Hi Blue, found that thread when researching pump problems and, like you, didn't think there was one as not shown on the wiring diagram. Anyway, don't think it can be that as have power to the connector at the side of the tank. Research showed some people had a problem with the earth pin on the multi pin connector on top of the pump having a bad connection. Childminding today so haven't had a chance to take the cover off the pump but will investigate after golf tomorrow. If connector looks ok will try hard wiring the pump to see if it works - was researching replacements on CC parts site and unclear which model I have but astounded that one was £500! Grateful for all the helpful advice on here but am sure that if I've power to the pump it can't be ecu, relay, immobiliser, etc but either pump connection or faulty pump.