Believe it or not, Dave and I have never filled either of our cruising boats at a fuel dock. Nope, every bit of fuel has gone into a jerry jug and then through a Baja filter* and into the tank.
And we jerry jug the gas for the dinghy. And until we got the watermaker recommissioned, we jerry-jugged our water. Now, our watermaker fills a jerry jug and we pour it into the water tank.
At roughly 40 pounds apiece, those 5-gallon jugs get heavy to hold up and pour in. But since we learned about these nifty little shaker siphons, we don’t pour them. And we don’t get fuel in our mouth starting the siphon, either. BONUS: They don’t spill like some of the “environmental” spouts do!
The metal end is a check valve — the fluid can go into the tube through it, but not back through the valve. Start with the container you’re transferring from higher than where it’s going (the bigger the height difference, the faster the flow will be). Put the end with the check valve into the container you’re transferring from, the other end where you want it to go, and then jiggle the check-valve end up and down a few times (each time, more liquid will come into the tube) until it finally gets running downhill and the flow continues on its own.
Since it’s easier to show than explain, here’s Holly Scott of Charlie’s Charts:
Where to get your own? My number one choice is Charlie’s Charts since Holly went to the trouble of making a video to show how they work. You can also get them many other places, including Amazon. If you want to use one for both fuel and water, be sure to get two and label them both.
One final note: don’t try to use these to siphon gas out of a gas. Car gas tanks have some sort of anti-siphon device in them to defeat thieves. They defeat owners, too.
*A Baja filter is a three-stage filter that gets out particles and water. Unfortunately, the original Baja filters are no longer being made. These Mr. Funnel filters are the closest thing I’ve been able to find.