Before any flammable liquids are loaded or unloaded, the engine should be: Do you currently have car insurance? Insurance is mandatory to drive in Ohio Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question Before any flammable liquids are loaded or unloaded, the engine should be: Answers Turned off. Revved. Turned on. Drained of oil. Explanation 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. This questions appears in the following tests: Colorado HazMat Georgia HazMat Georgia Tank Kansas HazMat Kansas HazMat Massachusetts HazMat New York HazMat New York HazMat North Dakota HazMat West Virginia Tank Wyoming HazMat