As a lawyer would say on a courtroom trial show on TV "asked and answered". You pump until you get the amount of suction you want then you stop.
It's the opposite of blowing up a balloon. You puff and puff until the balloon is full, then you stop. After the balloon loses some of the air, you puff a little more to refill it.
It's the opposite of blowing up a balloon. You puff and puff until the balloon is full, then you stop. After the balloon loses some of the air, you puff a little more to refill it.