Gas Gauge allways FULL - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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  • 3 Post By DRVMN
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post #1 of 10 (permalink) Old 08-12-2019, 12:25 PM Thread Starter
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Gas Gauge allways FULL

2005 Softail Standard FXSTI Fuel Injected.

My gas gauge always reads full tank. Seems more like an electrical issue than mechanical.
Suggestions on what to check?

Thanks
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post #2 of 10 (permalink) Old 08-12-2019, 12:30 PM
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Check the float/potentiometer unit.

Troubleshooting procedure/resistance values in the Service Manual - Electrical Diagrams.

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post #3 of 10 (permalink) Old 08-12-2019, 05:03 PM
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Agree...sounds like stuck float.

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post #4 of 10 (permalink) Old 08-12-2019, 07:23 PM
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Look on the bright side . . . you'll never have to fill the tank and can ride forever!
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post #5 of 10 (permalink) Old 08-15-2019, 07:11 PM
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Your fuel sending unit may need replacing.

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post #6 of 10 (permalink) Old 08-15-2019, 07:37 PM
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Just had the same thing happen with my 2015 Street Glide Special. I was on the interstate and actually looking at my gauge when it suddenly went from 3/4 tank to full. I took it to my mechanic and he checked the sending unit which appeared to be ok, so he ordered a new gauge. When the new gauge came in, he plugged it in and started going through the calibration procedure. When it got down to about half tank, he heard an electrical pop sound and the new gauge went to full. He called the company he got the new gauge from and talked to an engineer who said the sending units can have a short along the travel of the potentiometer and when the float gets to that point, it will short out the gauge. At that point the gauge is shot. My mechanic started ohming out the wiring and found a wire shorted out between the sending unit and the computer. Once that was fixed, the sending unit and the gauge had to be replaced. they had both shorted out. He also found that the shorted wire changed colors under the fuel tank. Harley had evidently run out of that color wire and just spliced in something else under the tank. I would guess that your gauge is shot. Ohm everything out real good before putting another gauge in though.
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post #7 of 10 (permalink) Old 08-15-2019, 08:01 PM
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And that folks is why some of us don’t use the gas gage, we use the odometer.
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post #8 of 10 (permalink) Old 08-24-2019, 08:01 AM
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I just use my Azzometer. When it gets sore it's time to stop for gas...

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post #9 of 10 (permalink) Old 08-24-2019, 09:04 AM
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Quote:
Originally Posted by Phdharley50 View Post
And that folks is why some of us dont use the gas gage, we use the odometer.

Quote:
Originally Posted by norm9278 View Post
I just use my Azzometer. When it gets sore it's time to stop for gas...

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I use a combination. Which ever says I need to stop first.

Sent from here to there.
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post #10 of 10 (permalink) Old 08-24-2019, 05:39 PM
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I use a combination. Which ever says I need to stop first.

Sent from here to there.
Never forget the bladderometer, which seems to go fewer and fewer miles as I get older.
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