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Offline halbie

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Re: Fuel level indicator problem?
« Reply #20 on: April 17, 2019, 03:10:27 PM »
Fuel range number is accurate. Iíve tested it a bunch. Yes, it will vary as your riding varies, but not significantly, and you can account for it. 

Iíve had the range estimator below 15 miles several times (and Iím pretty sure below 10), and Iíve done that using mile markers and odometer to confirm itís accuracy as that number counts down. 

Iím not stupid about it when Iím off in the middle of nowhere, which is not a hard place to be in eastern Oregon. In those situations I plan  trips carefully to make sure fuel is available.
« Last Edit: April 17, 2019, 03:12:44 PM by halbie »

Offline Oop North John

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Re: Fuel level indicator problem?
« Reply #21 on: April 17, 2019, 03:13:40 PM »
Accurate range to empty readings certainly give me a good feeling. Never run out on a bike / car with one 😁

Offline Corey

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Re: Fuel level indicator problem?
« Reply #22 on: April 17, 2019, 07:50:10 PM »
A few years back, I dropped my truck off to a friends and put my GPz in the back, and rode it home. Like that scene on Dirty Harry...
"I Gots-ta Know", I filled the tank, strapped a filled gallon gas container on the back, and headed for home. Ran out of gas about 8 miles from home, and now I know the absolute range, but would never push it that far. 4.8 gallon tank and about 210 miles total. Now every vehicle I own, I just fill it, drive it till the reserve light comes on, record the mileage, and know my range.

I agree, the issue with the warning light coming on at about 1/2  tank should be corrected. Does the Service Manual state when this warning light should come on?
1985 GPz550 (current ride since 2003)
2003 SV650s (Racebike)
Z900RS (Before 2020)

Online Mastrocinque

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Re: Fuel level indicator problem?
« Reply #23 on: April 21, 2019, 12:22:52 PM »
Ok, so I took the bike for a (beautiful) ride yesterday and went as far as I dared on a single tank. I also marked down the readings of the fuel level indicator as I went along so I could share here to try and add something to this thread.

I took the marks when the fuel bar went down and didn’t come up again (which happened a LOT when the indicator was changing between 6 and 5 bars).

Some of the conclusions:
- Yes, the fuel level and the range marker don’t go hand to hand; the level is a LOT more pessimistic
- As in many other bikes and cars, to make the first fuel bar go down, you have to ride a lot longer than to make the other ones down
- Luis, even though the behavior of my bike is similar to yours, it seem that your Z is way more off on the fuel level than mine. I would report to Kawa

Here is what I got (first in the metric system and then in miles/US gallons too):

metric
6 bars, trip 0, tank full
5 bars, trip 77 km (+77 kms)
4 bars, trip 112 km (+35 kms)
3 bars, trip 144 km (+32 kms)
2 bars, trip 171 km (+27 kms)
1 bar, trip 203 km (+32 kms)
Blinking bars, trip 256 km (+53 kms)

Tank fueled when trip was at 310 kms, 14,63 Litters

Average fuel consumption calculated by the bike = 21,7 km/l
Average fuel consumption calculated manually = 21,2 km/l

miles and US gallons:
6 bars, trip 0, tank full
5 bars, trip 47.8 miles (+47.8 miles)
4 bars, trip 69.6 miles (+21.7 miles)
3 bars, trip 89.5 miles (+19.9 miles)
2 bars, trip 106.3 miles (+16.8 miles)
1 bar, trip 126.1 miles (+19.9 miles)
Blinking bars, trip 159.1 miles (+32.9 miles)

Tank fueled when trip was at 192.6 miles, 3.865 gallons

Average fuel consumption calculated by the bike = 51.04 miles/gallon
Average fuel consumption calculated manually = 49.87 miles/gallon
« Last Edit: April 21, 2019, 12:24:57 PM by Mastrocinque »
Paulo Mastrocinque

Offline Ove

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Re: Fuel level indicator problem?
« Reply #24 on: April 21, 2019, 01:19:43 PM »
Not as scientific,. Yesterday at last bar flashing, I did about 10 more miles before fuelling up. Range was saying 37 miles left and the tank took 13.45 litres, about 3 UK gals (4.5l to a gal).  The gauge bars had felt like they'd dropped steadily with no sign of jumping unexpectedly at any point.

Tank is 17.2 litres, so approx 3.7 litres left (just over 0.8 gal) and averaging mid 40s mpg, an estimate of 37miles to empty is near enough. Conclusion: My readings seem good enough, I'm happy to rely on what its telling me, even allowing for my vagueness around average mpg during the ride.

Offline Corey

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Re: Fuel level indicator problem?
« Reply #25 on: April 21, 2019, 02:50:17 PM »
According to the parts diagram on Kawasaki.com https://www.kawasaki.com/parts it looks like the float/rheostat system is used, and is part of the fuel pump assembly. Does it state somewhere in the manual when the low fuel warning light is supposed to come on?



1985 GPz550 (current ride since 2003)
2003 SV650s (Racebike)
Z900RS (Before 2020)

Online Mastrocinque

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Re: Fuel level indicator problem?
« Reply #26 on: April 21, 2019, 03:57:38 PM »
*Originally Posted by Corey [+]
According to the parts diagram on Kawasaki.com https://www.kawasaki.com/parts it looks like the float/rheostat system is used, and is part of the fuel pump assembly. Does it state somewhere in the manual when the low fuel warning light is supposed to come on?

Yes!

Here it is:
The lowest segment and fuel level warning indicator blink in the multifunction display when approximately 3.9 L (1.0 US gal) of usable fuel remains. Refuel at the earliest opportunity. If the vehicle is on the side stand, the warning indicator cannot estimate the amount of fuel in the tank. Stand the vehicle upright to check the fuel level

In my case, the last bar started flashing with 4,9 liters (1.3 gallons).
Paulo Mastrocinque

Offline Ove

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Re: Fuel level indicator problem?
« Reply #27 on: April 21, 2019, 07:26:06 PM »
@3.9l that means the range reading should be around 38 to 40 miles / 60-65km roughly. My flashing fuel guage came on with a range indicating just under 50 miles, suggesting my fuel guage is also flashing at 4.5l to 5l remaining

Online Mastrocinque

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Re: Fuel level indicator problem?
« Reply #28 on: April 21, 2019, 07:48:11 PM »
Overall, the range indicator is more accurate.
The fuel level indicator though is way off...

Is not a big deal, but it shouldnít be rocket science making a fuel level indicator more precise.

In the end, you learn the behavior of it and adapt...but imagine if half a tank reading actually meant half a tank!! Wouldnít that be something?

Lol.....
Paulo Mastrocinque