This is a REPAIR SERVICE on your original SBC control unit! NO FIX NO FEE - MONEY BACK GUARANTEED !!! IF for any reason your pump cannot be fixed, we offer a replacement pump IN THE SAME PRICE !!! Please read all description - any other question - please call us We are Mercedes Specialist and we are not the ones that are stating that. Customers come upset and they leave happy because we aim to deliver quality at a good price wich we know is a bit hard to get nowdays.