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Fuel Gauge opposite reading

Old 02-23-2013, 11:57 AM
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Default Fuel Gauge opposite reading

Hello,

I bought a brand new fuel sensor and gauge from a shop and took it to my mechanic and installed it. I checked also the wiring and its correct. The problem is that the gauge started to show empty when it was full and as soon I started using the boat and the fuel was decreasing in the tank the gauge started to rise towards full

I also tried to cut the 2 cables going from the gauge to the sensor and from the sensor towards battery negative but again the reading is the same.

Can the gauge and sensor be incompatible?
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Old 02-23-2013, 02:14 PM
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One is euro/metric standard and the other is USA standard. The 2 different standards progress in opposite directions and different ohms range.

You need a matched-standard set of gauge and sender ( by any mfgrs), preferably USA at 240 ohms Empty down to ~33 ohms Full.

If that is what your new sender reads , replace the gauge with a USA standard one .

If the sender reads 10 ohms Empty and 180 ohms Full, replace the sender with USA.

Scroll down to Fuel Sender : http://faria-instruments.com/site_manuals/IS0085E.pdf

Edit: Oops. Reverse the above advice to end up with both gauge and sender conforming to Euro/metric standard as would likely be more appropriate for Cyprus. See below....
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Last edited by TTaxi; 02-23-2013 at 10:19 PM.
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Old 02-23-2013, 02:52 PM
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Originally Posted by TTaxi View Post
One is euro/metric standard and the other is USA standard. The 2 different standards progress in opposite directions and different ohms range.

You need a matched-standard set of gauge and sender ( by any mfgrs), preferably USA at 240 ohms Empty down to ~33 ohms Full.
Actually, given the OP's location, he might want to stick to the European standard, which is likely to be more commonly understood (such as by any future mechanics who might work on the boat) there.



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Old 02-23-2013, 07:19 PM
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When I bought my first boat (used) I commented to seller how it didn't use much fuel on the test drive. He responded he always kept the tank full and it did get pretty good mileage. He also told me he had the sending unit replaced recently so it was working well. When I went to fill the tank (100 gallon) I stopped at about 50 gallons as the tank was supposed to be near full and the gauge kept going lower. The fuel must have been going to the bilge I thought. Well it turned out the sending unit had been installed upside down. Just because a pro? installed it don't make it right. I'd pull it out and see if it will mount flipped over. Mine would and that was the solution. Good luck.
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Old 02-23-2013, 10:15 PM
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Originally Posted by Itteldoo View Post
Actually, given the OP's location, he might want to stick to the European standard, which is likely to be more commonly understood (such as by any future mechanics who might work on the boat) there.





Right!!! My mistake- I completely missed Koutroul's non-USA Cyprus home location. Just reverse what I said, to get both to Euro standard if that is preferred as is very likely. Sorry for the confusion Koutroul. Thanks Ittledoo.
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Old 02-24-2013, 05:33 AM
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Originally Posted by TTaxi View Post
Right!!! My mistake- I completely missed Koutroul's non-USA Cyprus home location. Just reverse what I said, to get both to Euro standard if that is preferred as is very likely. Sorry for the confusion Koutroul. Thanks Ittledoo.
Thanks! I will visit the shop and try to explain to the owner what happened because last week there was another customer who couldnt figure out what was going on so most probabaly he had the same issue too.
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Old 01-05-2019, 07:08 PM
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Default yamaha gauge

yamaha gauge 6y5 has the ability to be switched between american and european model. if accidentally switched to read european your fuel guage will read backwards. Simple fix just look at manual as to how to switch back... cheers
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