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Posted on Apr 05, 2010
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When you start up car gas hand shoot to full and then drop to emty

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  • Master 564 Answers
  • Posted on Apr 05, 2010
Anonymous
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Joined: Jan 31, 2010
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Could be two things,,float in gas tank,,bad fuel gauge, in instarmint ctuster

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1answer

My f350 just shut off while driving then wouldnt start i used butain to start it the it ran aslong as i had my foot on the gas pedel

Check fuses first, then I would check the wiring harness for any issues.I would say fuel issue definitely. Sometimes the pump and gauge are one unit, sometimes separate, but they share the same wiring harness.
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Gas gauge goes full emty full emty gaugegenerly reads full but latly its up and down truck runs then wont

You need to test the gauge and the sending unit in the gas tank itself. In most cases I find this is the sending unit in the tank. Unfortunately, that is usually combined with the fuel pump in 1995 and newer vehicles which means you have to replace the whole unit. If you have 2 opening to your tank with wires coming from both you have a separate level sending unit from the fuel pump. If there is only one they are combined. Check for shorts on those wires.
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2000 s-10 4 cyl. truck runs good gas gadge gose from full to emty with a full tank or emty tank dose not matter? whats the fix!

had the same problem on my 2000 s-10 ,turned out the wire from sending unit had worked loose(bad crimp). The fuel pump had recently been replaced. the connector to the sending unit was different from original . the new pump included the different connector ,but it had to be spliced in .Check connections at tank/fuel pump.Also there were 3 ground connections 1 tank to frame 2 bed to frame on my s-10 hope this helps
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Gas gage read full when empty and sometimes emty

You have a bad fuel level sensor.The fuel tank needs to come out and the sensor replaced.You don`t have to replace the pump assembly.You can get the level sensor separate.I`m not sure if the parts stores have it but I know the dealerships do.Hope this helps.Good luck.
2helpful
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My fuel gauge reads full then suddenly drop to emty when i start the engine this is a 2001 buick century

I had a Malibu do that. The problem was the float (or whatever its called these days) in the tank.
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Tank is full but guage says emty

THIS PROBLEM IS CAUSED BY A DEFECTIVE GAS GUAGE SENDING UNIT, U WILL NEED TO PULL THE FUEL TANK AND REPLACE IT.
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Won't take gas

did you try a different gas pump or station?
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