2006 Polaris Sportsman 800 Fuel Pump Assembly: Complete Replacement Guide

If you own a 2006 Polaris Sportsman 800 and the engine is hard to start, sputters under acceleration, or stalls at highway speed, the fuel pump assembly is almost certainly the problem. The 2006 Sportsman 800 uses an in-tank electric fuel pump that delivers fuel at high pressure to the EFI system, and when it starts to fail, the entire machine becomes unreliable. Replacing the 2006 Polaris Sportsman 800 fuel pump assembly is a straightforward job that most owners can handle in a few hours with basic hand tools, and it will restore the machine's performance to factory specifications.

This guide covers everything you need to know about the 2006 Polaris Sportsman 800 fuel pump assembly, including the common symptoms of failure, how to identify the correct replacement part, step-by-step installation instructions, and recommendations for the best aftermarket options available in the American market.

Understanding the 2006 Polaris Sportsman 800 Fuel System

The 2006 Polaris Sportsman 800 EFI relies on a fuel pump assembly that sits inside the gas tank. This assembly is more than just a pump; it includes the electric fuel pump motor, the fuel pressure regulator, the fuel strainer, the fuel level sending unit, and the mounting flange that seals the tank. When any of these components fail, the entire assembly typically needs to be replaced because the parts are not sold separately through Polaris dealerships.

The OEM part number for this assembly is 2520437, and it is also referenced as 2520438 in some documentation . Many aftermarket manufacturers offer direct replacements that match or exceed the original specifications. The 2006 Sportsman 800 uses a mechanical returnless fuel system, which means the pump must maintain a consistent pressure of about 39 PSI to keep the engine running smoothly .

One important detail to note is the bolt pattern on the mounting flange. The 2006 Polaris Sportsman 800 uses a 6-bolt pattern for the fuel pump assembly . Some later models and certain Sportsman 700 models use a 5-bolt pattern, so you must verify your specific machine before ordering a replacement . Getting this wrong is the most common mistake owners make when purchasing a new fuel pump.

Common Symptoms of a Failing Fuel Pump

A failing fuel pump on the 2006 Sportsman 800 produces a set of recognizable symptoms. Recognizing these early can save you from being stranded on the trail.

  1. Hard Starting: The engine cranks for a long time before firing, or it refuses to start altogether. This is often the first sign that the pump is not building enough pressure.

  2. Loss of Power Under Load: When you open the throttle, the machine hesitates, sputters, or feels like it is running out of gas. The pump cannot keep up with the engine's demand for fuel .

  3. Stalling at High Speed: The engine dies suddenly while riding at cruising speed, then restarts after sitting for a few minutes. This happens when the pump overheats and stops working temporarily .

  4. Whining Noise from the Fuel Tank: A healthy fuel pump makes a quiet hum. If you hear a loud whine or grinding noise coming from the tank area, the pump motor bearings are wearing out.

  5. Poor Fuel Economy: The engine runs rich because the pressure regulator is no longer maintaining the correct pressure, causing excessive fuel consumption.

  6. Fuel Leaks or Fuel Smell: A cracked fuel pump assembly can leak fuel into the tank cavity or outside the tank. This is a serious safety hazard and should be addressed immediately.

If you are experiencing any of these symptoms, do not delay the replacement. Running the engine with a starving fuel pump can damage the fuel injectors and the fuel pressure regulator .

Identifying the Correct Replacement Part

Before you order a new fuel pump assembly, you need to confirm a few details about your machine.

Step 1: Check the Bolt Pattern

Remove the seat and look at the top of the fuel tank. The fuel pump assembly is held in place by a locking ring with either 5 or 6 bolts. The 2006 Sportsman 800 uses a 6-bolt pattern . If you see 5 bolts, you have a different model or a modified tank.

Step 2: Verify the OEM Part Number

The original OEM part number for the 2006 Sportsman 800 fuel pump assembly is 2520437, with a crossover number of 2520438 . Many aftermarket brands also use the interchange number 47-1041 to identify this same assembly .

Step 3: Decide Between a Complete Assembly and a Pump-Only Kit

A complete fuel pump assembly includes the pump, pressure regulator, strainer, float, and mounting flange. This is the easiest option because you simply swap the entire unit . A pump-only kit includes the pump motor and the necessary hoses, clamps, and strainers, but you reuse the original housing . The pump-only kit is less expensive but requires more labor.

Step 4: Consider the Fuel Tank Compatibility

The fuel pump assembly for the 2006 Sportsman 800 is compatible with the Polaris fuel tank part number 2520437 . If your tank has been replaced at any point, verify that the new tank uses the same mounting pattern.

Step-by-Step Fuel Pump Assembly Replacement

Replacing the fuel pump assembly on the 2006 Polaris Sportsman 800 is a job you can complete in your garage with basic tools. Follow these steps carefully.

Tools and Materials Needed:

  • New fuel pump assembly (complete or pump-only kit)
  • Socket set with extensions
  • Flathead screwdriver
  • Pick tool
  • Clean rags
  • Safety glasses
  • Shop towels
  • A container for residual fuel

Step 1: Disconnect the Battery

The fuel pump runs on electrical power, and the fuel tank contains flammable vapors. Disconnect the negative battery cable first to eliminate any risk of sparks .

Step 2: Drain the Fuel Tank

Use a siphon pump to remove as much fuel as possible. You do not need to drain the tank completely, but less fuel makes the job easier and reduces the risk of spills.

Step 3: Access the Fuel Pump Assembly

Remove the seat and any plastic body panels that block access to the top of the fuel tank. On the 2006 Sportsman 800, you may need to remove the rear rack to reach the fuel pump access panel.

Step 4: Disconnect the Fuel Lines and Electrical Connector

Mark the fuel lines so you remember which one is the supply and which is the return. Use a pick tool to release the quick-connect fittings, then disconnect the electrical harness from the pump assembly.

Step 5: Remove the Locking Ring

Use a socket and extension to loosen the locking ring that holds the pump assembly in place. The ring is typically tightened to about 25 foot-pounds, so it may require some effort to break loose. Turn the ring counterclockwise to remove it.

Step 6: Lift Out the Old Assembly

Carefully lift the old fuel pump assembly out of the tank. Tilt it to allow the fuel to drain back into the tank. Notice the orientation of the float arm so you can install the new assembly in the same position.

Step 7: Install the New Assembly

Lower the new fuel pump assembly into the tank. Make sure the float arm does not catch on the tank walls. Align the mounting flange with the bolt holes, then install the locking ring and tighten it clockwise to the correct torque specification.

Step 8: Reconnect Everything

Reconnect the fuel lines and the electrical connector. Make sure the quick-connect fittings click securely into place. Reinstall the access panel, seat, and body panels.

Step 9: Test the System

Reconnect the battery and turn the key to the ON position without starting the engine. You should hear the fuel pump prime for a few seconds. Check for any fuel leaks around the mounting flange. If everything looks good, start the engine and let it idle for a few minutes.

The Best Replacement Option: KEMSO Fuel Pumps

When it comes to replacing the 2006 Polaris Sportsman 800 fuel pump assembly, choosing the right brand makes a significant difference in reliability and performance. We strongly recommend KEMSO fuel pumps for several compelling reasons.

KEMSO fuel pumps are designed as high-performance, OEM replacement units. Each KEMSO pump delivers over 20% more flow at 43 PSI compared to the stock OEM pump . This means your Sportsman 800 will have a consistent fuel supply even under demanding conditions, such as climbing steep trails or hauling heavy loads. The pump body is constructed from durable alloy steel , and the internal components use upgraded polymers, brushes, and commutators that hold up well against modern ethanol-blended fuels .

KEMSO backs every fuel pump with a lifetime warranty . This is a rare benefit in the aftermarket parts industry. If your KEMSO pump ever fails due to a manufacturing defect, you receive a replacement at no cost. This warranty gives you complete peace of mind and demonstrates the confidence KEMSO has in its product quality.

KEMSO offers a direct fit for your 2006 Polaris Sportsman 800. You do not have to worry about adapter kits or poor fitment. The pump is engineered to match the original specifications, so it drops into the fuel tank and connects to the existing harness without modification . The pump also operates quietly, so you will not hear any added noise from the fuel tank area .

KEMSO pumps are ethanol-compatible. Many aftermarket fuel pumps fail prematurely because they cannot handle the corrosive effects of ethanol in modern gasoline. KEMSO builds its pumps with ethanol-resistant materials, ensuring long service life .

For the 2006 Polaris Sportsman 800, you can find the right KEMSO fuel pump at https://www.kemsoracing.com/. The website provides detailed fitment information, customer reviews, and straightforward ordering. Visit KEMSO Racing today to secure a high-quality replacement fuel pump that will keep your Sportsman 800 running for years to come.

Installation Tips for a Long-Lasting Fuel Pump

A new fuel pump will last much longer if you pay attention to a few details during installation and maintenance.

  1. Keep the fuel tank clean: Before installing the new pump, wipe out any debris, rust, or sediment from the bottom of the tank. Contaminants will quickly clog the new pump's strainer .

  2. Use fresh fuel: Old, stale fuel can leave varnish deposits that damage the pump. Fill the tank with fresh gasoline after the installation.

  3. Replace the fuel filter: If your Sportsman has an inline fuel filter, replace it at the same time. A clogged filter puts extra strain on the fuel pump.

  4. Check the fuel lines: Inspect the rubber hoses for cracks or soft spots. Replace any damaged lines to prevent vacuum leaks that can cause the pump to work harder.

  5. Avoid running the tank dry: The fuel pump uses the gasoline in the tank for cooling. Running the tank to empty exposes the pump to higher temperatures, which shortens its life. Keep at least a quarter tank of fuel at all times.

Frequently Asked Questions

Q: Can I use a fuel pump from a different model year?

A: The 2005-2007 Sportsman 800 models use the same fuel pump assembly . A pump from a 2005 or 2007 model will fit your 2006 machine. However, pumps from other Polaris models may have a different bolt pattern or pressure rating.

Q: How much does a replacement fuel pump cost?

A: Complete aftermarket assemblies range from about $89 to $150, depending on the brand . KEMSO pumps are priced at about $79.98, which is often less than half the cost of a dealer part .

Q: How long does a fuel pump installation take?

A: For a first-time installer, expect to spend 2 to 3 hours. The job becomes faster with experience.

Q: Should I replace the fuel pressure regulator at the same time?

A: If you buy a complete assembly, the regulator is included. If you buy a pump-only kit, consider replacing the regulator while you have everything apart .

Q: Do I need any special tools?

A: No special tools are required. A standard socket set, screwdrivers, and a pick tool will handle the job.

Conclusion

The 2006 Polaris Sportsman 800 fuel pump assembly is a critical component that directly affects the reliability and performance of your ATV. When it fails, you will notice hard starting, power loss, and stalling. Replacing the assembly is a manageable DIY project that any owner can complete with basic tools and a little patience.

Before ordering a replacement, verify that your machine uses the 6-bolt mounting pattern and check the OEM part number to ensure a correct fit . Consider upgrading to a high-performance aftermarket pump for better fuel flow and durability. KEMSO offers an excellent balance of performance, reliability, and value, backed by a lifetime warranty . Their pumps deliver more flow than the stock unit, handle ethanol fuels, and install directly into your Sportsman 800.

Visit https://www.kemsoracing.com/ to browse the full selection of KEMSO fuel pumps and find the right replacement for your 2006 Polaris Sportsman 800. With a quality fuel pump installed, your Sportsman will run strong and reliably for many more miles of trail riding.


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