Before loading or unloading flammable liquids, the engine should be: Before you start the test, please answer the question below regarding your insurance status. Without insurance you will not be able to drive in Ohio Do you currently have car insurance? Yes I have insurance. Great, you're all set! Click here if you still want to compare rates. No, I need insurance and I want to compare options. Question Before loading or unloading flammable liquids, the engine should be: Answers Turned off. Revved up. Left on. Explanation Unless you must run the engine to operate a pump, you should always turn off the engine before loading or unloading flammable liquids. This questions appears in the following tests: Arizona Tank Arkansas HazMat Iowa HazMat Maryland HazMat Missouri HazMat New Mexico HazMat New Mexico HazMat New Mexico Tank Oklahoma HazMat Oklahoma HazMat Utah HazMat Virginia HazMat Virginia HazMat