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Hello all,
I've been restoring my 2010 FXDWG for some time now. It is basically a good machine other than some additions made by the previous owner that have been put back to stock. (Ape bars, risers, pipes. etc.)
That said, the one item that appears to be inoperative is the low fuel light. I understand that this is generated from the float position on the fuel level sender (75219-09). Obviously, I can replace this unit but before I do, I was wondering if there is the possibility of other faults that might be corrected.
I need to check the speedo for any code(s) but I've not yet done that (my bad).
Yes, I discovered that the bulb for low fuel is present and working. Last nght I did a code check in the DIAG section with the reset button on the speedo and all of the lamps illuminated for an instant just before the DIAG section opened. (low fuel appears as a yellow gas pump).
That tells me that the bulb is OK and that the problem is downstream in the variable resistor section of the 75219-09 fuel pump sender inside of the fuel tank next to the pump. Apparently, part of the resistor track is either missing or corroded so that when the float is at the bottom (1 gallon or less, i.e. low fuel) there is no resistance sent to the speedo to illuminate low fuel.
By the way, the only "code" received was P55Pe6. (top of "e"missing) Both Google and other HD sites tell me that this is not a code. LOL
So, once the sender is removed, I will test the resistance pins for the fuel gauge with my VOM and see where the fault lies. The senders are available on eBay and elsewhere both new and guaranteed good used. I have all of the manuals, e.g. Electrical Trouble shooting, etc.
Thanks again! I'm on my way! LOL
Last edited by FX WideGlide; Jun 24, 2025 at 09:33 AM.
I discovered that the bulb for low fuel is present and working. Last nght I did a code check in the DIAG section with the reset button on the speedo and all of the lamps illuminated for an instant just before the DIAG section opened. (low fuel appears as a yellow gas pump).
That tells me that the bulb is OK and that the problem is downstream in the variable resistor section of the 75219-09 fuel pump sender inside of the fuel tank next to the pump. Apparently, part of the resistor track is either missing or corroded so that when the float is at the bottom (1 gallon or less, i.e. low fuel) there is no resistance sent to the speedo to illuminate low fuel.
It is not unheard of that the "resistor track" (a variable resistor, also called a rheostat) can get corroded if top tier fuels are not used or fuel sits for a long time in the tank.
In the Corvette community, it was frequent that an in tank fuel gauge would stop working for that very reason. The fix on a corvette forum I used to frequent, was to add a Techron additive to the fuel. Numerous cases cleared up after a tank or two of adding the Techron additive.
You may want to try the Techron fuel additive before disassembly.
If already disassembled, if the rheostat looks to be complete, but possibly corroded, you can try cleaning it with an electrical contact cleaner. Then check to see if the ohms scale changes and/or reads better/smoother/more consistent.
It could save you the need to buy another one...
You appear to be on top of this issue, keep us posted on the results...
It is not unheard of that the "resistor track" (a variable resistor, also called a rheostat) can get corroded if top tier fuels are not used or fuel sits for a long time in the tank.
In the Corvette community, it was frequent that an in tank fuel gauge would stop working for that very reason. The fix on a corvette forum I used to frequent, was to add a Techron additive to the fuel. Numerous cases cleared up after a tank or two of adding the Techron additive.
You may want to try the Techron fuel additive before disassembly.
If already disassembled, if the rheostat looks to be complete, but possibly corroded, you can try cleaning it with an electrical contact cleaner. Then check to see if the ohms scale changes and/or reads better/smoother/more consistent.
It could save you the need to buy another one...
You appear to be on top of this issue, keep us posted on the results...
Hello Hattitude!
Yes, I think that you well may be correct in regard to corrosion over the entire resistor track insomuch as the low fuel is not working at all (other than appearing as "present " briefly in DIAG mode). The unit has to come out in any case so that will be the first order of business.
In Harley's defense, they do recommend higher grades of fuel. No 87 octane, but rather 89 or 91. Sadly, here in California we are stuck with alcohol additives with possible corrosion at hand.
I wil keep you all posted once confirmed as this is apparently a common issue with HD.
Regards.
Last edited by FX WideGlide; Jun 24, 2025 at 11:49 AM.
Before removing the fuel level sending unit, try this. Remove the fuel gauge from the tank remove the connector from the gauge and clean the contacts on the gauge and inside of the connector. Reassemble and test the low fuel level light. It may save you the hassle of removing the whole fuel sending unit assembly.
I once removed the fuel send unit from my 2000 FXDWG, it is difficult to get it out of the tank without bending it. Your 2010 model may be easier though.
Before removing the fuel level sending unit, try this. Remove the fuel gauge from the tank remove the connector from the gauge and clean the contacts on the gauge and inside of the connector. Reassemble and test the low fuel level light. It may save you the hassle of removing the whole fuel sending unit assembly.
I once removed the fuel send unit from my 2000 FXDWG, it is difficult to get it out of the tank without bending it. Your 2010 model may be easier though.
.
Good idea. That can be the first step to a fix. If it desn't work, no harm. Thanks!
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Low Fuel Light Missing.
