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Fuel gage is not working properly sometimes it read low fuel and sometimes full

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Probably fuel pump about to go out. This happened to me and about 2 mo.s later, fuel pump had to be replaced. Bad thing is, it is in the the fuel tank.

Posted on Jul 30, 2010

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Posted on Jan 02, 2017

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My temperature & fuel gauge doesn't work how to troubleshoot


To troubleshoot, I need year--make--model, vehicle sold in the US.
I'd check the coolant temp sensor and wiring circuits. The same thing for fuel gage sending unit. Sometimes for the fuel gage sending unit, I get a couple of resistors one represents empty, the other represents full. If the gage reacts properly then the problem should be the sending unit in the gas tank.

Jan 26, 2018 | Cars & Trucks

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2004 trailblazer...fuel guage tags full when empty....rears Reads empty when full...changed fuel sending unit...no fix....replaced instrument cluster....no fix. Help


Have the vehicle check for DTC'S - diagnostic trouble codes ! The sending unit is an input to the PCM - engine computer . The PCM sends this info to the instrument cluster over class 2 serial data network . Do you know anything about class 2 communication's network . The ideal way to diagnose a problem like this , check for codes , view data on scan tool . Buick Class 2 Operation Diagnosis 1998

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 ECM 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 ECM.
When the fuel level is less than a pre-determined value, the IPC illuminates the low fuel indicator.

DTC P0463

Install a scan tool.
Turn the ignition ON, with engine OFF.
With the scan tool, observe one of the following fuel level parameters:
• Fuel Level Sensor parameter in the PCM Enhanced EVAP data list.
• Fuel Level Sensor parameter in the PCM EVAP data list - 4.2L only.
Does the scan tool indicate that the Fuel Level Sensor parameter is less than the specified value?

Feb 19, 2017 | Cars & Trucks

2 Answers

Fuel guage wont read


The wire to the sender in the fuel tank is shorted. If it was open or disconnected it would read full.

Feb 12, 2014 | 1989 Chevrolet C1500

1 Answer

Fuel guage not working


Testing the fuel gage requires accessing the harness from the fuel pump and grounding the yellow / white wire with 160 ohms resistance this should cause the gage to read full, and with the circuit open you should have the gage reading empty. If the gage works in this order then the likely failure is the sending unit in the tank , and will require replacement.

May 30, 2010 | 1999 Ford Expedition

1 Answer

Fuel gauge not give proper reading.. register full


Sorry to say,but the fuel sending unit is the problem,the fuel tank will have to be lowered out of the vehicle to replace the unit.If the fuel sending unit is not available by itself you will have to replace the whole fuel pump assembley.

Oct 14, 2009 | 1999 Buick Regal

2 Answers

1996 Plymouth Grand Voyager Fuel Gage issue


It sounds like the fuel level sending unit located on the fuel pump is malfunctioning. The solution for this is to have it replaced. You can do this yourself but I wouldn't recommend it as the vehicle needs to be lifted and the fuel tank needs to be dropped out. This can be preformed for about 100-150 in most shops.

Jan 20, 2009 | 1996 Plymouth Voyager

1 Answer

Fuel gage wont read past 1/2 mark when using fuel


it is the pontimeter in the fuel sender you can buy it seperate from the whole assembly and they had alot of problems with them please rate -jeff

Aug 21, 2008 | 1998 Chevrolet C1500

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