2006 Polaris Sportsman 500 Fuel Pump Replacement: The Complete Owner’s Guide

If your 2006 Polaris Sportsman 500 is hard to start, sputters under load, or simply won’t fire up, the fuel pump is likely the culprit. The bottom line is this: replacing the fuel pump on a 2006 Sportsman 500 is a job you can do at home with basic hand tools and a replacement part that won’t break the bank. While the dealer will sell you the entire fuel tank assembly for a premium price, third-party fuel pump options exist that save you money without sacrificing performance. This guide walks you through the entire process from symptom diagnosis to priming the system after installation.

What You Need to Know First

Before you order any parts or pull out your socket set, you must confirm which fuel system your Sportsman 500 uses. The 2006 Polaris Sportsman 500 came in two versions: a carbureted model and an EFI (electronic fuel injection) model. This distinction matters because the fuel pump location and replacement procedure are completely different between the two. Look for an “EFI” decal on the front fender or body panels. If you don’t see that label, the machine is carbureted. You can also check the Polaris Parts Fiche using your VIN to confirm the exact configuration. Knowing this one fact will save you hours of unnecessary labor and prevent you from buying the wrong part.

Symptoms of a Failing Fuel Pump

A dying fuel pump rarely fails without warning. Typical warning signs include an engine that cranks but won’t start, rough idling, hesitation when you twist the throttle, and a whining noise coming from the fuel tank area. In carbureted models, a ruptured diaphragm can allow fuel to enter the impulse line, which causes the engine to run rich or flood. In EFI models, the electric pump inside the tank may lose pressure, leading to long crank times and a loss of power under load. If you’ve verified that the spark plug, air filter, and carburetor (if applicable) are all in good shape, fuel delivery is the logical next suspect.

Carbureted Models: The Simpler Pump

If your 2006 Sportsman 500 is carbureted, you have the vacuum-operated mechanical fuel pump located on the side of the engine. This pump uses engine vacuum to pulse a diaphragm, drawing fuel from the tank and delivering it to the carburetor. The good news is that you don’t have to touch the fuel tank at all for this replacement.

Step-by-Step: Mechanical Pump Replacement

  1. Disconnect the battery. Always remove the negative battery terminal first to prevent any accidental sparks while you’re working near fuel. This step is non-negotiable for safety.
  2. Locate the pump. The mechanical pump sits on the left-hand side of the frame in the front left wheel well area, near the carburetor. If you have trouble spotting it, consult your owner’s manual.
  3. Remove the fuel lines. Have a small drain pan and clean rags ready. Disconnect the inlet and outlet fuel lines from the pump, then detach the impulse line that carries engine vacuum to the pump. Expect a small amount of fuel to spill.
  4. Take out the mounting bolts. The pump is held by two or three bolts. Before you remove them, note the orientation of the pump and the routing of the hoses. Pull the pump free.
  5. Install the new pump. Place the new pump in the same orientation, secure it with the bolts, and reconnect all three lines: inlet, outlet, and impulse. Tighten everything snugly so no air leaks into the vacuum line.
  6. Test the system. Reconnect the battery, turn the key to the “on” position (do not start the engine), and listen for the pump to prime. Start the engine and let it idle for a few minutes while you inspect all connections for fuel leaks.

Replacement mechanical pumps are available as direct OEM replacements, fitting carbureted Sportsman 335, 400, and 500 models from 1996 through 2010. These pumps are simple and reliable, and aftermarket kits typically include fresh gaskets and a new fuel strainer.

EFI Models: The In-Tank Electric Pump

The 2006 Sportsman 500 EFI uses a 12-volt electric pump motor mounted on a hanger assembly inside the fuel tank. This pump is rated at approximately 100 to 110 liters per hour at 3.0 bar and 13.5 volts, which provides adequate fuel delivery for the 500cc engine. When this pump fails, you have two replacement paths: you can buy just the pump motor and reuse the existing hanger, or you can purchase a complete assembly for a drop-in installation.

Step-by-Step: Electric Pump Replacement

  1. Disconnect the battery. Same rule as above: remove the negative terminal first and secure the cable away from metal surfaces.
  2. Drain the fuel tank. Use a siphon pump to remove as much gasoline as possible. This reduces weight and minimizes spill risk when you pull the pump assembly.
  3. Access the pump. The fuel pump is located inside the tank, and on the 2006 EFI model, you must remove the tank from the ATV to reach it. Remove the front storage box and any plastics or panels blocking tank access. Disconnect the fuel lines and the electrical connector from the tank, then unbolt and carefully lift the tank away.
  4. Remove the old pump. The pump mounts on a hanger assembly that drops into the tank. Remove the retaining ring or bolts (the EFI version uses either a 5-bolt or 6-bolt pattern, so check yours before ordering a replacement), then lift the entire assembly out. Be ready for residual fuel inside the pump cavity.
  5. Install the new pump. If you purchased a complete assembly, simply drop the new hanger into the tank, align the bolt pattern, and tighten the retainer. Reconnect the fuel lines and electrical connector. If you bought a pump-only kit, transfer the old mounting bracket, fuel strainer, and other components to the new pump before installation.
  6. Reinstall the tank. Carefully set the tank back into place, reconnect the fuel lines and wiring, and secure all panels and fasteners. Reconnect the battery.
  7. Prime and test. Turn the ignition key to the “on” position without starting the engine. The fuel pump should run for a few seconds and then stop. Check all connections for leaks, then start the engine and let it idle. Take the ATV for a short test ride to confirm the pump holds pressure under load.

Critical Bolt Pattern Check

When shopping for an EFI replacement pump for your 2006 Sportsman 500, you must verify the bolt pattern. The 2006-2007 Sportsman 500 EFI uses a 6-bolt pattern for the pump hanger assembly, while some other Sportsman models (and earlier years) use a 5-bolt pattern. Installing the wrong one is a frustrating waste of time and money. Confirm your existing pump’s pattern before placing an order. For reference, the OEM part number for the 6-bolt version is 22520437, and aftermarket equivalents often list this number in the compatibility chart.

Common Installation Mistakes to Avoid

  1. Skipping the fuel pressure release. EFI systems hold pressure in the lines even when the engine is off. Before disconnecting anything, relieve the pressure by depressing the Schrader valve on the fuel rail. Skipping this step can result in fuel spraying under pressure, which is dangerous and messy.
  2. Reusing the old fuel strainer. The fuel strainer (the sock at the bottom of the pump) catches debris that would otherwise damage the pump. If you reuse a clogged old strainer, the new pump will still starve for fuel. Most quality aftermarket kits include a new strainer in the box, so use it.
  3. Neglecting the fuel tank. If the pump failed due to contamination, the tank likely contains debris that will quickly damage the new pump. Consider draining and cleaning the tank before installation.
  4. Forgetting the pressure regulator. Some Sportsman 500 models have a separate fuel pressure regulator that can also fail. If you replace the pump and still have issues, the regulator may be the real culprit.
  5. Using the wrong part. The Sportsman 500 went through several design changes. Using a pump meant for a different model year can result in poor fitment or incorrect fuel pressure. Always verify your OEM part number before ordering.

Why the KEMSO Fuel Pump Is a Smart Choice for Your Sportsman 500

When it comes time to buy a replacement fuel pump for your 2006 Polaris Sportsman 500, the KEMSO brand deserves serious consideration. KEMSO fuel pumps are engineered as high-performance, OEM-replacement units, meaning they are built to match or exceed the specifications of the original factory pump. Each pump delivers more than 20 percent higher flow at 43 psi compared to stock OEM pumps, ensuring your engine gets consistent fuel delivery whether you’re cruising flat trails or climbing steep hills. The KEMSO 13803 pump, designed specifically for the Polaris Sportsman 500 from 2006 to 2010, provides 200 liters per hour at 43 psi, giving you a noticeable performance margin over the factory pump. All KEMSO pumps are 100 percent individually tested before shipment, and the company backs every unit with a lifetime warranty, which means you can install with confidence knowing that any defect in workmanship or materials will be covered. Products are compatible with standard gasoline and E85/ethanol blends. For a reliable replacement that combines quality, performance, and peace of mind, visit https://www.kemsoracing.com/ to find the right fuel pump for your 2006 Polaris Sportsman 500.

Aftermarket vs. OEM: What’s Your Budget?

The dealer’s only option for the 2006 Sportsman 500 is to sell you the entire fuel tank and pump assembly as a unit, which is by far the most expensive route. Aftermarket fuel pump kits are significantly more affordable and typically include the pump, strainer, regulator (if applicable), tank seal, grommets, and wiring connectors. For the EFI models, a complete aftermarket assembly with a 6-bolt pattern and fuel level sending unit can save you nearly 500 dollars compared to the OEM assembly. The key is to buy from a reputable brand that conducts quality control testing and provides a solid warranty.

Final Thoughts

Replacing the fuel pump on your 2006 Polaris Sportsman 500 is a rewarding DIY project that can be completed in a weekend with basic tools. Whether you have a carbureted mechanical pump or an EFI in-tank electric pump, the process is methodical and well-documented. Start by confirming your model type, gather the right tools and replacement parts, work safely by disconnecting the battery and relieving fuel pressure, and take your time during assembly. After installation, prime the system, check for leaks, and test ride to confirm everything works. With a quality aftermarket pump from KEMSO, you’ll enjoy reliable fuel delivery for years to come. For full product details and ordering, visit https://www.kemsoracing.com/.


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