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

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