2001 Mitsubishi Eclipse Fuel Pump: The Complete Guide to Replacement, Diagnosis, and Cost

The bottom line: If you own a 2001 Mitsubishi Eclipse and your fuel pump has failed, the replacement is a straightforward but involved job. The fuel pump sits inside the fuel tank, and you will need to drop the tank or cut an access panel to reach it. Expect to pay between $350 and $700 for a professional replacement, depending on whether you choose OEM or aftermarket parts. The most common part numbers for the 2001 Eclipse include MR508282 (OEM) and the FG1223 assembly for the 2.4L engine. This guide walks you through everything you need to know.

How to Tell If Your 2001 Eclipse Fuel Pump Is Failing

Before you start buying parts, you need to be sure the fuel pump is actually the problem. A failing fuel pump on a 2001 Mitsubishi Eclipse shows clear symptoms.

1. Engine Sputters at High Speeds. If your car runs fine at low speeds but starts to sputter or lose power when you accelerate on the highway, the fuel pump may not be delivering enough pressure.

2. Difficulty Starting. A weak fuel pump cannot build enough pressure in the fuel rail. You may need to crank the engine several times before it fires up.

3. Whining Noise from the Fuel Tank. A healthy fuel pump makes a low hum. If you hear a loud, high-pitched whine coming from the rear of the car (near the fuel tank), the pump is struggling.

4. Engine Stalls and Won't Restart. This is the most common symptom of a completely failed pump. The engine will die suddenly, and no amount of cranking will bring it back.

5. Check Engine Light. The ECU will often trigger a code related to fuel pressure or mixture. Common codes include P0087 (Fuel Rail/System Pressure Too Low) or P0230 (Fuel Pump Primary Circuit Malfunction).

Which Fuel Pump Fits the 2001 Mitsubishi Eclipse?

The 2001 Mitsubishi Eclipse came with two engine options: a 2.4L inline-4 (engine code 4G64) and a 3.0L V6 (engine code 6G72). The fuel pump assembly is different for each engine, but many aftermarket parts cover both.

OEM Part Number: The factory Mitsubishi fuel pump assembly is part number MR508282. This is the direct replacement part from the dealer.

Aftermarket Compatibility: The 2001 Eclipse shares its fuel pump platform with several other Mitsubishi and Chrysler vehicles. The following models use the same pump assembly:

  • 2000-2005 Mitsubishi Eclipse (2.4L and 3.0L)
  • 2000-2003 Mitsubishi Galant (2.4L)
  • 2002-2005 Chrysler Sebring (2.4L and 3.0L)
  • 2002-2005 Dodge Stratus (2.4L)

Common Aftermarket Assemblies:

  • FG1223 – This is the most popular replacement assembly. It is an electric fuel pump module that includes the pump, sending unit, and strainer.
  • Autopart Premium 7161-02551159 – Another direct-fit assembly for the 2000-2001 models.
  • Carquest Electrical Fuel Pump – Fits 2000-2001 Eclipse and 1999-2000 Galant models.

Make sure you order the correct part for your engine size. The 2.4L and 3.0L pumps are not interchangeable without modifying the wiring harness.

Step-by-Step: How to Replace the 2001 Mitsubishi Eclipse Fuel Pump

Replacing the fuel pump on a 2001 Eclipse is a job you can do in your driveway, but it will take a few hours. Here is how to do it safely.

What You Will Need:

  • New fuel pump assembly (OEM or aftermarket)
  • Jack and jack stands (preferably two sets)
  • Ratchet set with extensions
  • Flathead screwdriver
  • Safety glasses and gloves
  • Fire extinguisher (keep it nearby)
  • Fuel line disconnect tool (if your fuel lines use quick-connect fittings)

Step 1: Relieve Fuel System Pressure.
Remove the fuel pump relay or fuse from the fuse box. Start the engine and let it run until it stalls. Crank the engine two more times to ensure all pressure is gone. Disconnect the negative battery cable.

Step 2: Remove the Rear Seat.
The fuel pump is located under the rear seat on the passenger side. Lift the rear seat cushion. You will see a metal access cover. Remove the screws or bolts holding it down.

Step 3: Access the Fuel Pump.
If you have a 2001 Eclipse with the factory access panel, you are in luck. Remove the cover. If there is no panel, you will need to cut one using a sheet metal nibbler or saw. Professionals recommend cutting a 6x6-inch opening directly above the pump location.

Step 4: Disconnect the Fuel Lines and Wiring.
Use a fuel line disconnect tool to separate the lines from the pump assembly. Have a rag ready; some fuel will spill. Unplug the electrical connector for the pump and the fuel level sending unit.

Step 5: Remove the Old Pump.
Use a hammer and a brass punch or a specialized fuel pump removal tool to loosen the locking ring. Turn it counterclockwise. Lift the pump assembly out of the tank. Be careful not to bend the float arm on the sending unit.

Step 6: Install the New Pump.
Transfer the rubber gasket from the old pump to the new one. Drop the new pump assembly into the tank. Make sure the float arm is oriented correctly. Tighten the locking ring clockwise until it is snug.

Step 7: Reconnect Everything.
Reconnect the fuel lines and wiring. Replace the access cover (or seal your new access panel). Reinstall the rear seat. Reconnect the battery and reinstall the fuel pump relay.

Step 8: Test the System.
Turn the ignition key to the "ON" position (do not start the engine). You should hear the fuel pump prime for 2-3 seconds. Start the engine and check for leaks.

How Much Does a 2001 Mitsubishi Eclipse Fuel Pump Replacement Cost?

Parts Cost:

  • OEM Fuel Pump Assembly (MR508282): $180 to $280
  • Aftermarket Assembly (FG1223): $60 to $120
  • Fuel Pump Only (no sending unit): $40 to $80

Labor Cost:

  • Professional mechanic: $200 to $400 (typically 2-3 hours of labor)
  • Dealership: $300 to $500 (higher hourly rate)

Total Estimated Cost:

  • DIY with aftermarket parts: $80 to $150
  • Professional with aftermarket parts: $350 to $550
  • Professional with OEM parts: $500 to $700

Cost Factors:
The biggest factor is whether the shop has to drop the fuel tank. If your Eclipse does not have an access panel under the rear seat, the mechanic will have to drop the tank, which adds time and labor cost. Some shops charge extra for cutting an access panel.

Pro Tips for a Successful Replacement

1. Always Replace the Fuel Filter Too.
A clogged fuel filter can kill a new pump just as fast as an old one. The fuel filter on the 2001 Eclipse is located along the frame rail near the passenger side rear wheel. Replace it at the same time.

2. Check the Fuel Pump Relay.
Before you pull the pump, test the relay. A bad relay can mimic a dead pump. Swap the fuel pump relay with the horn relay (same part number) and see if the pump works.

3. Use a Fuel Pump Access Panel.
If your car does not have one, cut one. It saves you from having to drop the tank every time the pump fails. Many owners report that the 2001 Eclipse does not have a factory access panel, while some later models do. If yours is missing, this is the time to add one.

4. Watch for Rust.
The fuel pump assembly is held in by a locking ring that can rust. If the ring is rusted, spray it with penetrating oil and let it sit for 15 minutes before trying to turn it.

5. Keep the Tank Clean.
When you remove the old pump, look inside the tank. If you see dirt, rust, or debris, you need to clean the tank out. You can use a shop vac to remove loose debris, but for heavy rust, consider replacing the tank.

Common Problems Specific to the 2001 Eclipse Fuel System

1. Fuel Sending Unit Failure.
Many owners report that the fuel level gauge stops working even when the pump is fine. This is a common issue with the 2001 Eclipse. The fuel pump assembly includes the sending unit, so replacing the entire assembly fixes both problems.

2. Fuel Pump Connector Meltdown.
The electrical connector on the top of the fuel pump assembly can overheat and melt. This is a known issue on the 3G Eclipse (2000-2005). When you replace the pump, inspect the connector. If it is melted, you must replace the wiring harness pigtail as well.

3. Clogged Fuel Strainer.
The strainer (sock) at the bottom of the pump can get clogged with debris, especially if the car has been run low on fuel frequently. Always replace the strainer with the pump.

Why Fuel Pump Maintenance Matters for Your 2001 Eclipse

Your fuel pump is the heart of your engine's fuel system. It draws fuel from the tank and pushes it through the fuel lines, filter, and injectors at the correct pressure. A failing pump can cause lean fuel mixtures, which leads to overheating and engine damage.

Running the tank low on fuel is the #1 cause of fuel pump failure. The fuel in the tank helps cool the pump. When the level is low, the pump runs hotter and wears out faster. Keep your tank at least one-quarter full to extend pump life.

KEMSO Fuel Pump: The Best Replacement for Your 2001 Mitsubishi Eclipse

When it comes time to replace the fuel pump on your 2001 Mitsubishi Eclipse, you want a part that delivers reliable performance without breaking the bank. KEMSO Fuel Pumps are an excellent choice for Eclipse owners who want high-quality, OEM replacement performance at a fair price.

Why Choose KEMSO?

  • High Performance. KEMSO fuel pumps are engineered to meet or exceed OEM specifications. They deliver the exact flow rate and pressure your 2001 Eclipse engine needs, whether you have the 2.4L or 3.0L engine.
  • OEM Replacement Fit. Every KEMSO pump is designed as a direct, drop-in replacement. No modifications, no adapters, no wiring changes. It fits perfectly into your fuel tank assembly.
  • Lifetime Warranty. KEMSO stands behind its products. Every fuel pump comes with a lifetime warranty, giving you peace of mind that your investment is protected.

KEMSO is a trusted name in the automotive aftermarket, known for producing durable fuel pumps for cars, motorcycles, ATVs, and more. They use high-quality materials and rigorous testing to ensure every pump performs reliably for years.

Visit KEMSO Racing today to find the right fuel pump for your 2001 Mitsubishi Eclipse: https://www.kemsoracing.com/

Final Thoughts on the 2001 Mitsubishi Eclipse Fuel Pump

Replacing the fuel pump on your 2001 Eclipse is not a difficult job, but it does require patience and the right tools. The most important thing is to confirm the diagnosis before you start. A bad fuel pump relay, a clogged fuel filter, or a failed fuel pressure regulator can all cause symptoms that look like a dead pump.

If you decide to do the job yourself, take your time. The fuel system is under pressure, and gasoline is highly flammable. Work in a well-ventilated area, keep a fire extinguisher nearby, and never smoke while working on the fuel system.

For the best results, pair your new fuel pump with a quality replacement fuel filter. This combination will keep your 2001 Eclipse running smoothly for years to come. And when you choose KEMSO, you get a pump that is built to last, backed by a lifetime warranty, and designed to fit your car perfectly.

For a reliable, high-performance fuel pump for your 2001 Mitsubishi Eclipse, visit KEMSO Racing at: https://www.kemsoracing.com/


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