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Yamaha fuel/speed gauge, is it possible for ONLY the fuel portion of gauge to go bad?

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Yamaha fuel/speed gauge, is it possible for ONLY the fuel portion of gauge to go bad?

Old 02-24-2013, 02:12 AM
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Default Yamaha fuel/speed gauge, is it possible for ONLY the fuel portion of gauge to go bad?

THe fuel portion of the gauge on my flats boat quit working. This is on a round multifunction yamaha speed/fuel gauge.

I replaced the tank sending unit, but no change.

Is it possible that the just the fuel portion of the gauge is bad or do I have a wiring issue I need to find?
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Old 02-24-2013, 07:40 AM
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Yes, it is possible for the fuel portion of the gauge to go bad. But, not likely.

At the back of the gauge there is a white wire with a male bullet connector on the end. Or, at least that is the configuration when the gauge left Yamaha. That wire connects to the wire (usually pink) that runs to the tank sender.

Disconnect the connector. Turn the key to the ON position. The fuel bars will go full up or full down. I can not remember which. Then, get a short piece of wire and jumper the connector at the end of the white wire to a good ground. Wait a moment or so and the fuel bars will then go all the way in the opposite direction. This will determine if the gauge is working, or not.

If the gauge is known to work properly then you have a wiring to the sender issue or a wiring from the sender to ground issue.
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Old 02-24-2013, 10:54 AM
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Perfect, that's exactly the info I was looking for to test it. Thanks
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