MX-5 Mk1 Electrical parts Home / Mazda MX-5 parts / Electrical parts MX-5 / MX-5 Mk1 Electrical parts Relay, fuel pump, Mazda MX-5 mk1 1.8, B57718821A, USED Relay, fuel pump, Mazda MX-5 mk1 1.8, B57718821A, USED £20.00 Excluding VAT Stock Status: In Stock Good, used, fuel pump relay, Mazda MX5 & Eunos Roadster mk1 1.8, 1993-98. UM00563. Add to wishlist Information Specifications Reviews Good, used fuel pump relay, Mazda MX5 & Eunos Roadster mk1 1.8, 1993-98. This is the relay that is under the dashboard. Denso part no. 056700-9721. A new one is over £70.00 from Mazda. UM00563. B57718821A Product Code: UM00563 Not yet reviewed Write an online review and share your thoughts with other shoppers! Be the first to review this product