You do not need to run the car to test the pump; using electrical diagnostic tools like a Power Probe, you can unplug the pump and run it from the tool. Some Porsche specific scan tools can also activate it without the car running. And just be aware: It is standard procedure for parts outlets, and particularly dealers, to not accept any returns for ANY electrical or electronic parts; you buy it, you own it, so make sure you really need it first...
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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