Question about 2003 Harley Davidson FLSTF Fat boy
Hi Rking733, you could have a faulty sending unit or guage, 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 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. For a free wiring diagram please visit the website below and good luck.
Harley Davidson Wiring Diagrams and Schematics
Posted on Jun 18, 2015
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Posted on Jan 02, 2017
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