Where is the fuel pump relay on a 2004 Ford Excursion v10?
The fuel pump relay for a 2004 Ford Excursion with the V10 sits in the engine bay’s under-hood fuse/relay box (the Power Distribution Center), and it is labeled FUEL PUMP RELAY.
In the Excursion, the relay is mounted inside the large black plastic Power Distribution Center located in the engine compartment on the passenger side near the firewall. The box lid or a diagram inside the box will mark the exact position of the FUEL PUMP RELAY, making it identifiable without pulling multiple components.
Location and labeling
To locate the relay quickly, start with the under-hood fuse/relay box. This is the large black plastic box mounted in the engine bay on the passenger side near the firewall. Open the lid and refer to the diagram printed on the inside of the lid or on the box itself to find the FUEL PUMP RELAY position. If you’re replacing, note its exact slot so you can re-seat a new unit correctly.
Use the steps below to locate the FUEL PUMP RELAY quickly inside the under-hood fuse/relay box.
- Open the hood and locate the large under-hood fuse/relay box (Power Distribution Center) on the passenger side of the engine bay near the firewall.
- Remove the lid and read the diagram printed on the inside of the lid or on the box to identify the FUEL PUMP RELAY position.
- Look for a standard 5-pin automotive relay in that position, typically labeled FUEL PUMP RELAY or with a fuel pump icon.
- Pull the relay straight out to inspect or replace it with an identical relay if needed.
Following these steps will help you locate and identify the fuel pump relay quickly. If the diagram doesn’t match your vehicle or if the box is missing labels, consult the owner’s manual or a service manual for the exact relay layout for your build date.
Testing and replacement tips
If the engine cranks but the fuel pump does not prime, testing the relay is a quick way to determine whether the issue lies with the relay, the wiring, or the pump itself. Use the steps below to test and replace as needed.
- Turn the ignition OFF and disconnect the negative battery cable to prevent short circuits.
- Inspect the FUEL PUMP RELAY slot for corrosion or a loose connection; reseat the relay firmly.
- Check the corresponding fuse for the fuel pump in the same Power Distribution Center; if the fuse is blown, replace it with the same amperage rating.
- Swap the FUEL PUMP RELAY with another identical 5-pin relay in the box (for example, the A/C or horn relay) to see if the pump behavior changes. If the swapped relay makes the pump work, the original relay is faulty.
- If swapping doesn’t help, test the circuit more directly: with key ON, verify there is 12V at the fuel pump connector (in the fuel line harness near the tank) and check for proper grounding. If there’s no voltage at the pump, the issue may be wiring, a PCM control signal, or the relay coil not energizing.
After performing these tests, if the relay tests good but the pump still doesn’t run, the fault is likely in the fuel pump, wiring to the pump, or the control circuit. If you’re unsure, seek professional diagnostics to avoid fuel-system hazards.
Summary
On a 2004 Ford Excursion V10, the fuel pump relay is located in the engine bay’s Power Distribution Center (under-hood fuse/relay box) on the passenger side near the firewall and is labeled FUEL PUMP RELAY. Access the box, identify the relay via the lid diagram, and replace or test as needed using careful safety steps. If problems persist after basic checks, broader fuel-system diagnostics may be required.
