As a full time cruiser, I have to move gas a fair bit. Into the dink fuel tank and into the honda put-put.
I made up a spare fuel line with a squeeze bulb. It has a 2' hose on the intake and an 8' hose on the output. I can move gas from jugs on the rail to any tanks. If the dink is in the water then a syphon will run automatically once I start. The honda sits a bit higher so a syphon will not work. 100 squeezes gives me a gallon.
I put a brass hose barb in the end so I can stick the other end on when done and contain spills.
There are other devices similar to a squeeze bulb available in auto parts stores that will move more fuel.