A handy thing to have in your kit is a big syringe.
Drop into a stock feed place and grab a big horse one without the needle. Scrounge up a bit of nylon hose about 6" long. That way if you ever need to you can suck the water out of the bottom of the tank.
Rubber in the syringe doesnt like petrol much but it does the trick.
I had an old mower today, got nearly a full 60cc syringe of water out from under the petrol.
Bob.
