Question about 1999 Pontiac Firebird

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My gas gauge on my 1999 firebird does not work it says full but its not and the needle moves around once in a while what could be the problem?

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  • Pontiac Master
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It is most likely the sending unit in the tank.

Posted on Jul 11, 2010

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How do I repair or replace a defective gas gauge?


It is in the instrument cluster, which has to be removed to replace the gauge. It cannot be repaired. Did you first check the 10 amp METER fuse in the fuse panel?

Now let me say, that when the gauge quits, it is more often a fault in the sending unit in the gas tank, and not the gauge. Here is how to find out if your gauge is good: Find the fuel tank electrical connector, and pull it apart. You will need a small jumper wire. Find the blue wire in the body side of the connector (not the fuel tank side). Put the jumper wire into the blue wire terminal, turn the ignition key to on not start, and ground the jumper wire to a metal frame piece. Someone needs to watch the fuel gauge needle while the wire is grounded. If the gauge in the dash is good, the needle will move. It will probably go to either full or empty, but if the needle moves, the gauge is good and the fault is in the sending unit in the tank. Don't give up testing until you are sure the jumper wire is being grounded good to the frame. Just touch the wire to frame and watch the needle movement, once sure, stop so you don't blow the fuse. If the needle doesn't move, first check the 10 amp meter fuse. If fuse is good, it must be the gauge.

May 30, 2015 | 2000 Kia Sportage

1 Answer

1970 Ford F100 Gas Gauge Not Working


It may be the sending unit in the tank that needs replacing. Here's how you can check: Turn the key on and disconnect the sender unit at the gas tank. Ground the sender unit's wire with a jumper wire from the truck's harness to ground. Watch the gauge. If the gauge on the dash is good, grounding the sender wire will cause the gauge needle to react and should move to full. This would indicate a new sending unit is required. If the gauge doesn't move when the sender unit is grounded, the gauge is bad and needs replacing. Pull the instrument cluster out to replace the gas gauge. Likely any old ford gas gauge might work-back then, there were not so many production changes.

Nov 14, 2012 | Ford Cars & Trucks

1 Answer

Just bought a '92 plymouth Acclaim with 37000 miles. It's in great shape but I'm not sure if the fuel guage is working. Only drove it home, less than 10 miles. Is the guage mechanical or...


There's a float inside the tank that the fuel gauge works off of. If you step on the brakes or accelerate hard it causes the gas inside the tank to slosh around and you can see the fuel gauge move when you do this. If you know the vehicle has gas in it, the best way to check if the gauge is bad is to drive around enough to where you should have burnt a noticeable amount of gas. If the gauge doesn't move, then there's something wrong with it.


Since the gauge moved when you braked hard, I would assume it's working properly because it picked up on the level change inside the tank where the float's at.

May 19, 2011 | 1992 Plymouth Acclaim

1 Answer

Gas gauge stays on full


very common. The sender in the gas tank is the problem.
It will need to be replaced some day
Both my gas tanks do the same thing in my F250. 1 tank stays full all the time and the other drops from full to about a half tank when I get to half a tank and then works so so till empty.

Dec 22, 2009 | 1992 Pontiac Firebird

1 Answer

1999 buick when fuel gauge drops below 3/4 it is is not accurate


i dont know the specifics of a Regal, but usually, when a needle fluctuates too much, is because the float gauge in the gas tank is worn out, or its mount became loose. You cant see that effect on a full tank because the instrument needle and the float are pegged against the stop.

Nov 23, 2009 | 1999 Buick Regal

2 Answers

2001 chevy silverado 4.8 gas gauge not working properly


Fairly common problem with GM vehicles. The sending unit in your tank has a small circuit board that an arm is attached to which moves up and down according to your fuel level. This circuit board and arm are not making good contact. Unfortunately the only good solution is to replace this part.

Oct 28, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Gas needle moves


try supplying the radio with a new power line and earth, sounds like the radio power has been taken from the wrong place or there is a faulty earth commection.

Feb 11, 2009 | 1999 Dodge Intrepid

1 Answer

Gas gauge on 2004 pontiac montana sticks


Before you start your van, and the key's are on accesory. Does your needle move? If it does, your gage is good and you have a bad ground or wire harness. Worst you could have a bad  sending unit and that is in the gas tank it self. Start with checking all the wire connection. Good luck.

Dec 23, 2008 | 2003 Pontiac Montana

1 Answer

1999 gmc yukon gas gauge is slightly flickering


The sending unit in your tank is bad replace it.

Nov 19, 2008 | 1999 GMC Yukon

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