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Yamaha Fuel Gauge pegged to "F"

Old 08-26-2018, 07:17 PM
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Default Yamaha Fuel Gauge pegged to "F"

As the description says, I have a 2002 Yamaha Fuel Gauge (2 stroke) pegged on "f" when the key switch is turned on.. Attached on the other end is a 1 year old WEMA sending unit. How do I trouble shoot to find out what is going on.. I know the tank is empty..
Any assistance would be greatly appreciated.
Old 08-27-2018, 12:41 AM
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See if the gauge will drop to empty if you disconnect the sender wire. If not, -bad gauge.
If it does drop to empty, see if the gauge sender wire is attached to a ground at the tank. WEMA reverses the nearly universally-accepted ABYC wiring color coding almost every other manufacturer uses.

( ABYC says gauge to tank sender should be pink , and sender to neg ground should be black. WEMA says gauge to sender is black at the sender and sender to neg ground is pink or white, I believe. WEMA says you can reverse them if you want, but you have to make sure you are not connecting the gauge sender wire to ground. )

Check the resistance between the 2 sender wires ( disconnected ) , Empty should read ~~ 240 ohms and Full ~~ 33 ohms if it is an American standard resistance range sender. .

You could also disconnect the sender wire at both ends and insulate one end and use a test light or continuity buzzer to apply 12v + to the other end . If it indicates continuity, the sender wire may be chafed or broken and grounding out on the engine (I/B or I/O) block or tank.

If the gauge is USA standard and the sender is Euro , or vice versa, the gauge indicator movement will be reversed. Gauge and sender must be the same ohms resistance standard to read correctly.

IS0085d.pdf ( generic sender/ gauge resistance values)

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