Where is the fuel pump relay on a 1997 Mercedes Benz E320?

The fuel pump relay location on a 1997 Mercedes-Benz E320 is in the underhood fuse box (also known as the central junction box). However, it's *not* a single dedicated relay specifically labeled "fuel pump." Instead, the fuel pump is controlled indirectly through several relays and the engine control module (ECM). There isn't a simple "find this one relay" answer.

To diagnose a fuel pump issue, you'll need a wiring diagram or a Mercedes-Benz repair manual specific to that year and model. These diagrams will show you the circuits and relays involved in powering the fuel pump. A multimeter will be necessary to test the circuit for power and continuity. Jumping the relay directly is not recommended unless you have a complete understanding of the system and the potential risks involved, as it could damage other components.

Instead of trying to find a specific "fuel pump relay," focus on:

* Checking the fuses: The underhood fuse box will likely have fuses related to the fuel system. Check these first for blown fuses.

* Using a wiring diagram: This will show you the complete power path to the fuel pump, helping you troubleshoot relays and other potential issues.

* Professional diagnosis: If you're not comfortable working with automotive electrical systems, a qualified Mercedes-Benz mechanic is the safest route.

Attempting to locate and test relays without a wiring diagram can lead to frustration and potentially damage other components in the car's electrical system.