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Question:

Your engine runs a pump when you are delivering compressed gas. Should you turn off your engine before or after you unhook the hoses after finishing that delivery?

A Turn it off before unhooking.
Explaination

If your engine is required to be on when you are pumping a load of compressed gas, you are always adding an extra layer of danger to a situation. As soon as the delivery is completed, make sure that you turn off the engine before you unhook any hoses.