2006 Mitsubishi Eclipse Fuel Pump Location: Where It Is and How to Access It

If you own a 2006 Mitsubishi Eclipse and you're dealing with hard starting, stalling, or a whining noise from the rear of the car, the fuel pump is likely your culprit. Here is the direct answer: the fuel pump on a 2006 Mitsubishi Eclipse is located inside the fuel tank, which sits under the rear seating area of the vehicle. You do not need to drop the tank to reach it in most cases, because there is an access panel beneath the rear seat cushion that allows you to get to the pump module.

This article walks you through exactly where the pump lives, how to confirm it's the problem, what parts you'll need, and how to replace it safely. Whether you're a weekend DIYer or just trying to understand what your mechanic is talking about, this guide gives you the practical details without the fluff.

Why the Location Matters

The 2006-2012 Mitsubishi Eclipse uses an in-tank electric fuel pump module assembly. This means the pump, fuel level sender, pressure regulator, and strainer are all combined into one unit that drops into the top of the fuel tank. The tank itself is mounted beneath the rear seat, which is why you'll be working inside the cabin rather than under the car.

Knowing this location upfront saves you time. Many owners assume they need to raise the vehicle and drop the tank, but that's not the case for this generation of Eclipse. With the rear seat cushion removed, you'll see a metal access cover. Removing that cover exposes the fuel pump module and all its connections.

Signs Your Fuel Pump Is Failing

Before you tear anything apart, make sure the pump is actually the problem. These are the most common symptoms of a bad fuel pump on a 2006 Mitsubishi Eclipse:

  1. Engine cranks but won't start – The pump isn't delivering fuel to the injectors.

  2. Whining noise from the fuel tank area – A loud hum or whine when the ignition is turned on or while the engine runs often indicates a worn pump motor.

  3. Loss of power under load – The engine struggles to maintain speed, especially when accelerating or climbing hills.

  4. Hesitation or stumbling – The car feels like it's choking or sputtering during acceleration.

  5. Long cranking time – The engine takes several seconds of cranking before it fires up.

  6. Stalling that restarts after a few minutes – This classic symptom points to an overheating or failing pump.

If you're experiencing any combination of these, it's worth checking the fuel pressure and verifying that the pump itself is receiving power before you buy a replacement. A fuel pressure gauge and a quick check of the relay can save you from replacing a perfectly good pump.

What's Involved in the Fuel Pump System

The fuel delivery system on the 2006 Eclipse consists of several components you should understand:

Fuel Pump Module Assembly – This is the main unit inside the tank. It includes the electric pump, the fuel level sender (which controls your gas gauge), the pressure regulator, and the strainer that filters debris before fuel enters the pump.

Fuel Pump Relay – There are two relays for the fuel pump on this vehicle. They're located in the fuse box on the driver's side, under the dash. Some sources mention the relay being behind the carpet on the passenger side footwell near the center console. If your pump isn't getting power, a faulty relay is often the culprit.

Fuel Filter – On the 2006 Eclipse, the fuel filter is considered part of the fuel pump assembly inside the tank. This means when you replace the pump module, the filter is replaced at the same time.

Fuel Pressure Regulator – The regulator is integrated into the pump module and maintains the correct system pressure (around 44 psi for this vehicle). If this fails, you'll experience many of the same symptoms as a bad pump.

How to Access the Fuel Pump on a 2006 Eclipse

Here's the step-by-step process for reaching the fuel pump. Take your time and work safely.

Step 1: Disconnect the battery. Always disconnect the negative battery cable before working on any fuel system component. This prevents accidental sparks.

Step 2: Relieve fuel system pressure. Remove the fuel pump fuse or relay, then start the engine and let it run until it stalls. Crank it a few more times to make sure all pressure is gone. Alternatively, you can remove the fuel cap to release tank pressure.

Step 3: Remove the rear seat cushion. The rear seat bottom simply pulls up and out. It's held in place by clips. Firmly pull up on the front edge of the cushion, and it should release.

Step 4: Locate the access cover. Once the seat is removed, you'll see a metal or plastic cover plate on the floor pan. This is the access point to the fuel tank and pump module.

Step 5: Remove the cover plate. Use a screwdriver or socket to remove the screws or bolts holding the cover in place. Set it aside.

Step 6: Disconnect the electrical connectors and fuel lines. You'll see the wiring harness connected to the top of the pump module, along with fuel lines. Mark or photograph everything before disconnecting so you know how to put it back together.

Step 7: Remove the locking ring. The pump module is secured by a large locking ring. Use a hammer and a blunt punch or a specialized fuel pump wrench to rotate the ring counterclockwise. Once loose, lift the ring off.

Step 8: Carefully lift out the old pump module. The module includes the float arm and fuel level sender. Be gentle to avoid bending the float arm. Note the orientation of the module before removing it completely.

Step 9: Install the new pump module. Transfer any components that aren't included with your new unit (like the seal). Position the new module the same way the old one was oriented, then press it into the tank.

Step 10: Reinstall the locking ring, lines, and connectors. Tighten the locking ring clockwise, reconnect the fuel lines and electrical connectors, replace the access cover, and reinstall the seat.

Choosing the Right Replacement Fuel Pump

Not all fuel pumps are created equal, and choosing the wrong one can lead to poor performance or premature failure. Here's what to look for.

Check your engine size. The 2006 Eclipse came with either a 2.4L four-cylinder or a 3.8L V6. While the pump module is similar, you need to verify the correct part for your specific engine to ensure proper fit and fuel delivery.

Look for a complete module. A full fuel pump module assembly includes the pump, fuel level sender, regulator, strainer, and often the seal. This simplifies installation and ensures all components work together. Some aftermarket options only include the bare pump, which means you'll need to reuse parts from your old assembly.

Consider the brand. Delphi is a well-known OEM supplier for Mitsubishi fuel system components. Their FG1265 module is a direct replacement for 2006-2012 Eclipse models with the 2.4L engine and also fits the 2007-2009 Galant. A-Premium also offers a compatible assembly for the 2006-2012 Eclipse with the sending unit included. For the 3.8L V6, Autopart Premium makes a direct replacement assembly.

Verify the connector and outlet type. The fuel pump module uses a five-terminal blade connector and a quick-connect outlet. Make sure your replacement matches these specifications to avoid wiring headaches.

Check the warranty. A good fuel pump should come with a solid warranty. Some brands offer three-year warranties on their fuel pump replacements.

Recommended: KEMSO Fuel Pump for Your Mitsubishi Eclipse

When it's time to replace the fuel pump on your 2006 Mitsubishi Eclipse, you want a part that performs like the original, installs without hassle, and lasts. KEMSO fuel pumps deliver exactly that.

KEMSO specializes in high-performance fuel pumps that are designed as OEM replacements. This means they're built to match or exceed the original equipment specifications for fit, form, and function. You don't have to worry about modifications, adapters, or compatibility issues — the pump goes in the way the factory part did.

Every KEMSO fuel pump comes with a lifetime warranty. That's peace of mind that you won't get with many other aftermarket brands. If the pump ever fails due to a manufacturing defect, KEMSO stands behind it.

KEMSO offers a wide range of fuel pumps for cars, motorcycles, ATVs, and watercraft, all built with the same commitment to quality and durability. Their catalog includes options for many popular makes and models, so whether you're working on an Eclipse or another vehicle, KEMSO likely has a solution.

Visit the KEMSO website today to browse their selection and find the right fuel pump for your 2006 Mitsubishi Eclipse: https://www.kemsoracing.com/

Fuel Pump Replacement Cost Considerations

Replacing a fuel pump isn't just about the part — labor costs can add up quickly. Here's what to expect.

Parts cost. A fuel pump module assembly for the 2006 Eclipse generally runs between $90 and $360 depending on the brand and whether it's a complete module or just the pump. Complete assemblies that include the sending unit and regulator tend to cost more but save you labor time.

Labor cost. If you have a mechanic do the work, expect to pay significantly more. The average national cost for a fuel pump replacement across all vehicles is roughly $611 to $894, including parts and labor. The Eclipse is relatively accessible through the rear seat, which can reduce labor time compared to vehicles that require dropping the fuel tank.

DIY savings. If you're comfortable working on your car, doing it yourself saves most of the labor cost. The job is straightforward for a DIYer with basic hand tools. Just allow yourself a couple of hours and work carefully.

Don't forget the seal. The O-ring or gasket that seals the pump module to the tank should be replaced whenever you swap the pump. Many complete modules include this seal, but if yours doesn't, order one separately. A faulty seal will cause fuel odors and potential leaks.

Prevention Tips to Extend Fuel Pump Life

A fuel pump doesn't fail without reason. These habits will help your replacement pump last as long as possible.

  1. Keep your fuel tank at least a quarter full. Running low frequently causes the pump to overheat because the fuel acts as a coolant. A consistently low tank also allows debris to get sucked into the pump.

  2. Replace your fuel filter on schedule. On the 2006 Eclipse, the filter is part of the pump module, so it's replaced with the pump. On vehicles with a separate filter, replacing it regularly prevents strain on the pump.

  3. Use quality fuel. Cheap or contaminated fuel can clog the strainer and damage the pump. Stick to reputable gas stations.

  4. Clean the fuel tank before installing a new pump. Fuel tank contamination is the leading cause of premature fuel pump failure. If the tank has rust, dirt, or debris, clean it thoroughly before dropping in a new module. Delphi recommends using a fuel tank cleaning kit before installation.

  5. Listen for warning signs. If you hear a whine from the fuel tank area, address it early. A pump that's struggling today will likely fail completely tomorrow.

Common Questions About the 2006 Eclipse Fuel Pump

Do I need to drop the fuel tank to replace the pump? No. The pump is accessible through an access panel under the rear seat. Dropping the tank is only necessary if you're replacing the tank itself.

Where exactly is the fuel pump relay? The fuel pump relay is located in the fuse box under the driver's side dash. Some sources also point to a relay behind the carpet on the passenger side footwell. If your pump isn't working at all, check the relay before condemning the pump.

What fuel pressure should the system have? The 2006 Eclipse fuel system operates at approximately 44 psi with a maximum pressure rating of 80 psi.

Will a fuel pump from a Galant fit my Eclipse? Yes, in many cases. The Delphi FG1265 fits both the 2006-2012 Eclipse and the 2007-2009 Galant. Other Mitsubishi models from the same era may also share compatible pumps, but always verify fitment before purchasing.

How long does a replacement take? Most DIYers can complete the job in 1.5 to 3 hours. A professional should be able to do it in about 2 hours.

Final Thoughts

The 2006 Mitsubishi Eclipse fuel pump is tucked inside the fuel tank beneath the rear seat, and reaching it is easier than you might think. With a few basic tools, a replacement pump module, and about two hours of your time, you can have your Eclipse running like new again.

If you're not confident doing this yourself, the information in this guide at least helps you understand what's involved and what questions to ask your mechanic. Either way, don't drive around with a failing fuel pump — the symptoms only get worse, and you risk being stranded.

When you're ready to buy a replacement, check out KEMSO's high-performance, OEM-replacement fuel pumps with lifetime warranty coverage. Visit https://www.kemsoracing.com/ to find the right part for your 2006 Mitsubishi Eclipse and get back on the road with confidence.


Back to blog