Actually, there are SOME pumps that do shut off when pressure is reached ("all" is a dangerous word). These are the positive displacement bellows type pumps. I have one on my Jag (factory) and it slows and stops as it comes up to pressure. At idle it ticks slowly, and faster as engine draw increases. Unfortunately, they are not very reliable, and most of the modern pumps you can get for reasonably money are continuous running.
Rant/defensive comment coming:
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expensive for you poor boys but hey its a Porsche deal with it
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Confused, as long as you are throwing mud and calling us all cheap, why did you cheap out and get the cheesy Amurican pump instead of buying the proper Bosch pump that was originally used on the 914/6 or 911s with Webers? What's the matter couldn't afford it?
Rant off.