21 se fuel sending unit

[Ponr]

Has anyone replaced the fuel sending unit on their 21se? Need to know the part number or model used? Mine is reading full. I was replacing the gasket and may have broke something we putting it back in as it was in a tight spot.

 

[Brent]

You can


Disconnect the sender wires at the sending unit.
Connect the 2 wires to an ohmmeter or multimeter and set signal to resistance.
Take measurement of the sender at empty and full positions.
This can be done by either draining and then re-filling the tank which the sending unit is installed, or remove the sending unit from the tank and then manual operate the float by hand.
For American Standard, the meter will show 240 ohms at empty and 30 ohms at full.
For European Standard, the meter will show 0 ohms at empty and 180 ohms at full.


Is ground or bonding wire intact?


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[Brent]

Another fuel sender article

https://www.boatingmag.com/checking-boa ... ing-units/


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[Brent]

https://pbase.com/mainecruising/fuel_sender_testing


Another article


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[warthog5]

Pull the sender....Stick a tape measure in the tank...Measure it's depth.

Then get one of these for the proper depth tank. Note......Sender will measure 1in shorter than your tank depth measurement.


https://www.westmarine.com/buy/moeller- ... ecordNum=2

 

[Ponr]

Thanks Brent and Warthog! Replaced the sending unit and back in business now.