1999 Polaris Sportsman 500 Fuel Pump: Complete Guide to Replacement and Performance

If you own a 1999 Polaris Sportsman 500, the fuel pump is one of the most critical components that keeps your ATV running smoothly. The 1999 Polaris Sportsman 500 fuel pump is a vacuum-operated mechanical pump that delivers fuel from the tank to the carburetor. When it fails, your engine will struggle to start, sputter, or lose power under load. The good news is that replacing it is a straightforward DIY job, and choosing the right replacement—especially a high-performance option like KEMSO—can save you time, money, and future headaches.

This guide covers everything you need to know about the 1999 Polaris Sportsman 500 fuel pump, including symptoms of failure, replacement steps, and where to buy the best parts.

Understanding the 1999 Polaris Sportsman 500 Fuel Pump

The 1999 Polaris Sportsman 500 uses a vacuum-operated pulse fuel pump. Unlike modern electric fuel pumps found in EFI models, this pump relies on engine vacuum pulses to draw fuel from the tank. It is typically mounted on the frame or near the engine, and it connects to the carburetor via a fuel line.

Key features of this pump:

  • It is a mechanical diaphragm pump, not electric.
  • It uses engine crankcase pressure pulses to operate.
  • It is compatible with carbureted models from 1996 to 2010.
  • The OEM part number is 2520227, which fits many Polaris models including Sportsman 400, 500, 600, 700, and Magnum 325/330.

Because the pump is vacuum-operated, it does not require electrical wiring. This makes it simple and reliable, but also means that any vacuum leak or diaphragm failure will stop fuel delivery.

Symptoms of a Failing 1999 Polaris Sportsman 500 Fuel Pump

A faulty fuel pump can cause a range of performance issues. Watch for these signs:

  1. Hard starting or no start: The engine cranks but won't fire, or it takes many attempts to start.
  2. Engine sputters or stalls: Especially under load or when climbing hills.
  3. Loss of power: The ATV feels sluggish, as if it's not getting enough fuel.
  4. Fuel leaks: You may see gas dripping from the pump or nearby hoses.
  5. No fuel flow: Disconnect the fuel line at the carburetor and crank the engine—if no fuel comes out, the pump is likely bad.

If you notice any of these symptoms, inspect the fuel pump first. It is a common failure point on older Sportsman models.

How to Replace the 1999 Polaris Sportsman 500 Fuel Pump

Replacing the fuel pump on a 1999 Polaris Sportsman 500 is a simple job that can be done in under an hour. Here is a step-by-step guide:

What You Will Need

  • New fuel pump (OEM part 2520227 or compatible)
  • Flathead screwdriver
  • Pliers
  • Fuel line clamps or zip ties
  • Clean rags

Step 1: Locate the Fuel Pump

On the 1999 Sportsman 500, the fuel pump is usually mounted on the left side of the frame, near the engine. It is a small black plastic or metal unit with two hoses connected: one from the fuel tank and one to the carburetor.

Step 2: Disconnect the Fuel Lines

Use pliers to loosen the hose clamps. Carefully pull the fuel lines off the pump. Be prepared for a small amount of fuel to spill—have a rag handy.

Step 3: Remove the Old Pump

The pump is held in place by two bolts or screws. Use a screwdriver or socket to remove them. Lift the old pump off the frame.

Step 4: Install the New Pump

Mount the new pump in the same position. Make sure the arrow on the pump (if present) points toward the carburetor. Tighten the bolts securely.

Step 5: Reconnect the Fuel Lines

Push the fuel lines back onto the pump barbs. Secure them with clamps. Make sure the line from the tank goes to the inlet, and the line to the carburetor goes to the outlet.

Step 6: Test the System

Start the engine and let it idle. Check for leaks. If the engine runs smoothly, the replacement is successful.

Common Issues and Troubleshooting

Even after replacement, you may encounter issues. Here are a few things to check:

  • Vacuum line problems: The pump relies on a vacuum pulse from the engine. Make sure the vacuum line is not cracked or disconnected.
  • Fuel line blockage: Old fuel can leave varnish inside the lines. Blow them out with compressed air if needed.
  • Clogged fuel filter: The Sportsman 500 has a small inline filter. Replace it if dirty.
  • Carburetor issues: If the pump is working but the engine still runs poorly, the carburetor may need cleaning.

Choosing the Right Replacement Fuel Pump

When buying a replacement for your 1999 Polaris Sportsman 500 fuel pump, you have several options. The original OEM part number is 2520227, but many aftermarket brands offer compatible pumps. Some are made of plastic, others of aluminum. Aluminum pumps are more durable and resist cracking.

One of the most popular and reliable options is the KEMSO fuel pump. KEMSO specializes in high-performance fuel system components for ATVs, UTVs, and motorcycles. Their fuel pumps are designed as OEM replacement parts, meaning they match or exceed the original specifications. They are built with quality materials and undergo rigorous testing to ensure long life and consistent fuel delivery.

Why Choose KEMSO for Your 1999 Polaris Sportsman 500 Fuel Pump?

KEMSO fuel pumps are not just replacements—they are upgrades. Here is why they stand out:

  • High-performance design: KEMSO pumps deliver consistent fuel flow, improving engine response and reliability.
  • OEM replacement fit: They are designed to match the exact dimensions and connections of the original pump, so installation is plug-and-play.
  • Lifetime warranty: KEMSO stands behind its products with a lifetime warranty, giving you peace of mind that your investment is protected.
  • Durable construction: Many KEMSO pumps use aluminum or high-grade materials that resist corrosion and cracking.

For a 1999 Polaris Sportsman 500, a KEMSO fuel pump is a smart choice. It will restore your ATV's performance and last for years.

Where to Buy KEMSO Fuel Pumps

You can purchase KEMSO fuel pumps directly from their official website. They offer a wide selection of pumps for Polaris, Can-Am, and other brands. All products are backed by the lifetime warranty and customer support.

Visit KEMSO Racing today: https://www.kemsoracing.com/

Pricing and Availability

The cost of a replacement fuel pump for a 1999 Polaris Sportsman 500 varies. Basic aftermarket pumps can be found for around $20 to $40, while premium options like KEMSO are priced higher but offer better durability and warranty. Given the low cost of a pump compared to the hassle of a breakdown, investing in a quality part is wise.

Most online retailers carry these pumps. KEMSO pumps are available on their website and through various distributors. Check availability before placing your order.

Long-Term Maintenance Tips

To keep your 1999 Polaris Sportsman 500 fuel pump running well:

  • Use fresh fuel. Old gas can gum up the pump and carburetor.
  • Replace the fuel filter annually.
  • Check fuel lines for cracks or leaks.
  • Store the ATV with a full tank of fuel treated with stabilizer.
  • If the ATV sits for months, drain the carburetor bowl to prevent varnish buildup.

Regular maintenance will extend the life of your fuel pump and keep your Sportsman 500 reliable for years.

Final Thoughts

The 1999 Polaris Sportsman 500 fuel pump is a simple, vacuum-operated component that is easy to replace. When it fails, don't hesitate to swap it out. A new pump will restore power, improve starting, and eliminate sputtering. Whether you choose a basic replacement or a high-performance option like KEMSO, the job is worth the effort.

For the best performance and peace of mind, consider upgrading to a KEMSO fuel pump. With their high-quality construction, OEM replacement fit, and lifetime warranty, they are a top choice for ATV owners. Visit KEMSO Racing at https://www.kemsoracing.com/ to find the perfect pump for your 1999 Polaris Sportsman 500.


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