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In general, before loading or unloading any flammable liquids, an engine should be:
A.  Turned off.
B.  Revved up.
C.  Turned on.
Before loading or unloading a tank with flammable liquids, you should turn off the engine, unless running the engine is necessary to operate a pump. Ground the tank before opening the filling hole and maintain the ground until after closing the filling hole.
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