Question about 1988 Isuzu Trooper 2 Door

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Fuel gauge at empty low fuel light on. yes theres fuel in it

Just bought an 88 Trooper 2. The fuel gauge is down below empty and the low fule light is on. I put gas in and no change. Does anyone know if these two devices are in series or wired parallel? Is light dependent on gauge? I'm looking for some easier answers first before I drop the fuel tank and pull sending unit out.

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  • ronniecmth Oct 11, 2008

    I have the same problem on my '90 Maxima either check all the fuses or fill up the gas, light stil on. Some body plase help me out.

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The only thing that will cause this is the gas guage sending unit.

Posted on Sep 29, 2008

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On a 99 grand am the gas gauge allways reads empty what is the color is the ground wire for the gas gauge


It's not the ground wire , the gauge grounds inside the instrument cluster .Your sending unit or the gauge it's self is bad .
Body Control System Operation
The Body Control Module (BCM) performs the following functions:
?€¢
Gauge control


?€¢
Instrument cluster indicator control


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Fuel gauge control


?€¢
Temperature gauge control


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Theft deterrent


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Exterior and interior lighting control for the following lamps:


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Automatic lighting control


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Fog lamps


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Interior lighting


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Battery rundown


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Chime


Gauge Control
The Body Control Module (BCM) receives Class 2 serial data messages from the Powertrain Control Module (PCM) to determine the following gauge information:
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Engine coolant temperature


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Fuel level sensing


Your best bet is to take your vehicle to a qualified repair shop !
Fuel Gage Inaccurate or Inoperative

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Select the PCM display DTCs function on the scan tool.
Does the scan tool display any DTCs?
--
YES - Go to Diagnostic Trouble Code (DTC) List (2.4L) or Diagnostic Trouble Code (DTC) List (3.4L) in Engine Controls
NO - Go to Step 3

3

With the scan tool, select Instrument Panel Cluster, Special Functions and command the fuel gauge UP.
Does the fuel gauge complete a full sweep when commanded?
--
YES - Go to Step 4
NO - Go to Step 12
  1. Turn OFF the ignition.
  2. Disconnect the fuel level sender.
  3. Connect the J 33431-C Signal Generator and Instrument Panel Tester between the signal circuit of the fuel level sender and the ground circuit of the fuel level sender.
  4. Turn ON the ignition, with the engine OFF.
  5. Important: Verify the J 33431-C resistance setting with a DMM.
  6. Set the resistance on the J 33431-C to 40 ohms.
Does the fuel gauge display at or below empty?
--
YES - Go to Step 5
NO - Go to Step 6

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1 Answer

2003 chevy malibu gas gauge always on empty, replaced the fuel pump


Need to replace the sensor inside the gas tank. I have a 2008 Malibu with the same problem. It was a faulty fuel gauge sensor.

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1 Answer

Wiring diagram 2006 fordranger diesel pickup


Hi , there will be 3/4 wires at the fuel tank gauge. 1 ground wire ,1 gauge(on dash) wire, 1 gauge low level indicator light (warning on dash) Get a test lamp , ground test lamp and probe each wire. 1 will do nothing (earth wire) 1 will bring on dash low fuel light , the other will be the gauge on the dash which will rise (slowly) to the full position.

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1 Answer

Today while I was driving, The instrument where it telles you how many miles left till empty read 27mi. all of a sudden it started counting down rapidly, within seconds it had went from 27 mi to 4mi left...


Sounds like float in fuel tank is sticking. Usually caused by using cheap gas. Fill it up and add a bottle of STP gas treatment. It might take more then one tankful w/STP to clean it completely. TIP: don't rely on the computer generated "mileage left" especially when that low on fuel, that is only an estimate. And also don't let it get that low on a regular basis because it will damage your fuel pump, fuel is used to cool electric pump in fuel tank and running it that low will shorten the life of your fuel pump.

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fuel level sensor is part of the fule pump assembly. code is telling you sensor is malfuctioning. do gauges work? if yes i would leave problem alone till you need a fuel pump

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1 Answer

2000 buick century custom. fuel gauge fluctuates between empty and 1/2 when level falls below 1/2 tank. low fuel light works. problem sending unit (how hard to change), gauge, or other?


The sender unit has a fine resistance wire with a slider to read the level, the slider or wires are worn and making intermittent contact, the low fuel light is a seperate switch so it will still work.access to the sender is usually under the rear seat cushon, under the soundproofing and a cover, have a look and describe what you have .

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1 Answer

Fule pump


Generic to most pump controls, down increases pressure. If you are going to do this, I suggest you get a pressure gauge and connect it to the system and find out what the recommended pressure is. Turn adjustment in small increments 'till you reach proper pressure.

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Fuel gauge in 2001 Aztek 140k miles doesn't work.


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