Here’s a nearly fool proof way of siphoning fuel, from a Portable Jerry Can, to your Boat’s Fuel Tank
; with little chance of getting it anywhere but in the tank where it belongs.
First, make sure you have a sufficient length of hose. That usually means as much as 10 feet or more. I use 3/8 inch clear tubing so I can see what's happening.
1. Place the full Portable Jerry Can as high on the deck
or coaming as practicable, near the Boat Fuel Tank deck
2. Push the hose into the Portable Jerry Can so the end is at the bottom of the Jerry Can. Make sure the end is under the surface by blowing into the hose and listening for a bubbling noise
in the Jerry Can.
3. Make a long loop of hose, such that it goes from the Jerry Can down beneath the level of the Deck Fill, and comes back up to a point well above the top of the Jerry Can.
Picture an asymmetrical sine wave, where the Jerry Can is at elevation “+1", the Deck Fill will be at elevation “0", the lower (bottom) loop at elevation “-2", and the free end (where you suck, then fill) at elevation “+5".
4. Now suck! Watch as the fuel comes up into the hose and starts to flow over the first (upper) loop (elev +1.5) , and into the (lower) bottom loop (elev. -2) . It will then start to fill the hose until the gas in the hose reaches the level of the gas in the Can.
If you keep the free end of the hose high enough (elev. +5) nothing will ever come out.
5. Pinch off the open free end. This will maintain a column of fuel in the hose.
6. Place the free end into the Deck Fill, and watch the fuel siphon from the Jerry Can into the Boat’s Fuel Tank. When you feel that you have enough fuel in the Boat’s Fuel Tank, simply raise the hose above the level of the gas in the Jerry Can - and the fuel will stop flowing.
Some siphon kits come with a priming ball. This priming ball is a soft, pliable rubber ball on one end of the siphon tube that can be used to start the siphon. To use one of these, you will need to plug
the end of the tube near the open end (at the deck fill), and squeeze the rubber ball. Air bubbles should be forced out of the siphon into the Jerry Can. If you release the pressure on the ball while keeping the end of the siphon closed, then the fuel should be sucked into the siphon and over the lip of the Jerry Can where it can begin to flow down into the fuel tank (as soon as you release your finger). However, you will have to release your finger quickly after the fuel reaches the lip of the Jerry Can, because if air has a chance to get to the top of the tube, the siphon will not flow.
The Super Siphon: http://www.alaskapowersports.com/mall/super_siphon.htm
To start the siphoning action all you do is insert the end of the hose that has a one way check valve in it, into the tank that you want to siphon from, insert the other end into the tank you want to siphon to - move the check valve end of the hose up and down a couple of times in a rapid motion, and the hose automatically starts to siphon. The hose length is 6' with an inner diameter of ½" and can be used on any chemical that does not attack the plastic of the hose.
Fermtech Auto Siphon Pump: http://www.northernbrewer.com/siphon.html