Question about 2000 Pontiac Firebird

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Installed new fuel pump assymbly. car starts fine and runs, as soon as starts, fuel gauge goes to full, with in 30 seconds falls below empty 2000 ponitiac firebird 6cyl 3.8

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  • rjc008 May 14, 2009

    is fix means, whole another assymble needs bought?

  • rjc008 May 14, 2009

    thank you very much for that help. i'll be doing this monday. hoping it might just be float.

  • Dave  C
    Dave C May 11, 2010

    Hopefully not! Take it out and have a look at it, is it sticking or bent, damaged in anyway? When you have it out, ground it to the car and try it up and down to make sure it works before you put it in the tank and the do it very carefully.

  • Dave  C
    Dave C May 11, 2010

    The sender unit was damaged or hung up when you installed the pump. It will have to come out again to fix it...not fun.

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  • Pontiac Master
  • 3,433 Answers

Wire connection on pump is poor or incorrect.

Posted on Aug 27, 2009

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Fuel gauge not working all the time.


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After a fuel fill up, the time for the fuel gauge to move from empty (E) to full (F) ranges from 2 seconds to 55 minutes depending on which operating mode the fuel gauge is in.
The default fuel gauge mode is called the anti-slosh mode. To prevent fuel gauge changes from fuel slosh (gauge instability due to changes in fuel sender readings caused by fuel moving around in the tank), the fuel gauge takes approximately 55 minutes to go from empty (E) to full (F).
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At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
The instrument cluster must receive a valid key ON fuel sender reading within 1 second of the key being put into the RUN position. The key ON sample readings are considered valid if the fuel sender reading is between 15 ohms ± 2 ohms and 160 ohms ± 4 ohms.
If these conditions are not met, the fuel gauge stays in the anti-slosh mode, which results in a slow to read full (F) event.
The key ON fueling mode (approximately 90 seconds to read empty [E] to full [F]) requires 3 conditions be met:
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The instrument cluster is in the anti-slosh (default) mode.
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