The best way to start the syphon is to obviously put the end in your bucket (or where ever the water is going to run to), stick the other end in the tank and fill the vacuum tube with water. Then raise the vacuum end up so that the water starts flowing out. Once it starts running down, just stick it back in the water and the water will start flowing on it's own (the gravity of the water runnig out will "suck" the water for you). I never suck on mine to get it started. It may take you a time or 2 to get the hang of it but it definitely works.