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I have a 2003 Fatboy fuel injected. I recently got the fuel gauge repaired. After leaving the dealer, I put 170 miles before the fuel light came on. I filled the tank to the top, and it only took 3.1...


Yes, your fuel gauge was not properly repaired in all likelihood. Take it back and advise them of this. ALSO:



When the ignition switch is ON the fuel gauge is connected to 12 VDC, current flows through the gauge and the variable resistor in the fuel gauge sending unit to ground. The sending unit float controls the amount of resistance in the variable resistor. Malfunctioning fuel gauges may be the result of a fuel gauge sender or a fuel gauge not being properly grounded OR there may be a defect in the fuel gauge sender or in the fuel gauge itself OR there may be an open circuit caused by a loose or disconnected connection or a broken wire between the ignition switch to the fuel gauge.



A suspect fuel gauge system can be tested by FIRST removing the gauge and grounding the Y/W wire of the fuel gauge sender located at the bottom of the gauge, turning the ignition switch ON at which point the fuel gauge must indicate FULL. And if it does so then the fuel gauge is functioning correctly.And if it does not read FULL then get a multimeter set to the RX1 scale and measure the resistance of the sending unit by placing one of the meter probes on the Y/W wire and the other probe on a good ground. THEN for Softail if the fuel tank is full, the reading should be 27-40 ohms. an empty tank should have a 240-264 ohm resistance and a half full tank will be approximately 97-118 ohms. FOR ALL MODELS if there is a very highmeter resistance or infinity reading the sender may be "open" or not grounded. In this case check to see if the sender and fuel tank are grounded by placing one of the ohmmeter probes on the flange of the sender and the other probe on crankcase and if the ground is good the meter must indicate one ohm or less and if the reading is one ohm or less the sender is defective and requires replacement and if a higher resistance reading is obtained you will need to check for a poor ground wire. THENyou can check the voltage to the O/W (+) wire and the BK (-) wire of the fuel gauge connector if the gauge did not indicate FULL and the correct reading will depend on the source voltage and the level of fuel in the tank or the position of the sender float arm on the variable resistor etc. If there is NO battery voltage present there may be a broken, highly corroded or disconnected power wire. If you cannot find a problem using the above testingreplace the gauge itself.

May 04, 2014 | 2003 Harley Davidson FLSTF Fat boy

1 Answer

My 2003 Fatboy's fuel light comes on, but the tank will only take about 2.5 to 3 gallons of fuel.


When the ignition switch is ON the fuel gauge is connected to 12 VDC, current flows through the gauge and the variable resistor in the fuel gauge sending unit to ground. The sending unit float controls the amount of resistance in the variable resistor. Malfunctioning fuel gauges may be the result of a fuel gauge sender or a fuel gauge not being properly grounded OR there may be a defect in the fuel gauge sender or in the fuel gauge itself OR there may be an open circuit caused by a loose or disconnected connection or a broken wire between the ignition switch to the fuel gauge.



A suspect fuel gauge system can be tested by FIRST removing the gauge and grounding the Y/W wire of the fuel gauge sender located at the bottom of the gauge, turning the ignition switch ON at which point the fuel gauge must indicate FULL. And if it does so then the fuel gauge is functioning correctly.And if it does not read FULL then get a multimeter set to the RX1 scale and measure the resistance of the sending unit by placing one of the meter probes on the Y/W wire and the other probe on a good ground. THEN for Softail if the fuel tank is full, the reading should be 27-40 ohms. an empty tank should have a 240-264 ohm resistance and a half full tank will be approximately 97-118 ohms. FOR ALL MODELS if there is a very highmeter resistance or infinity reading the sender may be "open" or not grounded. In this case check to see if the sender and fuel tank are grounded by placing one of the ohmmeter probes on the flange of the sender and the other probe on crankcase and if the ground is good the meter must indicate one ohm or less and if the reading is one ohm or less the sender is defective and requires replacement and if a higher resistance reading is obtained you will need to check for a poor ground wire. THENyou can check the voltage to the O/W (+) wire and the BK (-) wire of the fuel gauge connector if the gauge did not indicate FULL and the correct reading will depend on the source voltage and the level of fuel in the tank or the position of the sender float arm on the variable resistor etc. If there is NO battery voltage present there may be a broken, highly corroded or disconnected power wire. If you cannot find a problem using the above testing replace the gauge itself.

May 04, 2014 | 2003 Harley Davidson FLSTF Fat boy

1 Answer

The light does not work or the fuel gauge works it stays on empty


When the ignition switch is ON the fuel gauge is connected to 12 VDC, current flows through the gauge and the variable resistor in the fuel gauge sending unit to ground. The sending unit float controls the amount of resistance in the variable resistor. Malfunctioning fuel gauges may be the result of a fuel gauge sender or a fuel gauge not being properly grounded OR there may be a defect in the fuel gauge sender or in the fuel gauge itself OR there may be an open circuit caused by a loose or disconnected connection or a broken wire between the ignition switch to the fuel gauge.



A suspect fuel gauge system can be tested by FIRST removing the gauge and grounding the Y/W wire of the fuel gauge sender located at the bottom of the gauge, turning the ignition switch ON at which point the fuel gauge must indicate FULL. And if it does so then the fuel gauge is functioning correctly.And if it does not read FULL then get a multimeter set to the RX1 scale and measure the resistance of the sending unit by placing one of the meter probes on the Y/W wire and the other probe on a good ground. THEN for Softail if the fuel tank is full, the reading should be 27-40 ohms. an empty tank should have a 240-264 ohm resistance and a half full tank will be approximately 97-118 ohms. FOR ALL MODELS if there is a very highmeter resistance or infinity reading the sender may be "open" or not grounded. In this case check to see if the sender and fuel tank are grounded by placing one of the ohmmeter probes on the flange of the sender and the other probe on crankcase and if the ground is good the meter must indicate one ohm or less and if the reading is one ohm or less the sender is defective and requires replacement and if a higher resistance reading is obtained you will need to check for a poor ground wire. THENyou can check the voltage to the O/W (+) wire and the BK (-) wire of the fuel gauge connector if the gauge did not indicate FULL and the correct reading will depend on the source voltage and the level of fuel in the tank or the position of the sender float arm on the variable resistor etc. If there is NO battery voltage present there may be a broken, highly corroded or disconnected power wire. If you cannot find a problem using the above testing replace the gauge itself.

Apr 16, 2014 | 2006 Harley Davidson FXDBI Street Bob

1 Answer

Fuel gauge not working properly


Hi, Anonymous you could have a faulty sending unit or gauge, there could be a problem with your wiring. On models with the fuel gauge posing as a left-hand fuel cap the gauge is a press fit do not try to unscrew it, simply ample force lift up in a rocking motion to remove gauge. Disconnect wires to the gauge and with a set of positive and negative jumpers from the battery connect the positive jumper and flash the negative, gauge should peg full, if not replace the gauge. With a test light check for power to the sending unit, then remove the sending unit and manually operate the float arm slowly with the correct wiring hooked up to the fuel gauge and sending unit and the ignition on, the gauge should respond accordingly if not replace the float arm assembly. If your fuel gauge registers the incorrect amount of fuel in the tank you can try bending the float arm the necessary amount for a more accurate reading. For more information about your issue, please visit the websites below. Good luck and have a nice day. Gauges Part 5 How to Test Diagnose the System
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Feb 01, 2014 | Bajaj Motorcycles

1 Answer

Fuel gauge not working properly


Hi, Anonymous you could have a faulty sending unit or gauge, there could be a problem with your wiring. On models with the fuel gauge posing as a left-hand fuel cap the gauge is a press fit do not try to unscrew it, simply ample force lift up in a rocking motion to remove gauge. Disconnect wires to the gauge and with a set of positive and negative jumpers from the battery connect the positive jumper and flash the negative, gauge should peg full, if not replace the gauge. With a test light check for power to the sending unit, then remove the sending unit and manually operate the float arm slowly with the correct wiring hooked up to the fuel gauge and sending unit and the ignition on, the gauge should respond accordingly if not replace the float arm assembly. If your fuel gauge registers the incorrect amount of fuel in the tank you can try bending the float arm the necessary amount for a more accurate reading. For more information about your issue, please visit the websites below. Good luck and have a nice day. My gas gauge doesnt work on my scooter
One way to fix non responsive stuck gas gauge on 50cc gy6
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Jan 09, 2014 | Bajaj Motorcycles

1 Answer

Fuel pump wiring diagram


there is two things : fuel gauge and dash fuel gauge. The fuel gauge in tank rated to 0 to 90ohms.disconnect wire at the tank take a variable resistor connect it to wire .read the dash gauge if it move as you move the resistor. if ok fuel tank gauge is at fault

Aug 09, 2013 | 1998 Chevrolet K1500

1 Answer

Fuel Gauge stuck


Hi, Saurabh you could have a faulty sending unit or gauge, there could be a problem with your wiring. On models with the fuel gauge posing as a left-hand fuel cap the gauge is a press fit do not try to unscrew it, simply ample force lift up in a rocking motion to remove gauge. Disconnect wires to the gauge and with a set of positive and negative jumpers from the battery connect the positive jumper and flash the negative, gauge should peg full, if not replace the gauge. With a test light check for power to the sending unit, then remove the sending unit and manually operate the float arm slowly with the correct wiring hooked up to the fuel gauge and sending unit and the ignition on, the gauge should respond accordingly if not replace the float arm assembly. If your fuel gauge registers the incorrect amount of fuel in the tank you can try bending the float arm the necessary amount for a more accurate reading. For more information about your issue, please visit the websites below. Good luck and have a nice day. DOWNLOAD Bajaj Pulsar 180

Aug 18, 2012 | 2007 Bajaj Pulsar 180

1 Answer

How to replace fuel gauge on 1984 Grand Marquis


Are you sure its not the fuel sending unit and not the fuel gauge itself.Because the sending unit controls the fuel gauge level and if the float gets stuck then the fuel gauge will not work.

Jun 26, 2012 | 1984 Mercury Grand Marquis

1 Answer

How do you install a fuel gauge on a 2004 H-D fatboy


If the bike came with a fuel gauge, no problem. Just work the fuel gauge up out of the tank. It's held in by a rubber o-ring. The wires under it are very short so be careful. The sender unit is inside the tank. You'll have to determine which is the problem piece and replace it.

If your bike did not come with a fuel gauge, you'll have to purchase a left side fuel tank if that's the location of the original fuel gauges. I do not know where Harley puts the fuel gauges on the Softails. If they have a fuel gauge on them, they are fuel injected. I do not work on fuel injected bikes, carbs only. Sorry.

Good Luck
Steve

Jan 10, 2011 | Harley Davidson FLSTF Fat boy Motorcycles

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