The fuel level sender is just a variable resistor. There should be 1 wires going to the sender. The resistance is that felt from the sense wire to ground. As the level changes the voltage dropped across this resistance changes and in turn is registered on the gauge. The easy way to check the sender is to measure the resistance from the sense wire to ground. Be careful not to accidentally measure the resistance of the 12v supply. I seem to remember that the typical moeller float senders are 300 ohm? So you should see between 30 and 300 ohms and most likely at half full something close to 150 ohms.
Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Jul 22, 2016 8:47 PM, "Franklin Schenk via CnC-List" < cnc-list@cnc-list.com> wrote: Is there a simple way to check out the fuel level sensor to see if it is working properly? The fuel gauge reads zero even though the tank is about half full. Frank _______________________________________________ This list is supported by the generous donations of our members. If you like what we do, please help us pay for our costs by donating. All Contributions are greatly appreciated!
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