Question about 1999 Cadillac DeVille

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Fuel gauge not reading fuel levels correctly. Fuel gauge says full when tank is near empty.

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It is stuck io would put fuel cleaner in the tank and then i would if not i would replace it the floater is fowled up

Posted on Sep 12, 2010

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Posted on Jan 02, 2017

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1 Answer

Fuel gauge reads full when near empty and empty when near full


It's probably the sending unit in the fuel tank it is mounted in the tank alone with the fuel pump. Hope this helps.

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Why does my crysler 1996 reads fuel gauge full when it is empty


The fuel level sending unit inside the fuel tank is bad or the gauge is or there is a wiring problem This video is for a mercury vehicle , but all makes an models are the same . Repairing Fuel Gauge Problems 2004 Mercury Marquis EricTheCarGuy

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Why is my fuel gauge acting up?


Your fuel tank level sensor (also known as the tank float assembly) is failing. This usually happens due to corrosion or other contaminant getting into the potentiometer in the assembly.
These can be removed and cleaned, or can be replaced, but it's a bit of a job and usually requires removal of the fuel tank itself.

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06 chevy silverado gas meter reads wrog


If gauge is pegged full then while driving goes empty then full then 1/2 it is the circuit board inside the fuel tank that has gone bad. to get the tank to register correctly then you must remove tank remove fuel pump module the float arm can be adjusted to read correct level

Jun 02, 2014 | Cars & Trucks

1 Answer

Fuel gauge reads correctly then goes to empty


9 times out of 10 the fuel pump/level sender assembly is the cause. Sometimes the gauge pod is faulty, and there have been cases where there were either poor connector pin fit issues and/or chaffed/melted/cut wires in the harness that leads back to the fuel pump. It is an extremely common fault and would be surprised if the pump/level sender assembly wasn't the cause.

I hope this info helps!
~subyguru~

Sep 21, 2012 | 1999 Pontiac Grand Am GT

1 Answer

On my 2001 GMC jimmy sls,when the fuel guage gets near half full it drops to empty and lately when really full it reads empty until a few gallons are gone. What is the problem and how do I fix it?


you probably have a bad fuel level sensor in the fuel tank.you will have to remove the fuel tank to replace the sensor.the contacts on the sensor will break causing the fuel gauge to be inacurate.you can buy the sensor without having to buy the whole fuel pump assembly.

May 31, 2011 | 2001 GMC Jimmy

2 Answers

We just got a 1988 Porsche and filled with 1/2 tank, there was what seemed like overflow happening - Any idea what may be the problem.


fuel tank vent could be blocked by mud/pebbles etc, not letting the gas fumes escape while your adding fuel making it overflow, check underneath the car near the fuel tank .. something to start with..

Oct 10, 2009 | 1991 Porsche 944

2 Answers

Fuel gauge not working all the time.


This is a normal concern.
The instrument cluster uses 4 different operating modes to calculate the fuel level:
Anti-slosh (default mode)
Key OFF fueling
Key ON fueling
Recovery
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).
The key OFF fueling mode (2 seconds to read empty [E] to full [F]) requires 3 conditions be met:
The key must be in the OFF position throughout the entire refueling of the vehicle.
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:
The transmission is in PARK (P).
The key is in the RUN position.
At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
In key ON fueling mode, a 30-second timer activates after the transmission is put into the PARK (P) position (automatic transmissions). When the 30-second time has elapsed and at least 15% of the vehicle's fuel capacity has been added, the fuel gauge response time is 90 seconds to read from empty (E) to full (F). When the transmission is shifted out of PARK (P), the fuel gauge strategy reverts to the anti-slosh mode. The key on refueling mode prevents slow to read full events from happening if the customer refuels the vehicle with the key in the RUN position.
Recovery mode is incorporated into the instrument cluster strategy to recover from a missing fuel level input during a refueling event. Missing fuel level inputs result from intermittent opens in the fuel sender or its circuits. Recovery mode (empty [E] to full [F] approximately 20 minutes) is initiated when the following 2 conditions are met:
The instrument cluster is in the anti-slosh (default) mode.
The actual fuel level in the tank is greater than what is being displayed by the fuel gauge

Feb 18, 2009 | 1983 Mercury Grand Marquis

1 Answer

Fuel gauge is not reading


to the right , i am assuming to the "full tank" reading. am i right?

if i am right, the wire from the gas tank is sending a full tank signal what ever the content of the tank.

meaning the wire is shorted to ground.
or the sending unit is faulty. there is a short to ground reading between the sending unit.

you can test which one is faulty. remove the wire from the sending unit. observe the gauge. if the gauge would go to " empty" then the culprit is the sending unit. if it stays on " full tank", then the wire is faulty.

WARNING: GASOLINE IS EXTREMELY FLAMMABLE. BE VERY CAREFUL IN HANDLING NEAR THEM.


tnx 4 using fixya,

drcool

Sep 23, 2008 | 1997 GMC Sonoma

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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