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Posted by Fab
- July 12, 2025, 14:25:38 PMHi there,
I've been scratching my head for some time because I thought my 2001 Drifter 1500 was using too much fuel.
When I got it a few months ago, it was actually running a bit rich until I found out that the previous owner had replaced the original fuel pressure regulator with a more powerful aftermarket unit. I had the fuel pressure regulator replaced with a standard 3.0 bar unit and the rubber hoses to go with it, and replaced the vacuum and baro sensors with newer ones (probably wasn't necessary, but I found them for cheap). Then I cleaned the spark plugs of carbon residue, added a cleaning agent when refueling and thought all was well.
After refueling, the fuel gauge correctly showed "full".
After driving almost 95 miles, the gauge showed empty and I had to stop to refuel.
As you can imagine, I was very disappointed because this meant terrible fuel economy: 95 miles / 5 US gallons = 19 mpg....
But... this time I actually paid more attention to the exact amount of fuel I was adding... and I was very surprised to see that the maximum amount I could add was just a little over 10 liters or 2.65 US gallons. That translates to a mileage of 35.85 mpg or 15.25 kml, which isn't great compared to the 40-45 mpg some forum members are getting, but definitely better than 19 mpg. Also, I was mostly driving in city traffic, which probably had a negative effect on the mileage.
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Long story short, it looks like the fuel gauge is switching from full to empty even though the tank is still almost half full - the R1 should have a 5 gallon tank, as I've read here.
Do any of you know of a way to reset or calibrate the fuel gauge so that I get a more accurate reading?
Thank you and I apologize for the long post.