Question about 1999 Ford Expedition

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When we fill up the tank the gas level indicator only goes to about 1/2 and the digital doesn't go as high as it used to. the dollar amount is about the same as it used to be so I think the tank is really full. Can I fix this or does it need a professional mechanic?

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The sending unit in the fuel tank is shot or it has a loose baffle pressing against the float to the sending unit

Posted on Sep 03, 2010

Testimonial: "thank you! it sounds like I need to take it in since I would not trust myself to remove the tank"

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Posted on Jan 02, 2017

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2006 Chevy Colorado Truck. Gas tank filled and fuel gauge indicator dropped to 1/4 full, when truck is idling fuel gauge drops to empty and low fuel light comes on. Suggestions? Thank you.


Check and or test fuel gauge sending unit and the gauge . Videos on youtube showing how to . Also i would have the vehicle checked for DTC's - diagnostic trouble codes . You may want to think about taking to a qualified repair shop .

Fuel Gage
The instrument panel cluster (IPC) displays the fuel level as determined by the engine control module (ECM). The IPC receives a serial data message from the BCM indicating the fuel level percent. The fuel gage defaults to empty if:
• The ECM detects a malfunction in the fuel level sensor circuit.
• The IPC detects a loss of serial data communications with the BCM.
• The BCM detects a loss of serial data communications with the ECM.

DTC P0461
The fuel level sender changes resistance based on fuel level. The powertrain control module (PCM) monitors the signal circuit of the fuel level sender in order to determine fuel level. When the fuel tank is full, the sender resistance is low and the PCM senses a low signal voltage. When the fuel tank is empty, the sender resistance is high and the PCM senses a high signal voltage. The PCM uses the signal circuit of the fuel level sender in order to calculate the total remaining fuel percent in the tank. The PCM sends the fuel level percent via the class 2 serial data circuit to the instrument cluster in order to control the fuel gage. The fuel level information is also used for misfire and evaporative emission (EVAP) diagnostics.

DTC P0462 Fuel Level Sensor Circuit Low Voltage
DTC P0463 Fuel Level Sensor Circuit High Voltage

Jan 01, 2017 | 2006 Chevrolet Colorado

1 Answer

The digital guage on my 2001 Cadillac Deville Sedan is not reflecting the correct amount of gas in the car. I looked at the Driver Information Center and the fuel left over said 99.9 empty, when it would...


The problem needs to be properly diagnosed, but the most likely cause of your problem would be a malfunctioning fuel level sensor in the fuel tank. It could also possibly be a problem with the wiring to the sensor.

Jul 09, 2011 | 2001 Cadillac DeVille

2 Answers

Ran out gas put gas in it still wont start


If you run out of gas in this truck it will quickly destroy a fuel pump, the electric pump is located inside the gas tank, it is tiny and to do its job it uses the gasoline it is immersed in for cooling, if you run the tank below 1/8 tank level the pump is going to run hot, if you run out of gas the pumps rotor bearings get very hot and if the pump gets hot enough the rotor seizes up. Also when you run out of gas it takes more than 1 gallon to get the pump to prime again, 3 gallons minimum is the least amount. The bottom line here is that you will more than likely need to pull the fuel tank and replace the fuel pump.

Apr 17, 2011 | 2005 GMC Sierra 2500HD 4WD

2 Answers

How can i get to the fuel tank send unit only reads half full


well if you have it an empty fuel light came on to your dash, then you have travelled and just consumed the whole entire reserved gas in your tank, so when you are filling it up again, it will fill-up first the reservoir for your reserved gas then if it reach the minimum level of gas in your tank, then the fuel sensor unit will tell you now the exact amount of gas level on your gauge just keep filling it up (gas), DO not Press the entire trigger of the pump, just press it half way and moderate while filling -up gas so wont stop clicking and you thought that you have your tank full already but it was not.

Jan 22, 2011 | 2000 Mercedes-Benz S-Class

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How many miles can i drive once the fuel idiot light goes on in my '84 Cressida?


Available mileage will vary greatly by vehicle and conditions, and could range from as low as 10 miles to as high as 100. To avoid serious damage to your engine and fuel system you should never let the fuel level get below 1/4 tank.

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1 Answer

Gas gage not working


If everything else works, then the problem is the fuel level sensing/sending unit which is located inside the gas tank. Repair/replacement of the unit is a time consuming, messy job that usually requires removing the fuel tank. On a 93, the removal may cause or reveal other problems, and could cause you to replace the entire tank. Unless you want to toss $200 to $500 dollars into the car, I recommend that you use the trip odometer to estimate fuel usage, and fill up when you estimate you're down to 1/2 tank.

Jan 01, 2010 | 1993 Plymouth Sundance

1 Answer

I have a 1994 dodge ram 1500 slt. and the gas gage will not read the amount of gas in the gas tank and gas light stays on when I know the tank is full. leaving me wondering how much gas i run on sometimes....


The problem is with the sensor inside the gas tank since the method of indication used is by passing an electric current & the resistance to that current is a measure of level of liquid in the tank , i.e. the gauge consists of two parts:
  • The sensing unit
  • The indicator
The sensing unit usually uses a float connected to a potentiometer. As the tank empties, the float drops and slides a moving contact along the resistor, increasing its resistance. In addition, when the resistance is at a certain point, it will also turn on a "low fuel" light on some vehicles.
However if this float gets stuck to the bottom of the tank or a leak fills up the float making it sink to the bottom of the tank, thus always indicating 'E' for empty.........................sodeep

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1 Answer

Gas gage not working, gas tank seems full but it is not


You will need to remove the fuel tank from the truck and replace the fuel pump/fuel level sensor module that is inside the fuel tank. Use extreme caution when doing this as there is a real fire hazard.

Aug 16, 2017 | 2005 GMC Envoy Xl

1 Answer

Gas tank?


It sounds odd that both cars are experiencing the same problem. This usually indicates a problem with the gas tank not venting properly.

Nov 20, 2008 | 2002 Mercedes-Benz C-Class

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