My Corsa has only done about 37,400 miles and was running really lovely until the other week when the fuel wasn't pumping to the engine injection system. I have been advised it needs a new sender unit, which I think contains the pump, but I cannot find anywhere to purchase a replacement part. If I can't find a sender I will have to sell the car. Can anyone suggest a supplier for the sender which I think has to be 3psi.