel pump and the float/line. Not cheap.

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