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I have one that I use regularly on the property and is simple....Hijack time Tony!!!
Transfering water, siphoning fuel, etc...
Rather then try and suck it through and get a mouth of fuel just simply put a hose into the tank that you want to transfer from and add another 2-4 feet into the tank as well.
The liquid will come up the hose and stop at level with the liquid that is in the tank.
Put your thumb over the end of the hose and quickly pull out the hose downhill into the other tank and release thumb just as get to the lower tank.
You have now kept the liquid at the same level as it was in the tank and no air can get in from the top side. The bottom side has sucked up more liquid too and the gravity takes over....
That's my claim to fame anyway and I use it all the time. Patent number 47569-A AB PTY LTD, fines up to 1 million dollars for use of this idea and possible gaol time!!!