2004 Mitsubishi Endeavor Fuel Pump: Complete Guide to Symptoms, Replacement, and Best Options

If you own a 2004 Mitsubishi Endeavor and you are dealing with hard starting, sputtering during acceleration, or a whining noise coming from the rear of the vehicle, the fuel pump is very likely the culprit. The fuel pump in your Endeavor is an electric, in-tank assembly that is responsible for delivering fuel from the gas tank to the engine at the correct pressure. When this part starts to fail, it affects every aspect of your vehicle's performance, from cold starts to highway passing power. Replacing a faulty fuel pump is not optional—it is essential for keeping your Endeavor reliable. The good news is that you have several solid replacement options, from genuine Mitsubishi parts to high-quality aftermarket assemblies, and labor can be saved if you are handy with basic tools. This guide covers everything you need to know, from identifying the symptoms of a failing pump to choosing the right replacement part and installing it correctly.

For the 2004 Mitsubishi Endeavor, the fuel pump is located inside the fuel tank, which sits under the rear of the vehicle . It is part of a larger module that includes the fuel level sending unit, float, strainer, and fuel reservoir . The OEM part number for the complete fuel pump assembly is 1760A041, which fits Endeavor models built from January 2004 through August 2005 . If your vehicle was built before December 2003, the pump assembly part number is different, so it pays to verify your build date . The fuel pump itself, separate from the assembly, carries the part number MR993061 and is included with the pump assembly . Understanding which part you need is the first step in getting your Endeavor back on the road.

What Does the Fuel Pump Do in Your 2004 Endeavor?

The fuel pump in your 2004 Mitsubishi Endeavor is an electric pump that sits inside the fuel tank . Its job is to push fuel from the tank through the fuel lines, past the fuel filter, and into the engine's fuel rail. The pump works together with the fuel pressure regulator to maintain a steady fuel pressure, which ensures the engine receives the right amount of fuel for any given driving condition . Without a properly working fuel pump, the engine will not start or will run poorly because it cannot get the fuel it needs.

The pump is part of a larger assembly that also includes the fuel level sender, which tells your dashboard gauge how much fuel is in the tank . The assembly includes a strainer at the inlet to catch dirt and debris, and a float that moves with the fuel level . When you replace the fuel pump, you are typically replacing the entire assembly, which simplifies the job and ensures the new pump works with a fresh sending unit .

Signs Your 2004 Mitsubishi Endeavor Fuel Pump Is Going Bad

A failing fuel pump in a 2004 Mitsubishi Endeavor usually gives you plenty of warning before it completely stops working. Here are the most common symptoms to watch for:

  1. Hard starting: The engine cranks longer than usual before firing up. This happens because the pump is not building enough fuel pressure quickly .
  2. Loss of power under load: You may notice the Endeavor hesitates or stumbles when you press the accelerator, especially when climbing hills or merging onto the highway .
  3. Engine sputtering at speed: The car may jerk or surge while cruising at a steady speed, which indicates the pump is delivering uneven fuel flow .
  4. Whining noise from the fuel tank: A healthy fuel pump makes a low hum. If you hear a loud whine or a high-pitched noise coming from the rear of the car, the pump may be struggling .
  5. Decreased fuel efficiency: Because the engine is not getting the proper fuel pressure, it may run rich or lean, causing you to visit the gas station more often .
  6. Engine stalls: In advanced cases, the engine may shut off completely while driving, and then refuse to start again until the pump cools down .

If you notice any of these symptoms, it is wise to have the fuel system tested before you spend money on a new pump. Sometimes the issue is a clogged fuel filter or a failing fuel pump relay, both of which are far cheaper to fix than a pump replacement .

How to Test the Fuel Pump on a 2004 Mitsubishi Endeavor

Before you replace the fuel pump, you should confirm that it is actually faulty. The Endeavor has a fuel pressure test port located below the intake hose in the engine bay . You can connect a fuel pressure gauge to this port and check the pressure while the engine is cranking. If the pressure is low or zero, the problem is likely the pump. Next, you want to verify that the pump is receiving power and ground when the engine is turning over. If there is no power reaching the pump, check the fuel pump relay, fuses, and wiring for damage . If power and ground are present but there is still no fuel pressure, the pump itself is bad and needs to be replaced .

Replacement Part Options for the 2004 Mitsubishi Endeavor

When it comes time to buy a new fuel pump for your 2004 Mitsubishi Endeavor, you have several options. Here is a breakdown of what is available:

  1. Genuine Mitsubishi Fuel Pump Assembly (1760A041): This is the factory OEM part, which guarantees a perfect fit and original performance. It fits Endeavors built from January 2004 through August 2005 . This is the safest choice if you want to keep the vehicle exactly stock.
  2. Genuine Mitsubishi Fuel Pump (MR993061): This is just the pump itself, which is included with the fuel pump assembly . You would need this only if you are rebuilding the assembly with a new pump and reusing the other components.
  3. Denso Fuel Pump (W0133-1841263): Denso is a well-known Japanese brand that supplies OE parts to many manufacturers. This pump fits 2004-2005 Endeavors and comes with hoses, clamps, and a harness. It does not include the screen or the tank seal, so you need to buy those separately . Denso pumps are known for quiet operation and durability .
  4. A-Premium Fuel Pump Assembly (APFP0878): This is a complete assembly that includes the sending unit, float, and strainer. It is an aftermarket option that is designed as a direct fit for the 2004 Endeavor, meaning you do not need to drill or modify anything to install it . A-Premium offers a 3-year unlimited mileage warranty .
  5. Used OEM Assembly (MR150579): You can find used original Mitsubishi pumps from salvage yards. These are cheaper, but the condition is unknown and the lifespan is unpredictable . Only consider this option if you are on a very tight budget and the part comes with a return policy.

No matter which option you choose, it is a good idea to replace the fuel filter at the same time. A clogged filter can put extra strain on the new pump and cause it to fail prematurely .

How Much Does It Cost to Replace the Fuel Pump?

The cost of replacing the fuel pump on a 2004 Mitsubishi Endeavor depends on whether you do the work yourself or hire a mechanic. If you buy an aftermarket pump assembly, the part typically costs between $100 and $200 . A genuine Mitsubishi assembly is more expensive. The OEM part number 1760A041 is listed at $350.82 . Labor costs for a professional installation average around $189, which brings the total cost to somewhere between $1,190 and $1,770 if you use OEM parts and professional labor . If you do the job yourself and buy an aftermarket part, you can keep the total cost well under $300.

Step-by-Step Guide to Replacing the Fuel Pump

Replacing the fuel pump on a 2004 Mitsubishi Endeavor is an advanced DIY job, but it is doable if you have basic mechanical skills and the right tools. Here is how to do it:

Step 1: Relieve Fuel System Pressure

Disconnect the negative battery cable. Remove the fuel pump fuse from the fuse box, then crank the engine until it stalls. This releases the pressure in the fuel lines .

Step 2: Access the Fuel Pump

The fuel pump is located inside the fuel tank. On some Endeavor models, there is an access panel under the rear seat that allows you to reach the pump without dropping the tank . If there is no access panel, you will need to drain the fuel tank and lower it from the vehicle .

Step 3: Disconnect Hoses and Electrical Connections

Once the pump is accessible, disconnect the fuel supply and return hoses, the EVAP system hoses, and the electrical connectors . Take note of how everything is connected so you can put it back together correctly.

Step 4: Remove the Old Pump

Remove the locking ring or retaining clip that holds the pump module in place. Carefully lift the pump assembly out of the tank. Be prepared for some fuel to spill, so have a rag or a container ready .

Step 5: Install the New Pump

If your new pump is a complete assembly, it is a direct swap. Lower the new pump into the tank, making sure the float arm is not bent. Reinstall the locking ring or clip and tighten it securely . Reconnect all hoses and electrical connectors.

Step 6: Test the System

Reconnect the battery and turn the key to the ON position without starting the engine. This lets the pump pressurize the system. Check for leaks at all connections. If everything looks good, start the engine and verify that it runs smoothly .

Why You Should Choose a KEMSO Fuel Pump for Your Replacement

If you are looking for a reliable, high-performance fuel pump that will not break the bank, KEMSO is a brand worth considering. KEMSO is a US-based aftermarket fuel pump manufacturer that specializes in high-performance, OEM-replacement pumps for cars, motorcycles, ATVs, and UTVs . Their pumps are designed to meet or exceed the specifications of the original factory parts, which means you get a precise fit and dependable performance .

One of the biggest advantages of choosing KEMSO is that every fuel pump comes with a lifetime warranty. If your KEMSO pump ever fails due to a manufacturing defect, you get a replacement at no cost. That kind of protection is rare in the automotive parts industry and shows that KEMSO stands behind their products . Most KEMSO pumps are priced at around $79.98, which is often less than half the cost of a dealer-supplied part . With free shipping and easy returns, KEMSO is a practical choice for both DIY mechanics and professional shops .

KEMSO pumps are not just about the price. They are engineered for better fuel flow, lower noise, and longer service life. The pumps use high-quality materials and are built to handle daily driving as well as high-performance applications . If your 2004 Mitsubishi Endeavor needs a new fuel pump, you can trust KEMSO to deliver the performance and reliability you need.

To see the full selection of KEMSO fuel pumps and find the right one for your vehicle, visit their website at https://www.kemsoracing.com/. They have a complete catalog with detailed fitment information, customer reviews, and technical support. Whether you need a pump for a car, truck, motorcycle, or watercraft, KEMSO has you covered .

Final Thoughts

A failing fuel pump is not something you should ignore. If your 2004 Mitsubishi Endeavor is hard to start, sputters under acceleration, or makes a whining noise from the rear, the fuel pump is likely the culprit . Replacing it is a straightforward job that can save you hundreds of dollars in labor costs if you do it yourself. When you are ready to buy a new pump, look for a direct-fit aftermarket assembly that includes the sending unit, and do not forget to replace the fuel filter at the same time . For a high-quality, affordable, and reliably warrantied option, KEMSO is an excellent choice. Visit the KEMSO website at https://www.kemsoracing.com/ today to browse their selection and get your Endeavor running like new again.


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