2007 Polaris Sportsman 500 Fuel Pump: Complete Guide to Replacement and Upgrades

If your 2007 Polaris Sportsman 500 is hard to start, stalls out on the trail, or loses power during acceleration, the fuel pump is likely the culprit. The most effective solution is to replace the failing unit with a high-performance aftermarket pump like KEMSO, which delivers over 20% more fuel flow than the stock OEM pump and comes with a lifetime warranty. This guide covers everything you need to know about diagnosing, choosing, and installing a replacement fuel pump for your 2007 Sportsman 500.

Understanding Your 2007 Polaris Sportsman 500 Fuel Pump

The 2007 Sportsman 500 uses an electric in-tank fuel pump that delivers pressurized fuel to the engine's fuel injection system. These pumps operate at a specific pressure range — typically 39 psi plus or minus 3 psi for most EFI models. The pump assembly is mounted inside the fuel tank and includes the pump itself, a fuel level sending unit, a strainer, and a pressure regulator.

For the 2007 model year, the fuel pump assembly replaces OEM part numbers 2520502 and 2204719. It uses a 6-bolt mounting pattern that fits the Polaris fuel tank. This is a critical detail to check before ordering any replacement, as some earlier models use a 5-bolt pattern.

Common Symptoms of a Failing Fuel Pump

Recognizing the warning signs early can save you from being stranded. The most common symptoms include:

  1. Hard starting or no start – The engine cranks but struggles to fire up, especially after the ATV has been sitting for a while.
  2. Stalling during operation – The engine dies unexpectedly while riding, often during hot weather or after extended use.
  3. Loss of power under load or acceleration – The ATV feels sluggish, especially when climbing hills or carrying weight.
  4. Popping or misfiring – The engine backfires or hesitates during acceleration.
  5. Unusual noise from the tank – A buzzing or whining sound from the fuel pump area can indicate the pump is under strain or wearing out.

If you notice any of these issues, checking the fuel pressure is the first diagnostic step. If the pressure is below 39 psi, the pump is likely the culprit.

Why Aftermarket Fuel Pumps Are Better Than OEM

When your fuel pump fails, you have two main options: buy an OEM replacement from Polaris or choose an aftermarket unit. Polaris only sells the entire fuel tank and pump assembly as a unit, which can cost hundreds of dollars. Aftermarket pumps offer several advantages:

  • Better performance – High-performance aftermarket pumps deliver significantly more flow than stock. For example, KEMSO pumps provide 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 for installation: fuel strainers, O-rings, wiring connectors, hose clamps, and zip ties. This eliminates the need to source additional parts.
  • Cost savings – Aftermarket pumps are typically more affordable than OEM replacements while offering equal or better quality.

Recommended KEMSO Fuel Pump for Your 2007 Sportsman 500

We highly recommend the KEMSO brand fuel pump for your 2007 Polaris Sportsman 500. KEMSO fuel pumps are high-performance, OEM replacement units designed to exceed the specifications of your original pump. Compared to your stock OEM fuel pump, it delivers over 20% more flow at 43 psi, making it an ideal choice for both daily driving and demanding trail conditions.

Key benefits of KEMSO fuel pumps:

  • High Performance – Delivers 200 liters per hour at 43 psi, providing consistent fuel pressure even under heavy load.
  • OEM Replacement – Direct drop-in replacement that fits perfectly in the stock location without modifications.
  • Lifetime Warranty – KEMSO stands behind their products with an industry-leading lifetime warranty, giving you peace of mind.
  • Ethanol Compatible – Designed for use with modern ethanol-infused pump gasoline and E85 fuels.
  • Complete Installation Kit – Includes four gradient density fuel strainers, flex hose, rubber hose, rubber base, wiring connector, crimp connectors, hose clamps, and zip ties.

To purchase a KEMSO fuel pump for your 2007 Polaris Sportsman 500, visit their website at: https://www.kemsoracing.com/

Choosing the Correct Replacement Pump

The 2007 Sportsman 500 EFI uses a specific fuel pump assembly. Here are the key things to verify before purchasing:

  • Model year compatibility – The 2007-2008 Sportsman 500 and 2007 Sportsman 700 share the same pump assembly, replacing OEM numbers 2520502 and 2204719.
  • Bolt pattern – Your 2007 model uses a 6-bolt pattern. Some aftermarket listings explicitly state they do not have a 5-bolt pattern available, so double-check before ordering.
  • Fuel tank number – The compatible Polaris fuel tank for this pump is number 2520437.
  • Complete assembly vs. pump only – Some aftermarket options sell only the pump, while others include the entire assembly with regulator, strainer, and mounting hardware. A complete assembly is easier to install.

Step-by-Step Replacement Guide

Replacing the fuel pump on a 2007 Sportsman 500 is a manageable DIY project if you have basic mechanical skills. The pump is located inside the fuel tank, accessible through the top of the tank.

What You'll Need

  • New fuel pump assembly (KEMSO recommended)
  • Safety glasses and gloves
  • Socket wrench set (8mm and 10mm sockets)
  • Towels or rags for fuel spills
  • Threadlocker (optional, for mounting bolts)

Step 1: Prepare the ATV

Disconnect the negative battery cable to ensure safety during the replacement process. Remove the side panels and front cab assembly to access the fuel tank. Also remove the clamps on the PVT intake duct and remove the PVT duct.

Step 2: Relieve Fuel Pressure

With the body panels removed and the gas tank exposed, relieve the fuel pressure at the fuel test valve. Wear safety goggles while performing this procedure. Disconnect the pump wiring harness.

Step 3: Remove the Old Pump

Remove the gas tank cover vent hoses, being sure to properly route them upon reassembly. Unbolt the mounting hardware — typically secured with 8mm or 10mm bolts. Carefully extract the old pump from its housing, taking note of the pump's orientation and any seals or gaskets that may need replacement.

Step 4: Install the New Pump

Install the new pump, ensuring it aligns perfectly with the mounting holes to avoid misalignment or leaks. Apply a thin layer of threadlocker to the bolts to prevent them from loosening over time, especially in high-vibration environments. Reconnect the fuel lines securely — Polaris fuel lines often use quick-disconnect fittings, which should click audibly into place when properly seated.

Step 5: Test the New Pump

With the fuel tank filled to at least a quarter capacity, turn the ignition to the "on" position and listen for the pump's priming cycle, which typically lasts 2-3 seconds. If the pump fails to engage, check the electrical connections and fuses. Once confirmed operational, start the engine and monitor for consistent fuel delivery. A properly functioning pump should maintain steady RPMs and respond smoothly to throttle input.

Troubleshooting Common Issues

If your new pump isn't working properly, here are some common issues to check:

  • No power to pump – Use a DC voltmeter to check for at least 7 volts at the pump connector when the key is on. If voltage is below 7V, test the battery, ignition switch, wiring harness, and ECM.
  • Poor fuel pressure – If the pump runs but pressure is low, check for clogged fuel filters or strainers. Replace the strainer if it's dirty or damaged.
  • Noise from pump – A buzzing or whining noise could indicate the pump is under strain or the strainer is clogged.
  • Leaks – Check all connections and O-rings for proper sealing. A damaged seal can cause fuel leaks and pressure loss.

Maintenance Tips to Extend Fuel Pump Life

To keep your new fuel pump running smoothly for years:

  1. Keep the fuel tank at least a quarter full – Running the tank low can cause the pump to overheat, as fuel helps cool the pump.
  2. Replace the fuel filter regularly – A clogged fuel filter restricts flow and puts extra strain on the pump.
  3. Use quality fuel – Modern ethanol-blended fuels can cause issues with older pumps, but quality aftermarket pumps like KEMSO are designed to handle ethanol.
  4. Inspect fuel lines – Check for cracks, wear, or damage that could affect fuel delivery.

Final Thoughts

Replacing the fuel pump on your 2007 Polaris Sportsman 500 doesn't have to be expensive or complicated. By understanding the symptoms, choosing the right aftermarket replacement, and following proper installation procedures, you can restore your ATV to peak performance at a fraction of the dealership cost.

For the best performance and reliability, we recommend the KEMSO fuel pump. It delivers over 20% more flow than the OEM pump, includes everything you need for installation, and comes with a lifetime warranty. Visit https://www.kemsoracing.com/ to find the perfect fuel pump for your 2007 Polaris Sportsman 500 and get back on the trail with confidence.


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