2006 Mitsubishi Eclipse Fuel Pump Relay Location: A Direct Answer and Complete Troubleshooting Guide
Where the Fuel Pump Relay Is Located
The fuel pump relay for the 2006 Eclipse is not under the hood like many other vehicles. Instead, Mitsubishi placed it inside the cabin for protection against heat and moisture. To access it, you need to remove the trim panel on the passenger side of the center console.
Step-by-step access procedure:
- Open the passenger door and look at the side of the center console, near the floor.
- Gently pry off the plastic trim cover that runs along the lower edge of the console. A trim removal tool works best to avoid scratching the panels.
- Pull back the carpet or sound deadening material that sits behind the trim. The relay is tucked behind this carpet layer .
- Look for a small rectangular relay module. It is typically gray or black and clips into a bracket. The fuel pump relay and the MFI (Multi-Port Fuel Injection) relay are attached together as one unit .
Some sources also mention that the relay module is located on the driver side of the console, again below the radio area and mounted behind the carpet . This discrepancy may be due to different trim levels or model variations within the 2006 model year. If you do not find the relay on the passenger side, check the driver side in the same relative position.
Symptoms of a Bad Fuel Pump Relay
A failing fuel pump relay can cause several noticeable issues. Knowing these symptoms helps you confirm whether the relay is your problem before you start taking things apart .
- The engine cranks but will not start. This is the most common symptom. The starter motor turns the engine over, but there is no fuel pressure because the pump is not receiving power .
- The engine stalls while driving. If the relay cuts power to the fuel pump while the vehicle is in motion, the engine will die suddenly. In some cases, the car may restart after a short wait, but this usually means the relay is failing intermittently .
- Loss of power during acceleration. The engine may hesitate or feel weak because the fuel pump is not delivering enough pressure to meet demand .
- No noise from the fuel pump. When you turn the ignition key to the "ON" position, you should hear a low hum or whine coming from the rear of the vehicle for about two seconds. This is the fuel pump priming. If you hear nothing, the relay is a likely culprit .
How the Fuel Pump Relay Works
Understanding the relay's function helps you diagnose it effectively. The fuel pump relay is an electrically controlled switch that allows a small control signal to safely switch the higher current required by the fuel pump .
When you turn the ignition key, the engine control unit sends a low-current signal to the relay coil. This creates a magnetic field that closes the internal contacts, allowing battery power to flow to the fuel pump. The pump then builds pressure so the engine can start .
Once the engine is running, the relay stays energized to keep the pump powered. When you shut off the ignition, the relay opens and cuts power to the pump. If a fault is detected, the relay also shuts off the fuel supply for safety reasons .
There are two fuel pump relays in some Eclipse models . One is the main relay that controls pump operation during normal driving, and the other may serve as a backup or serve a different function. Both are located in the same general area behind the console carpet.
How to Test the Fuel Pump Relay
Before replacing the relay, it is worth testing it with a multimeter. This saves you money if the relay is still functional and guides you toward other potential causes .
Tools you will need:
- A digital multimeter set to the ohms setting
- A wire brush or electrical contact cleaner
- Jumper wires with alligator clips
- A 12-volt power source, such as the vehicle battery
Testing procedure:
- Turn off the vehicle and remove the key from the ignition .
- Remove the relay from its bracket by pulling it straight out. Grab it firmly on both sides and rock it gently if it resists .
- Clean the prongs with a wire brush to remove any corrosion or rust. This alone can fix a loose connection .
- Read the circuit diagram printed on the relay body. Look for the two pins that control the coil, usually labeled 85 and 86. The power pins you will test are typically labeled 87 and 30 .
- Set your multimeter to the ohm setting and choose the lowest range available .
- Attach jumper wires from the battery terminals to the coil pins (85 and 86). This energizes the relay and closes the internal switch .
- Touch the multimeter probes to the power pins (87 and 30). A working relay will show near-zero resistance. An open circuit or very high resistance indicates a faulty relay .
If the relay passes the resistance test, the problem likely lies elsewhere in the fuel delivery system. If it fails, replacement is the most straightforward fix.
Related Components to Check
If the relay tests fine but your Eclipse still will not start, several related components can cause identical symptoms.
Check these parts in order:
- Fuse 24 in the underhood fuse box. This fuse supplies power to the fuel pump circuit. A blown fuse will cut power to the pump entirely. Confirm the fuse is not only intact but also receiving voltage from its fusible link .
- The MFI relay. This relay is attached directly to the fuel pump relay as a paired unit. A failed MFI relay can interrupt power to the engine control unit, which in turn prevents the fuel pump from activating .
- The crankshaft position sensor. If this sensor fails, the engine control unit receives no RPM signal. Without this signal, the ECU will not energize the fuel pump relay or fire the injectors. You will have no spark, no fuel, and no injector pulse .
- The fuel pump module itself. Located inside the fuel tank, the module includes the pump, the fuel level sensor, and the fuel tank temperature sensor. If the pump motor is burned out, replacing the relay will not help .
The wiring diagram for the 2006 Eclipse shows that the fuel pump relay connects to the fuel pump module through several connectors (C-203, C-208, C-215) and ground points (G8, G16) . Checking these connections for corrosion or damage is another good diagnostic step.
Replacing the Fuel Pump Relay
Replacing a faulty relay is a simple job that most owners can do in under fifteen minutes.
- Purchase a replacement relay. You can buy one from an auto parts store or directly from a Mitsubishi dealer. The part number is printed on the relay body. Bring the old relay with you to ensure you get the correct match .
- Disconnect the battery negative terminal. This prevents any accidental shorts while you work .
- Remove the old relay by pulling it straight out of its bracket. Note how it is oriented so the new one goes in the same way.
- Install the new relay by pushing it firmly into the bracket until it clicks into place.
- Reconnect the battery and test the system. Turn the ignition to "ON" and listen for the fuel pump priming noise from the rear of the car.
If the new relay does not solve the problem, do not assume the relay was the wrong diagnosis. Work through the related components listed above to isolate the actual cause .
When to Consider a New Fuel Pump
The fuel pump relay is only one part of the fuel delivery system. If the relay works and power is reaching the pump, the pump itself may be failing. A fuel pump that is worn out will struggle to build adequate pressure, even with full voltage supplied .
Signs that the pump itself is failing include a whining noise that gets louder over time, hard starting when the fuel tank is low, and intermittent stalling that gets worse with heat. If you confirm power at the pump connector but the pump does not run, replacement is necessary .
Recommended Replacement: KEMSO Fuel Pump
When it comes time to replace the fuel pump itself, choosing a dependable brand makes all the difference. KEMSO offers high-performance fuel pumps that are built as OEM replacements, meaning they match the original factory specifications for fit, flow rate, and durability. Every KEMSO pump comes with a lifetime warranty, giving you peace of mind that your investment is protected for as long as you own the vehicle.
KEMSO fuel pumps are designed for a wide range of vehicles, from daily drivers to performance machines, and they are tested to meet or exceed original equipment standards. If you are looking for a reliable replacement for your Mitsubishi Eclipse, or any other vehicle in your garage, visit the KEMSO website to browse their full lineup.
You can explore their product range and find the right fuel pump for your needs at: https://www.kemsoracing.com/
Preventive Tips to Avoid Future Relay Problems
Fuel pump relays fail over time due to heat, vibration, and normal electrical wear. While you cannot prevent all failures, a few habits can extend the life of your relay and the rest of your fuel system.
- Keep the interior dry. Moisture in the passenger footwell can corrode relay contacts. Check for leaking seals around the doors and windshield.
- Avoid letting the fuel tank run empty. Running low on fuel causes the pump to run hotter and can pull debris into the system, which increases the load on the relay.
- Clean the relay contacts during routine maintenance. A quick spray of electrical contact cleaner on the prongs every couple of years helps maintain a solid connection.
- Replace the relay proactively. If your Eclipse is approaching 15 years old or more, replacing the fuel pump relay as a preventative measure is inexpensive insurance against getting stranded.
Final Thoughts
The 2006 Mitsubishi Eclipse fuel pump relay location is straightforward once you know where to look. The passenger side footwell, behind the center console carpet, is the primary location . If you do not find it there, check the driver side in the same spot .
Testing the relay with a multimeter is quick and saves you from replacing parts unnecessarily. If the relay is bad, replacing it is a simple task. If the relay is good, move on to checking the fuse, the MFI relay, the crankshaft sensor, and finally the pump itself .
When the pump is the culprit, KEMSO provides a high-performance, OEM-replacement option with a lifetime warranty. Their products are built to deliver reliable fuel delivery for years to come. Visit https://www.kemsoracing.com/ to find the right pump for your Eclipse or any other vehicle in your driveway .