Polaris 570 Sportsman Fuel Pump: The Complete Guide to Replacement, Symptoms, and Performance

Here is the bottom line: If your Polaris Sportsman 570 engine cranks but won't start, sputters under load, or loses power during acceleration, the fuel pump is the part you need to check first. Replacing it with a high-performance aftermarket pump like KEMSO is a direct, affordable fix that restores reliable fuel delivery and often improves performance over the stock unit. This guide walks you through everything you need to know—from identifying a failing pump to installing the replacement yourself.

Why Your Polaris Sportsman 570 Fuel Pump Fails

Fuel pumps in ATVs work hard. They run every time the engine is on, pumping fuel from the tank to the injectors at high pressure. Over time, several factors cause them to wear out:

  • Contaminated fuel: Dirt, water, or debris in the gas tank can clog the pump's internal strainer and damage the motor. Running low on fuel frequently also lets debris from the bottom of the tank get sucked into the pump .
  • Ethanol-blended gasoline: Many modern fuels contain up to 10% or 15% ethanol. Ethanol attracts moisture and can corrode internal pump components that are not designed for it. Stock pumps often use rubber diaphragms and seals that degrade faster with ethanol .
  • Heat and age: The pump relies on the fuel in the tank for cooling and lubrication. Running the tank dry repeatedly causes the pump to overheat, leading to premature failure . Most OEM pumps in ATVs last between 1,500 and 2,000 hours of operation before showing signs of wear .
  • Electrical issues: A failing relay, corroded wiring connectors, or a blown fuse can also cause the pump to stop working, though the pump itself may still be good.

Common Symptoms of a Bad Polaris Sportsman 570 Fuel Pump

Recognizing the warning signs early can save you from being stranded on the trail. Here are the most common symptoms:

1. Engine cranks but won't start. This is the classic sign. You hear the starter motor turning the engine over, but it never fires up. If you do not hear a faint whirring sound from the fuel tank area when you turn the key to the "on" position, the pump is likely not running.

2. Loss of power under load. The ATV may idle fine, but when you hit the gas or climb a hill, it sputters, hesitates, or loses power. This happens because the pump cannot maintain enough fuel pressure to meet the engine's demand.

3. Surging or stumbling at steady speeds. If the Sportsman 570 feels like it is surging forward and then dropping back, even when you hold the throttle steady, the fuel pump may be delivering inconsistent pressure.

4. Difficulty starting after sitting. A failing pump may lose its prime. If the ATV is hard to start after sitting for a few days, but starts fine once it runs, the check valve inside the pump is likely leaking fuel back into the tank.

5. Unusual noise from the fuel tank. A healthy fuel pump makes a quiet, steady hum. If you hear a loud whining, grinding, or clicking sound coming from the tank area, the pump motor is wearing out.

How to Test the Fuel Pump on a Polaris Sportsman 570

Before buying a new pump, do a quick test to confirm it is the problem. You will need a multimeter and a fuel pressure gauge.

Electrical test: Locate the fuel pump connector under the seat or near the tank. With the key on, check for 12 volts at the connector. If you have power but the pump does not run, the pump is bad. If you have no power, check the relay, fuse, and wiring.

Pressure test: Connect a fuel pressure gauge to the service port on the fuel rail. Turn the key on. The pressure should jump to the specification (typically around 43-58 psi for EFI systems) and hold steady. If it reads low or drops quickly, the pump or pressure regulator is failing .

Choosing the Right Replacement Fuel Pump

When it is time to replace the pump, you have three options:

1. OEM Polaris pump. This is the factory part. It will cost more—often $150 to $250 or more—and it will have the same lifespan and performance as the original. It is a safe choice but not the best value.

2. Cheap no-name aftermarket pump. These are tempting because of the low price, often under $40. However, they typically lack quality control, have no warranty, and often fail within months. Many cheap pump suppliers have little or no quality control program, and the parts are not individually tested .

3. High-performance aftermarket pump like KEMSO. This is the best option for most owners. A KEMSO pump is a direct OEM replacement that fits perfectly, delivers more flow, costs less than OEM, and comes with a lifetime warranty .

Why KEMSO Fuel Pumps Are the Best Choice for Your Polaris Sportsman 570

When you are ready to replace the fuel pump on your Polaris Sportsman 570, KEMSO is the brand you can trust. Here is why:

High Performance & OEM Replacement: KEMSO fuel pumps are designed to be a direct drop-in replacement for your stock pump. They are built to match or exceed the original equipment specifications. Compared to the stock OEM pump, a KEMSO pump delivers over 20% more flow at 43 psi, which means your engine gets the fuel it needs for stronger, more consistent power . For the Polaris Sportsman 570, the pump delivers up to 200 liters per hour, compared to the original's 60-80 LPH .

Ethanol and E85 Compatible: KEMSO pumps are designed to work with both standard gasoline and E85/ethanol fuel blends. They use Viton O-rings and components that resist ethanol-related degradation, so you do not have to worry about modern fuels damaging your pump .

Complete Installation Kit: Every KEMSO pump comes with everything you need for a clean install, including gradient density fuel strainers, flexible hoses, tank seals, wiring connectors, and clamps. There is no need to buy extra parts .

Lifetime Warranty: KEMSO stands behind its products. Each pump has a serialized pump body that guarantees a lifetime warranty. This is backed by USA-based technical support, so you can buy with confidence .

Affordable Price: At a regular price of $79.98, the KEMSO fuel pump for the Polaris Sportsman 570 is competitively priced compared to other aftermarket options and significantly cheaper than OEM replacements. You get premium performance and a lifetime warranty at a reasonable cost .

Proven Reliability: KEMSO has been in business since 1999, manufacturing fuel pumps in Houston, TX. Their pumps are individually tested for flow and performance. Independent tests show that KEMSO pumps deliver a measurable improvement in fuel flow consistency, and real-world users report fewer fuel starvation issues during demanding rides .

To order your KEMSO fuel pump and get your Polaris Sportsman 570 back on the trail with reliable performance, visit the official KEMSO website today: https://www.kemsoracing.com/

Step-by-Step Installation Guide for Polaris Sportsman 570 Fuel Pump

Replacing the fuel pump on a Polaris Sportsman 570 is a job you can do at home with basic tools. Plan for about 30 to 60 minutes.

Tools you will need:

  • Socket set (mostly 8mm, 10mm, and 12mm sockets)
  • Flathead and Phillips screwdrivers
  • Pliers
  • Clean rags
  • Small container to catch residual fuel

Step 1: Relieve fuel system pressure. Locate the fuel pump fuse or relay in the fuse box and pull it out. Start the engine and let it run until it stalls. This releases the pressure in the fuel lines. Turn the key off and reinstall the fuse or relay.

Step 2: Disconnect the battery. Remove the negative battery terminal to prevent any electrical shorts while working.

Step 3: Access the fuel pump. On the Polaris Sportsman 570, the fuel pump is located inside the fuel tank. Remove the seat and the plastic panels that cover the top of the tank. You will see a round retaining ring or a set of screws holding the pump assembly in place.

Step 4: Remove the old pump assembly. Carefully disconnect the electrical connector and the fuel lines from the pump module. Use a clean rag to catch any fuel that drips out. Remove the retaining ring or screws and lift the entire pump assembly out of the tank. Note how the fuel level float and wiring are routed.

Step 5: Install the new KEMSO pump. The KEMSO pump kit comes as a complete assembly or a drop-in pump module. If it is a complete assembly, simply lower it into the tank, making sure the float arm does not hit the sides. If you are replacing just the pump motor inside the old assembly, remove the old pump from the housing, transfer the fuel strainer and any rubber grommets, and install the new KEMSO pump. Use the new strainer, hose, and O-rings included in the kit .

Step 6: Reassemble everything. Reinstall the retaining ring or screws. Reconnect the fuel lines and the electrical connector. Double-check that all connections are tight.

Step 7: Test for leaks. Reconnect the battery. Turn the key to the "on" position without starting the engine. The fuel pump should prime for a few seconds. Listen for the whirring sound. Check all fuel line connections for leaks.

Step 8: Start the engine. Start the Sportsman 570 and let it idle. Check again for leaks. Take it for a short test ride to confirm the pump is delivering consistent fuel pressure.

Maintenance Tips to Extend Fuel Pump Life

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

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

Final Thoughts

A failing fuel pump is one of the most frustrating issues you can experience with your Polaris Sportsman 570, but it is also one of the most straightforward to fix. By recognizing the symptoms early, choosing a high-quality replacement like the KEMSO fuel pump, and following the proper installation steps, you can restore your ATV's performance and reliability quickly and affordably.

The KEMSO fuel pump for the Polaris Sportsman 570 is the ideal solution. It offers superior flow, a complete installation kit, and a lifetime warranty at a price that makes sense for any ATV owner. 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 product backed by a lifetime of confidence.

For more information or to purchase your KEMSO fuel pump, visit: https://www.kemsoracing.com/


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