The fuel pump relay on a 2004 Honda Odyssey is typically located in the engine bay fuse/relay box near the battery; some models also place it in the interior fuse box behind the glove box, so you should check both locations if you're troubleshooting.
Engine bay: locating the FP relay
Use the fuse/relay box cover and its diagram to identify the fuel pump relay (often labeled FP, FUEL PUMP, or PUMP). If you need to verify by testing, you can swap in an identical relay from the box to confirm the fuel pump circuit is being activated.
- Open the engine bay fuse/relay box, typically found on the driver’s side near the battery or strut tower.
- Read the diagram on the inside of the lid or on the box label to locate a relay labeled FP, FUEL PUMP, or PUMP.
- Carefully remove the relay to inspect its contacts and consider swapping it with another identical relay to test the fuel pump circuit.
- If you don’t see an FP or FUEL PUMP label, consult the vehicle’s wiring diagram or service manual to confirm the exact position.
Concluding: The engine bay search often reveals the FP relay near the battery area; if not, proceed to check the interior fuse box behind the glove box where some builds place the relay.
Interior fuse box: checking behind the glove box
The interior fuse box (usually on the passenger side kick panel or behind the glove box) is another common location for the fuel pump relay on some 2004 Odysseys. The lid diagram will indicate the correct relay label.
How to identify the FP relay in the interior box
Look at the panel diagram on the fuse box cover or in the owner's manual to locate FP, FUEL PUMP, or PUMP. The relays are interchangeable with similar-sized relays, which can aid in testing.
- Open the glove box, locate the interior fuse/relay panel, and remove the cover to view the diagram.
- Find the relay labeled FP, FUEL PUMP, or PUMP and note its position.
- Carefully pull the relay and, if available, swap with an identical relay to test whether the fuel pump engages on ignition.
- If no FP label is present, reference the wiring diagram for your specific VIN/market to confirm placement.
Concluding: If the FP relay isn’t in the engine bay, the interior fuse box behind the glove box is the next likely location; always verify labels on the cover to avoid confusing relays.
What to do if the relay is faulty
Symptoms of a failing fuel pump relay include a vehicle that won’t start, intermittent starting, or the engine dying after starting. To diagnose, test the relay with a multimeter, swap with a known-good relay, and check the associated fuses and wiring for corrosion or damage. If you’re unsure, have a mechanic perform a controlled diagnostic using professional tools.
Summary
For a 2004 Honda Odyssey, the fuel pump relay is most commonly found in the engine bay fuse/relay box near the battery, but some configurations place it in the interior fuse box behind the glove box. Use the diagrams on the fuse boxes to identify FP, FUEL PUMP, or PUMP, and verify by swapping relays if needed. When in doubt, consult the owner’s manual or a service manual for your specific VIN and market.