Question about 1999 Pontiac Sunfire

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I have a 99 Pontiac sunfire the fuel gage floats between full and empty I know that it's not reading right. The sending unit in the take is good I tested it. So what could be causing this and how would I fix it.

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Also could be a bad gauge cluster did you recently alternator bad connects it or battery issues

Posted on Sep 14, 2015

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It's probably the float on the fuel pump.pull the pump and clean or just replace the fuel pump and float.

Posted on Nov 21, 2014

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Posted on Jan 02, 2017

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SOURCE: Fuel gage Not reading accurate fuel level

fuel gage makes wrong readings

Posted on Oct 03, 2008

  • 4 Answers

SOURCE: 2001 Pontiac Montana Temperature Gage and Fuel Gage malfunction

sending unit or float in gas tank, check if any broken wires or well plugged in and then check the float for the gas.

Posted on Dec 23, 2008

  • 11 Answers

SOURCE: 99 chevy silverado fuel gage malfunctions

A bad electric connector is possible. A bad tank sending unit can cause the same symptom. Usually the sending unit is a reostat mounted inside the tank.. it changes resistance depending on the float position, the resistance change causes a different voltage to the gauge or signal processor. The reostat may be a resistive plastic strip, as the float moves a contact pointer wipes the length of strip thus the change in resistance and voltage. Clear as mud?

Posted on Apr 07, 2009

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SOURCE: Fuel gage Not reading accurate fuel level

I just had my 99 sunfire diagnosed at a pontiac dealer for this same problem and they told me I had to replace the fuel pressure sensor...

Posted on Apr 28, 2009

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SOURCE: put in new float unit on fuel pump.gas gauge still not working

did you replaced just the float , because if the resistor that messures the level is not good you didn't do any thing you have to change the level sensor next to the pump..,Im sure that;s all the problem, you should also check the wiring next to the pumpand any connector down there

Posted on Aug 02, 2009

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I have a problems with my gage on my 1997 ford Thunderbird the gas go to full all the time what could that be


Here are some suggestions:

TROUBLESHOOTING
PROBLEM: The fuel gauge does not work at all...no needle movement. With the ignition switch on, remove the wire from the fuel tank sending unit and ground it to the unit housing. This removes the resistance supplied by the sending unit, and should cause the gauge to swing over to the 'Full' position. Does this happen?
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The gauge and wiring are good. The problem is most likely with the sending unit. The sending unit must be removed for further testing. (1) Ground the sending unit wiring to a good chassis ground (instead of the sending unit housing) and watch the gauge. Does it now peg out to the 'Full' side? Yes
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The problem is with the sending unit ground. Either the unit itself is bad or the float/arm is binding/missing. The sending unit must be removed for further testing. The power supply to the gauge has been interrupted, (check fuses), the gauge is defective, or the wire from the gauge to the sending unit is open or has a break in it. Testing the Sending Unit After the sending unit has been removed from the tank, check to make sure the float is present, intact and still floats and that there is no binding with the float arm. Reconnect the gauge wiring to the unit and ground the unit. Move the float arm up and down. If the gauge reads full in the full up position and empty in the full down position, then the sending unit is good. Verify by hooking up an ohmmeter to it and making sure it reads 8-12 ohms full and 70-73 ohms empty. If not, the sending unit needs repaired or replaced. You can easily disassemble the head of the sending unit to clean and/or repair.

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1 Answer

Bought a used 99 cavalier and the fuel gage goes from near empty to half and fluctuates as i drive is there a way to figure if it is the gage or the sending unit?


It is more likely to be at the fuel tank end of the system as the fuel level float is the consantly moving part and likely to become worn and give erratic readings. Replacing the sending unit should fix the problem. Also check for a loose connection in the wiring loom near the sending unit.

Dec 11, 2010 | 1999 Chevrolet Cavalier

2 Answers

My fuel gage keeps going from empty to full while im driving


The Fuel SENDING UNIT HAS FAILED And IS CAUSING This Fluxuation Of the GAGE, The Sending Unit Is Located IN the FUEL TANK & Requires TANK REMOVAL to Replace it,
NOTE;;;; IF YOU HAVE HAD THE FUEL PUMP REPLACED RECENTLY, THEN 99% PROBABILITY THAT THE INSTALLER WAS NOT VERY GENTEL WITH IT, THIS IS A COMMON REASON FOR THIS TYPE OF FAILURE.

Nov 28, 2010 | 2002 Chevrolet Venture Passanger

2 Answers

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.

Mar 16, 2010 | 2004 Pontiac Montana

1 Answer

Fuel tank level is giving a wrong reading


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Oct 03, 2009 | 1999 Pontiac Sunfire

1 Answer

How do you get to the gas tank to check and see if sticking


Yes there is a float that is connected to the sending unit in the gas tank. In order to get to it, you have to remove the tank (drain it first) and it all comes out the top of the tank. You will probably want to buy a whole sending unit to put in there. I'm not sure about yours, but the fuel pump and the sending unit may be all one piece. It's not a fun job, so you don't want to do it twice. I would change the fuel pump while i had it out anyway. Good luck!

May 21, 2009 | 2003 Kia Sorento

3 Answers

99 chevy silverado fuel gage malfunctions


A bad electric connector is possible. A bad tank sending unit can cause the same symptom. Usually the sending unit is a reostat mounted inside the tank.. it changes resistance depending on the float position, the resistance change causes a different voltage to the gauge or signal processor. The reostat may be a resistive plastic strip, as the float moves a contact pointer wipes the length of strip thus the change in resistance and voltage. Clear as mud?

Apr 06, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Gas gauge reads full all the time


hello, it sounds like it has something to do with your fuel sending unit located inside your gas tank,on the sending unit it has a float arm that reads the fuel level, some times that float arm gets jammed and wont show your actual fuel level,to fix this with your gas tank at least half full use a rubber mallet or any other object that wont damage the tank and with your key in the start position with the car not running but reading your gages hit the gas tank not to hard but hard enough to lodge the float arm loose, if this is unsuccessful then it will probably be a bad fuel sender location sensor located on the actual fuel sender if that's the case you'll need a new fuel sender. good luck and please send me a update or any questions let me know.

Mar 24, 2009 | 1997 Pontiac Bonneville

2 Answers

Fuel gage Not reading accurate fuel level


sounds like you got a malfunctioning float on your fuel pump (works like a toilet bowl) try adding magellans mystery oil (you can find it at most part houses like napa ect) to you fuel for a few tanks to see if it can loosen things up if not probably going to need to replace the part

Dec 04, 2008 | 1999 Pontiac Sunfire

3 Answers

2001 Pontiac Montana Temperature Gage and Fuel Gage malfunction


sending unit or float in gas tank, check if any broken wires or well plugged in and then check the float for the gas.

Nov 02, 2008 | 2001 Pontiac Montana

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