Both pump are wired together of the same pin of the relay.Interesting. I don't think that mine does that. I think that it only comes to life after my car is running. Doesn't the main pump get a signal from the coil when the car is running for safety purposes just in case the car flips over and the motor stops the main pump will shut off? What you are saying is as long as the key is on the main pump will turn on. That does it with my series 2 spica setup but not with my series 3 bosch.