Beckson's answer is the patented Siphon-Mate pump; a combination displacement lift pump and siphon pump with valves suitable for transferring fuel. Pump half strokes to start flow. Once flow begins, fully extending the handle will allow siphoning provided that the source is higher in elevation than the receptacle.
Supplied with clear tubing to allow versatile application. Cut tubing for desired length of intake and discharge hose. When finished siphoning or pumping flammable liquids, be sure to drain siphon pump of liquid before storing. This pump not intended for transfer of liquid over 120 degrees F (49 degrees C) nor solvents that will attack PVC. Safety experts caution against the unsafe practice of siphoning petroleum by mouth, warning specially, that it can result in loss of life.