1. Open the hood of the van.
2. Locate the fuse and relay box, which is usually a black plastic box with a cover. It is often found near the battery or on the side of the engine compartment.
3. Open the cover of the fuse and relay box.
4. Inside the fuse and relay box, look for the fuel pump relay. It may be labeled as "Fuel Pump" or "Fuel Pump Relay." The relay is usually a small, rectangular device with several electrical terminals.
5. Once you have located the fuel pump relay, you can remove it by gently pulling it out of its socket. Be careful not to damage the terminals.
Note: The location and appearance of the fuel pump relay may vary slightly between different Renault Master models and years. If you are unable to find the fuel pump relay using these instructions, refer to your vehicle's owner's manual for more specific information. Additionally, it's a good idea to consult a professional mechanic or auto electrician if you are not familiar with electrical work on vehicles.