Siphoning all the fuel out will be difficult if not impossible dut to the unusual tank shape. Even hot wiring the pump to drain it that way won't completely empty it so you might as well just take it off and turn it upside down to empty through the filler cap. Doesn't take that long.
Put 12V on the plug towards the fuel pump and split the fuel line into a canister. If you have a 570S it is even simpeler; just turn the key of your ignition.
In 2 minutes your tank will be completely empty without getting the tank off :cheers:
