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When a given volume of fluid moves through a restriction, it speeds up and the pressure drops (Bournelli effect). The "attaction" is really the higher outside pressure pushing against the lower presure in the faster moving fluid squirting through the gap between the hose and the bowl. This principle is what make carburetors work. It can also be demonstrated by taking a 3x5 card, a pin, and a spool of thread. Poke the pin through the middle of the card, inset the pin into the hole at one end of the spool, then blow through the other end of the spool. The card sticks to the spool because the air speeds up between the face of the spool and the card. The more air that goes through the spool, the harder the card sticks.
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2003 S manual
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