* Under the hood in the Power Distribution Box (PDB): This is the most common location. The PDB is usually a large black box, often located near the battery. The relay itself might be labeled, or you'll need to consult your owner's manual or a wiring diagram to identify it.
* Inside the passenger compartment fuse box: Less common, but possible. This fuse box is typically located under the dashboard on the driver's side. Again, you'll need your owner's manual or a wiring diagram to pinpoint the correct relay.
To find it definitively:
1. Consult your owner's manual: This is the best resource. It will have a diagram showing the location of all fuses and relays.
2. Use a wiring diagram: A wiring diagram specific to your 2004 Ford Focus will show the exact location and color coding of the fuel pump relay. These can often be found online through automotive repair websites.
3. Search online forums: Forums dedicated to Ford Focus owners often have discussions about locating specific components, and you might find someone who has already shared photos or detailed instructions.
Important Note: Before working on any electrical components, disconnect the negative terminal of your battery to prevent accidental shorts or damage.