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LOW GAS SIGNAL FLASH EVEN WHEN THE TANK IS FULL

WHEN I FILL UP THE GAS TANK THE LOW GAS SIGNAL FLASHES ON THE INSTRUMENT PANEL.

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The gas pump is going out, change gas pump

Posted on Nov 08, 2008

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My fuel gauge just quit working in my Oldsmobile Alero. It reads empty and the low fuel light stays lit. Any ideas


it's probably the gauge is bad or the sending unit in the fuel tank is bad ,one or the other . The wiring doesn't usually go bad , usually ! What year is your olds ?
Don't know if your aware of the complexity on new vehicles ,after 1996 . Most vehicles having more then one control module , PCM - engine- transmission control module , ABS - antilock brakes ,BCM -body control module , SRS - air bags etc... Are all hooked together by a serial data communication network . It the case of your fuel gauge signal .
The instrument panel cluster (IPC) displays the fuel level as determined by the powertrain control module (PCM). The IPC receives a class 2 message from the PCM indicating the fuel level volume. The fuel gage defaults to E (empty) if:
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The PCM detects a malfunction in the fuel level sensor circuit.


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The IPC detects a loss of class 2 communications with the PCM.

When the fuel level is less than 14 percent, the low fuel indicator illuminates.
The best place to start , instead of guessing , would be to hook up a GM factory scan tool ,Tech 2 scan tool ! This would be done to see if the PCM is receiving a voltage signal from the fuel sending unit in the fuel tank . An to see if it is sending a signal to the instrument cluster .
Don't get me wrong here , there are other ways to check it ! The PCM supply's the fuel sending unit with a 5 volt reference voltage , the sending unit is what they call a potentiometer ,with the level of the fuel , it will send back a voltage signal less then five volts . The PCM will know what the fuel level is by that voltage an send it to the I / P cluster . There are videos on you tube on how to check it ! You can go to radio shack or some other electronics store an purchase different resistors ,Then find connector C-413 C413 -- 16 cavity
Fuel tank/canister vent/wheel speed sensor harnesses to body harness, under the right rear of the vehicle, near front of the gas tank. We have a special tool here at the dealer ,a signal generator
Connect the J 33431-C Signal Generator and Instrument Panel Tester between the signal circuit and the low reference circuit of the fuel level sensor on the male terminal side.
Then install the resistors one at a time to check different fuel levels , one for 1/4 , 1/2 ,3/4 an full ! Good luck hope this helps

Aug 18, 2015 | Oldsmobile Cars & Trucks

2 Answers

Low oil pressure warning


It sounds like the oil pressure sending unit is going bad. Sometime they're called oil pressure switches. That would be my first guess. Why its proportional to 1/4 segments of gas portions makes very little sense. Fuel level sending units work as semi circular resistance sweep. Not in segments the only thing that segments fuel protions are the lines on your instrument panel gauge. Anyhow check the fuel pressure switch.

Feb 23, 2013 | 2006 Ford Taurus

1 Answer

Warning light for low fuel stays on


The sensor is part of the fuel pump module inside the gas tank.
The signal is sent to the body computer, so it could be a faulty module or a problem with the body computer.
The circuit would need to be checked with a meter.

Feb 08, 2013 | Volkswagen Cars & Trucks

1 Answer

I have a Toyota Echo 2004 , the fuel tank indicator on the instrument panel stop working even if the car is completely full the ligth is on , indicating low fuel.


There is a flotation operated sender inside the gas tank, which provides information to the gauge.
Either your sender has died or become corrupted by taking on gas, or the gauge has died. Probably easier cheaper and faster to have the gauge checked out at a dealer than to pull the tank out. Might be a common problem on that model or year. Ask a dealer service department how much to figure it out.

Oct 08, 2010 | Toyota ECHO Cars & Trucks

2 Answers

I have jsut purchased a 2001 chevy silverado extended cab. I went to fill up the tank of gas and the low fuel light came on and it wont register the full tank of gas. There are only 49k miles on the truck....


it is the fuel level sender. the board will wear and cause it to lose signal; in certain spots. will need to replace the sender to fix problem. it will start registering once you burn some gas off. full is just where it drops out

Sep 27, 2010 | Chevrolet Silverado Cars & Trucks

1 Answer

Fill up on gas - the gauge goes to full. next time starting van, the gauge goes to 1/4 tank. once the DTE was still accurate and this time went to ---. what could cause this.?


I would look for a loose wire in the gauge circuit, most probably on the tank unit. The other possibility is the instrument panel voltage regulator which supplies regulated voltage the the panel gauges. Mostly these are built into the fuel gauge, so if faulty, the gauge itself will have to be replaced.

May 01, 2010 | 2005 Kia Sedona

1 Answer

Recently put a full tank of gas in 199 sl2, now the low fuel light is on and the gas gauge shows empty. what to try next


Assuming nobody stole all of your gas, the fuel level sending unit is bad, the wiring to it is bad, or the instrument panel is failing.

The wiring can be accessed inside the trunk, on the left side, by pulling the carpeting up. The sending unit should read about 35 ohms when full and 235 ohms when the tank is empty. My Haynes manual says the wires are Purple, and Black-White.

If the sending unit reads correctly then the wiring to the instrument panel, or the panel itself is malfunctioning.

If it is the sending unit: the sending unit is attached to the fuel pump inside the fuel tank. You must remove the fuel tank to replace it. While you are in their you might as well put a new fuel pump in.

Jan 05, 2010 | 1999 Saturn SL

1 Answer

Gas had moving from full to empty after i fill up


sending unit in tank may be shorting out or the wire to tank is shorting try removing plug connection and applying some electrical cleaner and plug in and remove 4 or 5 times to clean plug contacts they may be dirty worst case replace sending unit in tank.

Jul 01, 2009 | 1998 Pontiac Grand Prix

1 Answer

Gas gauge - Doodge Caravan 2000


Probably easier to replace fuel tank sender unit as constant on off condition heard or not cant be good .Potential electrical spike.

Feb 15, 2009 | 2000 Dodge Caravan

1 Answer

Hyundai Accent 2003 - gas pump clicks off when tank isn't full.


possible cause could be evap canister full of gas causing back up

Feb 08, 2009 | 2002 Hyundai Accent

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