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Re: Fuel Level circuit in gas tank - Dangerous? - Put my mind at ease please.
The gauge measures the resistance of that rheostat, and it applies a VERY minimal voltage to do it. ~5v DC which is nowhere close to enough to cause a spark.
Even if it does spark, there would be an almost zero chance of starting a fire.
If you have any fuel in the tank, the vapor concentration is far past what you can ignite. (gasoline doesn't burn at all. gasoline vapors burn, and it has to be between 1 and 7% vapor to air. Any more or less and it won't do a thing)
The only time you would get that low of a concentration of vapor in the tank is if it is absolutely empty, in which case you aren't moving the sender anyway.
Hope this helps...
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