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Are you having fuel gauge reading issues?

  • Yes

    Votes: 6 19.4%
  • No

    Votes: 25 80.6%
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Discussion Starter · #1 ·
I've set this poll up to see if there is an ongoing issue with the reading on the fuel gauge as it pertains to actual fuel consumption. This one is just a basic poll designed as a yes or no answer. However, if you have another issue with the fuel gauge in general, feel free to post up with that particular issue as well. If there are enough other issues, I can create another poll to further distinguish between the issues...if needed.

For reference, the original thread discussion is located here:
http://www.ducatisupersport939.net/forum/113-ducati-supersport-939-general-discussion/6953-fuel-level-readings.html
 

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Discussion Starter · #2 ·
Doesn't yet seem like this is a major issue...which is GOOD. Keep the votes coming, if possible, though.
 

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I wonder if the voters understand the issue. I don't like how the bars drop inconsistently. It's full and then a couple miles later I lose 2-3 bars within 10-15 miles of each other
 

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I wonder if the voters understand the issue. I don't like how the bars drop inconsistently. It's full and then a couple miles later I lose 2-3 bars within 10-15 miles of each other
When I'm down to three bars they will go down to one after about 30 miles but from full it seems fairly consistent.
Although when I filled up today it was on one bar and said I had 9 miles left, but I brimmed it and only put in 13lts so there should have been 3lts left in the tank, about 25-30 miles.
 

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I'm pretty much indifferent to the bars as an indication of the amount of fuel left. The differentiation between, say, four or three bars is almost too small for me to see. But I've found the Range display to be very useful. It will vary, sometimes quite a bit, based on speed and gear, but the fuel light will come on consistently with a range of 30 to 33 miles left. I have Range selected more than any other possibility.

Pjk
 

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When I'm down to three bars they will go down to one after about 30 miles but from full it seems fairly consistent.
Although when I filled up today it was on one bar and said I had 9 miles left, but I brimmed it and only put in 13lts so there should have been 3lts left in the tank, about 25-30 miles.
Yeah, same thing here. Haven’t had any issues with the bars dropping quickly initially but certainly I seem to get down to 1 bar very quick. Yesterday I was out for a shortish ride, started with the tank a little over half full perhaps. After no more than 60-70 km, I was already down to one bar. When I filled up (after another 15-20 km), I could only get just above 12 liters in the tank so there should’ve been almost 4 liters left in the tank (good for some 50-60 km more). Seems to me I should get back to using the trip meter and manual calculations to see how far I can get on one tank, rather than trusting the fuel gauge.
 

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Mine’s generally consistent...but there have been a couple of instances reported on the Forum (and elsewhere like with Multistradas), where the fuel sensors have completely failed.

The only time mine has been inconsistent is when the tank is almost full (e.g. one bar down), and then when I topped it off on a couple of occasions it didn’t show completely full (still down one bar). But after running the fuel down to almost empty and refilling, the gauge properly showed full again.
 

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I had an issue a week ago when I was taking out in cold weather (42F). It didn't work right until I filled it up a 2nd time. I thought about his thread.
 

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Mine performs consistently but IIRC there is a precipitous drop right around the half tank mark that isn’t consistent with a steady rate of fuel consumption.
 

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Mine performs consistently but IIRC there is a precipitous drop right around the half tank mark that isn’t consistent with a steady rate of fuel consumption.
My guess is that’s because the inside of the tank doesn’t have a constant width. I.e. when the _level_ of gas in the tank is in the middle, that might actually correspond to anywhere between 40-60% of actual capacity. However, unless Ducati programmes the fuel sender with a non linear curve, it may appear that the fuel is decreasing faster or slower for certain segments of the fuel gauge. Especially if the tank is narrower at the “middle level”.

That said, I don’t think I’ve observed the same myself. What I did notice was that the fuel gauge needed to be taught by running the bike until the tank is almost empty (thanks to @Ed K for the tip). Before it was less consistent and the range remaining was also much less accurate.
 

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Mine performs consistently but IIRC there is a precipitous drop right around the half tank mark that isn’t consistent with a steady rate of fuel consumption.
Typically when I fill up it says I have 165 miles range, then it's usually gone in about 120 miles. The fuel warning comes on with about 35 miles remaining range. Usually getting 41-42 mpg.

My question, is there any reserve when the tank goes to the bottom? Or is totally empty?
 

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Mines consistent but consistently funny. It stays on full for a long time. Maybe the first 75-100km and then after that it gradually will drop down to 1. It seems like it goes down consistently after the lag it has where it shows that it's full for the first half of the tank.
 

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What I did notice was that the fuel gauge needed to be taught by running the bike until the tank is almost empty (thanks to @Ed K for the tip). Before it was less consistent and the range remaining was also much less accurate.
Well in that case, I can say I’ve done my bike a lot of teaching :grin2: . I’m surprised I haven’t stranded myself at least a half dozen times.
 

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My guess is that’s because the inside of the tank doesn’t have a constant width. I.e. when the _level_ of gas in the tank is in the middle, that might actually correspond to anywhere between 40-60% of actual capacity. However, unless Ducati programmes the fuel sender with a non linear curve, it may appear that the fuel is decreasing faster or slower for certain segments of the fuel gauge. Especially if the tank is narrower at the “middle level”.

That said, I don’t think I’ve observed the same myself. What I did notice was that the fuel gauge needed to be taught by running the bike until the tank is almost empty (thanks to @Ed K for the tip). Before it was less consistent and the range remaining was also much less accurate.
I have seen that issue where after half way point, the drops isnt gradual. Regarding training, i always run it till i getting fuel light on.
 

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Mines consistent but consistently funny. It stays on full for a long time. Maybe the first 75-100km and then after that it gradually will drop down to 1. It seems like it goes down consistently after the lag it has where it shows that it's full for the first half of the tank.
Yup, me too. Which is why its all the more shocking when after past half way mark the drop rate picks up.
 

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I have seen that issue where after half way point, the drops isnt gradual. Regarding training, i always run it till i getting fuel light on.
To be fair, there’s still 25% left in the tank when the fuel light comes on.
True, but I don't feel confident enough to drag it longer. Have done it a few times though when I didn't have the option
 

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I don't seem to have issues with the fuel gauge bars my fuel light usually comes on at 2 bars, but I often run it to the last bar before re-fuelling
Regarding the "Range" indicator & varying issues some have mentioned I think are due to how you use the throttle. eg. if you are riding hard on the throttle then the range will obviously drop as apposed to if you are just cruising , or constantly on & off the gas, if that makes sense .
 

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OK, I looked it up in the book. It says the total capacity of the tank (including the "reserve") 16L or 4.23 Gallons. The reserve portion is 1.1 gallons or 4 L.

I'm still confused. Does that mean when the range goes to zero that 1.1 gallons are left? I've never put in more than 3 gallons and change.
 

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OK, I looked it up in the book. It says the total capacity of the tank (including the "reserve") 16L or 4.23 Gallons. The reserve portion is 1.1 gallons or 4 L.

I'm still confused. Does that mean when the range goes to zero that 1.1 gallons are left? I've never put in more than 3 gallons and change.
Thats a good question. The fuel light definitely comes on when there’s four liters left. Initially, my fuel gauge was also at only two bars briefly and then switching over to one bar very quickly. However, it seems to have changed once I ran the tank down to about two liters left a couple of times. Now it stays on two bars much longer (which makes sense, given that there’s eight bars on the display so two bars would equal four liters). Range remaining was definitely inconsistent but has never showed zero when the low fuel light comes on but rather a number in the 20-30 km range, which is much less than actual range.

In short, no, range shouldn’t be zero when low fuel comes on.
 
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