How to Replace an Audi S4 Fuel Pump Relay

1. Locate your fuel pump relay. Look in your owner's manual. If you can't find the information there, look under the hood for a power distribution box that contains fuses, circuit breakers and relays. The cover should lift off after loosening the snaps. Your fuel pump relay should be marked, or it may be diagrammed on the inside of the cover.
2. Pull the relay out of the socket by lifting up on it. You don't need any tools.
3. Push the new relay into the socket after lining up the pins to mate with the socket. It will fit only one way, so you can't make a mistake.