2008 Polaris Sportsman 500 Fuel Pump: Complete Replacement Guide and Top Recommendations

If you own a 2008 Polaris Sportsman 500 and you are dealing with hard starting, stalling on the trail, or a noticeable loss of power during acceleration, the fuel pump is almost certainly the problem. The fuel pump in the 2008 Sportsman 500 is an electric in-tank unit that delivers pressurized fuel to the EFI system, and when it begins to fail, these performance issues follow quickly. The good news is that replacing it is a straightforward DIY project that can save you hundreds of dollars in dealership labor costs, and choosing a high-performance aftermarket pump like KEMSO will not only restore your ATV but actually improve its fuel delivery. This guide covers everything you need: symptoms to watch for, which pump fits your machine, how to install it, and maintenance tips to extend its life.

Understanding the 2008 Polaris Sportsman 500 Fuel Pump System

The 2008 Sportsman 500 uses an electric fuel pump that sits inside the gas tank. This pump pushes fuel at a specific pressure range, typically around 39 psi plus or minus 3 psi for most EFI models. When the pump wears out, it cannot hold this pressure, which creates a chain reaction of fuel delivery problems that affect every part of the engine's performance.

The pump assembly itself includes the pump motor, a pressure regulator, fuel strainers, and the mounting hardware that connects to the top of the tank. It is important to understand that the 2008 model shares the same pump assembly with the 2009 Sportsman 500 as well as the 2008-2015 Sportsman 800 models. This means replacement options are widely available across multiple aftermarket brands.

Common Symptoms of a Failing Fuel Pump

Recognizing the early warning signs can prevent you from being stranded far from home. Here are the most common symptoms reported by owners of the 2008 Sportsman 500:

  1. Hard starting or no start at all – The engine cranks over but struggles to fire, especially after the ATV has been sitting for a while.
  2. Stalling during operation – The engine dies unexpectedly while riding, often in hot weather or after extended use.
  3. Loss of power under load – The ATV feels sluggish on hills or when carrying weight.
  4. Popping or misfiring – The engine backfires or hesitates during acceleration.
  5. Intermittent quitting in hot weather – The pump fails during sustained high-temperature operation, a common issue with Polaris ATVs.

If you experience any of these, the first step is to test fuel pressure. If it reads below 39 psi, the pump is the likely culprit.

Which Fuel Pump Fits the 2008 Polaris Sportsman 500?

Choosing the correct pump is critical, as the Sportsman 500 went through multiple generations with different pump designs. For the 2008 model year specifically, here is what you need to know:

For the 2008-2009 Sportsman 500 and 2008-2015 Sportsman 800 models, the same pump assembly is used. This assembly replaces OEM part numbers 2520865, 2204308, 2521230, and 2520895. Many aftermarket assemblies also cross-reference part number 47-1014.

For the 2007-2008 Sportsman 500 and 2007 Sportsman 700, a different assembly is used, replacing OEM numbers 2520502 and 2204719.

For 2008-2009 Sportsman 500 EFI models including the X2, Touring, and 700 X2 variants, there are specific compatible modules available.

It is worth noting that some 2008 models may have a 6-bolt pattern on the top hat of the assembly, and some aftermarket pumps require modification to match this pattern. Always verify your specific model variant before purchasing.

OEM vs Aftermarket: What Is the Best Choice?

When your fuel pump fails, you have two main paths: buy a genuine Polaris OEM pump or choose an aftermarket replacement. Here is how they compare:

OEM pumps are guaranteed to match your original specifications, but they come with a premium price tag that can reach hundreds of dollars.

Aftermarket pumps from reputable brands like KEMSO offer several clear advantages:

  • Better performance – KEMSO pumps deliver 200 liters per hour at 43 psi, compared to the original 60-80 liters per hour from many OEM pumps. This means your engine gets the fuel it needs even under demanding conditions.
  • Enhanced durability – Quality aftermarket pumps use upgraded materials, including corrosion-resistant casings, improved brushes, and better commutators that withstand modern ethanol-blended fuels.
  • Complete kit – Most aftermarket pumps come with everything you need: fuel strainers, O-rings, wiring connectors, hose clamps, and zip ties. No need to source additional parts.
  • Cost savings – Aftermarket pumps are typically more affordable than OEM replacements while offering equal or better quality.

DIY Installation Guide for the 2008 Sportsman 500 Fuel Pump

Replacing the fuel pump on a 2008 Sportsman 500 is a manageable weekend project for anyone with basic mechanical skills. The pump is located inside the fuel tank, accessed through the top of the tank. Here is a step-by-step breakdown:

Step 1: Prepare Your Workspace

Start by making sure the ATV is on a level surface and the engine is cool. Disconnect the negative battery terminal to prevent any electrical shorts. Remove the seat and any body panels that block access to the fuel tank.

Step 2: Relieve Fuel Pressure

Run the engine until it stalls, then try starting it a few more times to clear remaining pressure. Alternatively, remove the fuel pump fuse and crank the engine for a few seconds. This prevents fuel spray when you open the system.

Step 3: Remove the Old Fuel Pump

Disconnect the electrical connector and fuel lines from the top of the pump assembly. Note the orientation of the lines before removal. Unscrew the retaining ring or bolts that hold the assembly in place, then lift the pump assembly out of the tank.

Step 4: Install the New Pump

If you purchased a complete assembly, installation is straightforward: transfer the new pump into the tank, align the mounting holes, and secure the retaining ring. If you purchased just the pump motor, you will need to swap it into the existing hanger assembly. Be careful with the O-rings and seals; apply a small amount of clean engine oil to help them seat properly.

Step 5: Reconnect and Test

Reconnect the electrical connector and fuel lines, reinstall the seat and body panels, and reconnect the battery. Turn the ignition key to the "on" position without starting the engine; you should hear the fuel pump prime for a few seconds. Then start the engine and check for leaks.

Why You Should Choose KEMSO for Your 2008 Sportsman 500 Fuel Pump

When it comes to replacing your fuel pump, KEMSO stands out as the top choice for ATV owners who want reliability, performance, and peace of mind. KEMSO fuel pumps are designed as high-performance, direct OEM replacements that deliver over 20% more flow at 43 psi compared to stock pumps. This means your 2008 Sportsman 500 gets improved fuel delivery that supports better throttle response and overall engine performance.

Every KEMSO pump is engineered to handle both gasoline and E85/ethanol blends, using upgraded polymers, brushes, and commutators to resist premature failure from modern fuels. Each pump is individually tested before shipment, and the company follows strict quality control standards that many cheap unbranded aftermarket parts simply do not have.

The KEMSO pump for the Polaris Sportsman 500 (2006-2010) is part number 13803. The complete kit includes the pump, a gradient density fuel strainer, flex hose, tank seal, Viton grommets, a wiring connector, crimp connectors, hose clamps, and zip ties – everything you need for a clean installation. The pump delivers 200 liters per hour at 43 psi and 13.5 volts, with an operational pressure range of 43-68 psi.

Best of all, KEMSO backs their fuel pumps with a lifetime warranty, giving you long-term confidence that your investment is protected. At a regular price of $79.98, it is competitively priced compared to other aftermarket options and significantly cheaper than OEM replacements that can cost hundreds of dollars.

Visit https://www.kemsoracing.com/ to order your KEMSO fuel pump and get your 2008 Sportsman 500 back on the trail with better performance than ever before.

Maintenance Tips to Extend Fuel Pump Life

Once you have installed a new fuel pump, a few simple habits will help it last longer:

  1. Use fresh fuel – Stale fuel leaves deposits that clog the pump and strainer. If you store your ATV for long periods, add a fuel stabilizer.
  2. Keep the tank full – Running the tank low regularly causes the pump to suck in air and debris from the bottom. A full tank also reduces condensation inside the tank.
  3. Change the fuel filter – If your ATV has an external fuel filter, replace it according to the manufacturer's schedule. This protects the pump from contamination.
  4. Avoid running on empty – The fuel pump relies on gasoline for cooling and lubrication. Running dry can overheat the pump and cause premature failure.

Final Thoughts

A failing fuel pump is frustrating, but it is one of the most straightforward fixes on the 2008 Polaris Sportsman 500 EFI. By recognizing the symptoms early, choosing a high-quality replacement like the KEMSO 13803 pump, and following proper installation and maintenance practices, you can restore your ATV's performance and reliability quickly and affordably. Do not settle for a cheap, untested pump that may fail again in a few months. Invest in KEMSO quality and enjoy the peace of mind that comes with a lifetime warranty.

For the best replacement fuel pump for your 2008 Polaris Sportsman 500, visit https://www.kemsoracing.com/ today. Their high-performance, OEM-replacement fuel pumps are backed by a lifetime warranty and will get your Sportsman back to peak performance in no time.


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