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Well I didn't know they worked on temperature, but a quick think leads me to believe that a dunking test won't work.
It can't work on a nominal temperature threshold, because the fuel temp will vary by several degrees depending on whether it's a frosty Scottish morning or standing in the Mediterranean Sun, with a similar range for the air within the tank.
It must work on the differential between the top and bottom of the sensor? (I'm guessing here.)
So dunking the whole thing in and out will not produce a differential.
Probably better to dip the tip into (say) cold water whilst holding the bottom with a warm hand (Oo er missus!)
Warning.. Do not take the test suggestion literally. I knew someone who badly scolded their feet whilst preparing a can of soup.
The instructions said .."Stand in boiling water for 5 minutes".
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