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The first thing to check is do you have a 12v feed to the pump when you work the switch?.If not then the problem is in the switch or wiring somewhere.
If you have 12v,then check you have an earth on the other motor connector.
Did you test the motor across a battery?
I'd rather push my Alfa than drive a BMW....
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo