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What sort of ground are you using it on? I've got one of the low Clarke ones with the long handle and if I'm using it on my drive then even that's hard because the jack sinks into the drive and can't roll. So it's trying to drag the car as well as lift.
Put a switch in somewhere on the power to the fuel pump and hide it somewhere. If they do get it started at least they won't get very far with it before it runs out of fuel.