Question about 1999 Buick Park Avenue

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Gas gauge on park ave 1999 does not give accurate reading. Jumps around. Can it be done without dropping tank.

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Buick dealers have a diagnostic box that checks gauge sweep and range, an 0-100 Ohm variable potentiometer with key on can check this gauge however you must tap into the wire going for the sending unit at the tank. With a voltage meter check the four wire connection (only one)connector going to the top of the tank, find a good ground and check for voltage one will be 12 volts with KEY ON ENGINE OFF look for a 12 volt reading for 5 seconds and then it will stop this is for priming fuel rail and is to fuel pump, you want the ground side of the gauge the other two will be grounds, fuel pump and gauge. The grounds may be near the wiring harness going to the frame. In either case they will be grounds you are looking for the one that is not either ground or power, most likely it will be either a flashing light or very low voltage. Attach the pot to the gauge wire and have someone watch the fuel gauge if it is erratic the gauge is the problem. If the gauge sweeps slow and steady the problem is in the sending until in the tank. AND HAS TO BE DROPPED! Run the tank down on fuel as low as you dare and drop tank. Be carefull working with fuel can be very DANGEROUS if you are not experienced working around fuel DON'T Attempt!

Posted on Oct 13, 2010

  • tharris396 Sep 17, 2013

    Yes, the fuel pump can be accessed by removing the access panel that is located in the trunk directly behind the back seat. It is beneath the carpet. Once you remove the access panel you will see the top of the fuel pump/sending unit assembly. Disconnect the twwo fuel lines, two wire connectors and remove the retainer ring. It is very easy. Just be careful when you pull out the sending unit because the float will catch at the top of the gas tank.

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