"...good manually powered siphon pump system..."

There are a bunch available. Black and Decker makes (or at least used to) a thing called a Jackrabbit Pump, a hand powered (crank) pump that works very well. There are also those that are powered by an electric (think battery) drill, mucho faster than hand pumping. But again, remember that the hatch to the fuel tank is going to be locked, so you have to start breaking stuff...