I have a 2500 gallon water tank I use for irrigation, and the outlet valve handle broke, which of course happened when it was full to the brim.
Now to siphon the contents out in a controlled manner with a regular 3/4" garden hose would work, but would take about a month, and anything larger than 1/2" or 3/4" you just don't have enough lung power to start the siphon, hence the tip.
Take your hose, in my case it was about 1 1/2" diameter, tie a nut or something heavy to a length of cord and drop it through the hose. Remove the nut and tie a piece of a rag onto the string, put the hose end with the string into whatever liquid you want to siphon and pull the string with the rag on the end through the hose, and it will act like a pump and the siphon will start.
Not sure if there's a maximum hose diameter but 1 1/2" was no problem and the tank was empty in about 3 hours..
Last edited by NMNeil; 13-07-24 at 20:22.