If you need to make repairs on your Jet Ski, it is a good idea to drain the fuel tank before you begin. You don’t want leaking fuel or accidental starts while you’re working. Unfortunately, most personal watercraft, such as Jet Skis and Sea-Doos, do not include a plug for draining the tank easily. You can begin siphoning by sucking one end of a hose. But it’s much safer to use a manual siphon pump.
Turn off the motor, remove the key and let the craft sit long enough that the engine and the tank cool down. Siphoning hot fuel could be dangerous and cause burns.