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Fuel gauge is not working,always stays in full position

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It sounds like a bad sending unit. That is the piece that tells the Gage what the level of fuel is. Its aggravating to change because its in the tank and attached to the fuel pump. Good luck.

Posted on Jun 04, 2009

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1 Answer

Fuel gauge stays on full


Sounds like you have a bad sending unit in your gas tank. You will need to take it to a mechanic to get checked. This isn't really a do it yourself type repair since it involves removing the gas tank.

Dec 14, 2015 | 2001 Hyundai Elantra

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Why does fuel gauge stay above full?


In the mean time you may want to adopt the system I have done with my MY98. I reset the trip odometer at each fill-up. I have always had plenty of reserve in the tank when I refill at 300 miles driven. It is annoying but after 7 years I have learned to live with it. My tank contains 23 gallons and I usually have 6 or more gallons remaining at fill-up.

The expense of dropping the tank and having the repair vs the always check before travel the trip odometer has worked out for me. I have learned this process from boating where the fuel gauges can never be trusted.

Dec 01, 2015 | 2004 GMC Envoy

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Fuel gauge not working


Try filling half full then reverse pretty fast then slam on the brakes or drive forwards and slam in breaks may push the plunger to correct position if not then have the mechanic pull back out and fix the gauge arm"looks like a bent coat hanger with a plastic piece on the end"

Feb 16, 2014 | 1994 Cadillac Fleetwood

1 Answer

I have a 1992 Mercury Grand Marquis Ls with a fuel gauge that does not work (gauge may be reversed)??? help please.


The fuel level indicating system is a magnetic type system, which consists of the sending unit located in the fuel tank, an anti-slosh module located on the back of the instrument cluster, and a fuel gauge located in the instrument cluster. The sending unit changes resistance according to the level of fuel in the fuel tank, which varies the current flow through the gauge.The pointer position varies proportionately to the current flow. In this system, the sending unit resistance is low (22 ohms) when the fuel level is low and high( 145 ohms) when the fuel level is high. The pointer of the magnetic gauge remains in position when the ignition is turned to the Off position. On some models, an anti-slosh module is used to dampen out fluctuating fuel signals from the sender. Some vehicles are equipped with a low fuel warning indicator. The anti-slosh module will also actuate the low fuel indicator when the fuel level in the tank reaches 1/16 to 1/8 full.


Do your other gauges/warning indicators work properly with the ignition on? If not, check for power at the fuse panel/fuses.

If they do then partially remove your cluster with connector still installed and check for voltage at cluster connector and gauge. Check continuity of cluster and gauge for ground.

Sometimes the anti-slosh module (if installed) goes bad in the Grand Marquis but not likely.

Sender troubleshooting:
  1. Perform test with resistors as follows:
    1. Disconnect wiring connector at sender unit, then connect resistor between gauge lead and a suitable ground.
    2. Turn ignition switch to On position.
    3. With 145 ohm resistor, the gauge pointer should contact the Full mark.
    4. With 22 ohm resistor, the gauge pointer should contact the Empty mark.
  1. Perform test with fuel sender of known quality as follows:
    1. Turn ignition to Off position.
    2. Disconnect wiring connector from sender and connect it to test sender.
    3. Move float rod away from fuel filter against Full stop position. Wait approximately 30 seconds, then turn ignition switch to On position. The gauge should read on or above the Full mark.
    4. Move float rod toward fuel filter against Empty stop position. Turn ignition switch to Off position. Wait approximately 30 seconds, then turn ignition switch to On position. The gauge should read on or below the Empty mark. If gauge works properly replace sender, which involves dropping fuel tank.

Mar 23, 2013 | 1992 Mercury Grand Marquis

1 Answer

1998 chevrolet astro van/fuel gauge always stays on full


Usually a sign of a faulty sending unit in the tank.
A mechanic would ground the wire to the sender to see if the gauge moves.

Jul 09, 2012 | Chevrolet Astro Cars & Trucks

2 Answers

Gas gauge goes past full when you turn on


Could be a short to ground on the positive wire leading from the fuel sender.

Apr 01, 2010 | 2004 Jeep Grand Cherokee

1 Answer

1995 Honda Civic fuel gauge stuck onfull.


the fuel level sensor in the gas tank needs to be replaced easy way is a new fuel pump assembly

Oct 19, 2009 | 1995 Honda Civic

3 Answers

Fuel gauge stays on full


Change the sending unit it is not working.

Aug 21, 2009 | 2003 Nissan Altima

1 Answer

Fuel gauge not working on alfa gtv 1998


Sounds as though the tank sensor is faulty. Access through top of petrol tank, note the wiring colours and position. Lift out and check condition of float and the rheostat wiring and slider. Get a replacement from EB spares

Nov 13, 2008 | 2000 Alfa Romeo GTV

1 Answer

1989 Saab 900 low level fuel light


You don;t say whether the fuel gauge is reading accurately, or whether it's always on empty. If the gauge is always showing empty, it's most likely a problem with the sending unit in the fuel tank. Check the resistance across the two terminals of the sending unit.

On a C900, the fuel sender level unit is separate from the fuel pump and located on the right side top of the tank, accessible by removing the trunk floor lift up panel (the pump is located on the left side top of the tank.
Possible problems are: electrical line off or broken, float not working (it's fairly delicate); or gauge not working.

Test the resistance of the sending unit with the lines disconnected, the resistance should be 2.6 to 3.8 ohms full tank, 63.3 to 67.5 ohms empty tank; and test for voltage across the top of the sender unit, if no voltage, that's likely the problem!

If the gauge is otherwise reading accurately (showing 'full' for a full tank, etc) then the problem is likely a gauge malfunction and can be simply replaced.

Good luck!

Saabreur

Jul 10, 2008 | 1989 Saab 900 4 Door

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