Fuel gauge surrenders when hot - Ducati Supersport 939 Forum
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post #1 of 148 (permalink) Old 05-25-2018, 02:54 AM Thread Starter
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Fuel gauge surrenders when hot

The past two days my fuel gauge has been going a bit haywire. Fuel tank is full and yet all of a sudden the fuel indicator shows completely empty tank with blinking indicator light. I have noticed that this only occurs when the engine gets warm. Sweden has lately had an extreme heat wave (praise the lord) and when I drive the bike to work (around 18 deg C, no traffic) there is no problem, but when I drive back home (around 25-30 deg C and traffic) and the engine gets up to about 90-100 deg C, thats when the fuel indicator shows empty. After I got back home yesterday I parked the bike for about an hour and then headed out again. First 3 minutes fuel indicator was fine but then showed empty again once engine got up to 80 deg C.


Has anyone else encountered this issue? Ideas? I've contacted my dealer.


/Kara
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post #2 of 148 (permalink) Old 05-25-2018, 08:03 AM
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As I recall, there was only one other reported issue with the fuel gauge, but cannot locate it at the moment.

I’ve ridden my bike in very hot and humid weather, without issue.

Sounds more like a sensor issue, but have you had the under-tank wiring warranty service done yet?

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post #3 of 148 (permalink) Old 05-25-2018, 09:50 AM
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Quote:
Originally Posted by Ed K View Post

Sounds more like a sensor issue, but have you had the under-tank wiring warranty service done yet?
I must have missed this one....was there a recall or issue with the wiring??

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post #4 of 148 (permalink) Old 05-25-2018, 11:48 AM
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Originally Posted by Hugg727 View Post
I must have missed this one....was there a recall or issue with the wiring??
There was a TSB issued for wiring inspection under the tank for a potential pinch. TSB calls for inspection of harness for damage, and rerouting the harness to prevent future damage. It's not a recall, and it can be performed during your next normal servicing at a Ducati dealership at no additional cost to you.
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post #5 of 148 (permalink) Old 05-25-2018, 02:43 PM
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Quote:
Originally Posted by Ed K View Post
As I recall, there was only one other reported issue with the fuel gauge, but cannot locate it at the moment.

I’ve ridden my bike in very hot and humid weather, without issue.

Sounds more like a sensor issue, but have you had the under-tank wiring warranty service done yet?
That’d be me.

OP: “Stored in my living room for the winter: First ride of the season (Michigan), I’d gone to put in fresh gasoline, putting on 20+ miles, continued to ride and just after 30 miles, my low fuel warning light came on (continued to flash) and the bar gauge also kept flashing empty. Rode home, got off the bike to open the garage and all that went back to working properly. Informed the dealer I was coming down and after just 8 miles, again with all that. Picked it up today and maybe ten miles, again. I was told that the sensor wasn’t plugged in all the way/properly. So much for that!”
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post #6 of 148 (permalink) Old 05-26-2018, 09:30 AM
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Quote:
Originally Posted by OffAxis2018 View Post
That’d be me.

OP: “Stored in my living room for the winter: First ride of the season (Michigan), I’d gone to put in fresh gasoline, putting on 20+ miles, continued to ride and just after 30 miles, my low fuel warning light came on (continued to flash) and the bar gauge also kept flashing empty. Rode home, got off the bike to open the garage and all that went back to working properly. Informed the dealer I was coming down and after just 8 miles, again with all that. Picked it up today and maybe ten miles, again. I was told that the sensor wasn’t plugged in all the way/properly. So much for that!”
Thanks. Btw, still need to bring it back to be fixed?

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post #7 of 148 (permalink) Old 05-26-2018, 09:34 AM
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Quote:
Originally Posted by Hugg727 View Post
I must have missed this one....was there a recall or issue with the wiring??
https://www.ducatisupersport939.net/f...er-2017-a.html

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post #8 of 148 (permalink) Old 05-26-2018, 09:42 AM
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Thanks. Btw, still need to bring it back to be fixed?
Yes. Dealer is ordering a new fuel level sensor. I stumbled upon the TSB mention here after they decided to place said order.
My instance happened before the fuel tank mounting recall check inspection happened, which was mentioned to me before I put it away for the winter. That was the second reason I’d gone to the dealer, for both issues. Oh... & to add the disc lock too. Haha! Ugh!!
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Last edited by OffAxis2018; 05-26-2018 at 09:47 AM.
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post #9 of 148 (permalink) Old 05-29-2018, 11:58 PM
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This happened to me today! I got caught in a tortuous crawling traffic for four miles, a good 15-20 minutes and the engine got up average about 215F, hitting 220F. After getting past the accident which snarled traffic, I got to speed and got the engine about 190-200F but again back on the street it cliimbed to 210ish and the then the fuel light started blinking and the fuel gauges was all dashes. I was thinking to myself, there's no way I should've been this low on gas. I pulled into a gas station and sure enough, I could see the gas in the tank, about half full. I filled up, turned on the bike and it showed a full tank.

The manual says this this level sensor error, but why would prolonged heat trigger this? My 939 has been inspected for the gas tank fitment TSB.
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post #10 of 148 (permalink) Old 05-30-2018, 12:26 AM
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Man...this suckks. I had a similar incident, not flatlined though. I had my fuel gauge showing full or close to full, maybe one bar short. I rode to my dest., less than 3 miles, parked and got on with my stuff. When i came back, and started her up again, the gauge was at the half way mark. Thats 3 bars from when i parked! I have seen the bars drop randomly, not sure what it is.
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