Yes hand pump, DC volt pump 6-12v, pumps are designed for gas or glow you can't swap them or the rubber parts will be destroyed, for now you can pour your fuel into a squeezable container and adapt a tube and squeeze the fuel in, something like a catsup bottle with a pointed spout to push your hose on. There may be a half dozen different ways to get the fuel into your tank end result is the same whatever it takes and yes gravity siphon will work too just takes a long few minutes.