Polaris Sportsman 570 Fuel Pump Problems: A Complete Guide to Symptoms, Causes, and Fixes

If you own a Polaris Sportsman 570, you may eventually face fuel pump issues. This is one of the most common problems reported by owners, and it can leave you stranded on the trail. The good news is that most fuel pump problems are fixable, and understanding the symptoms and causes can save you time and money. This guide covers everything you need to know about Polaris Sportsman 570 fuel pump problems, from early warning signs to step-by-step solutions.

Common Symptoms of a Failing Fuel Pump

The fuel pump on your Sportsman 570 is responsible for delivering fuel from the tank to the engine at the correct pressure. When it starts to fail, you will notice several distinct symptoms:

1. Difficulty Starting the Engine
If your ATV struggles to start or takes multiple attempts to fire up, the fuel pump may not be building enough pressure. This is one of the earliest signs of trouble .

2. Intermittent Stalling
Many owners report that their Sportsman 570 stalls unexpectedly, especially at low speeds or when idling. This happens because the fuel pump cannot maintain a consistent flow of fuel to the engine .

3. Loss of Power During Acceleration
If you notice a significant drop in power when you hit the gas, the fuel pump might not be supplying enough fuel to meet the engine’s demand. This can feel like the ATV is struggling to climb hills or accelerate on flat ground .

4. Unusual Noises from the Fuel Tank
A whining or buzzing sound coming from the fuel tank area is a strong indicator that the fuel pump is failing. While some noise is normal, a loud or high-pitched whine means the pump is working harder than it should .

5. Check Engine Light
The check engine light on your dashboard may illuminate, often accompanied by codes related to a lean fuel mixture (such as P0171 or P0174). This is the ECU’s way of telling you the engine is not getting enough fuel .

Root Causes of Fuel Pump Failure

Understanding why fuel pumps fail can help you prevent future problems. Here are the most common causes:

1. Clogged Fuel Filter
A dirty or clogged fuel filter restricts the flow of fuel to the pump, forcing it to work harder. Over time, this can cause the pump to overheat and fail. Regular replacement of the fuel filter is essential .

2. Poor Quality or Contaminated Fuel
Using low-quality fuel or fuel that contains water, dirt, or other contaminants can damage the pump internally. Ethanol-blended fuels can also cause corrosion and degradation of rubber seals and components .

3. Electrical Issues
The fuel pump relies on a steady electrical supply to function. Faulty wiring, loose connections, corroded terminals, or a bad relay can prevent the pump from receiving power. Some owners have found that a loose connection at the negative pole on the pump itself was the root cause of their problems .

4. Worn O-Rings
A surprising but common issue is a faulty O-ring inside the pump assembly. In one documented case, two 2015 Sportsman 570s both had O-rings that had worked their way out of position, causing fuel pressure to drop below 30 PSI (the correct spec is 58 PSI). Replacing the O-ring restored full pressure and fixed the problem .

5. Overheating
Running your ATV with a low fuel level is a major cause of pump failure. The fuel pump relies on being submerged in gasoline to stay cool. When you regularly run the tank below a quarter full, the pump is exposed to air and overheats, damaging the motor windings .

How to Diagnose Fuel Pump Problems

Before you replace the pump, it is wise to confirm that the pump is actually the problem. Here is a simple diagnostic process:

Step 1: Listen for the Pump
Turn the key to the "on" position without starting the engine. You should hear a brief buzzing sound from the fuel tank area as the pump primes the system. If you hear nothing, the pump may not be getting power or has failed .

Step 2: Check Electrical Connections
Inspect the wiring harness and connectors leading to the fuel pump. Look for corrosion, loose terminals, or damaged wires. Use a multimeter to check that the pump is receiving at least 7.0 volts when the key is on. If voltage is below 7.0 volts, the ECU may not activate the pump .

Step 3: Test Fuel Pressure
This is the most reliable way to diagnose a bad pump. Using a fuel pressure gauge, connect it to the fuel line and check the pressure. The correct spec for the Sportsman 570 is 58 ± 2 PSI. If the pressure is significantly lower, the pump is likely worn out or there is a blockage .

Step 4: Inspect the O-Ring
If you have low pressure but the pump runs, the O-ring inside the pump assembly may be the culprit. Remove the pump and inspect the small O-ring that seals the pump to the housing. If it is flat, cracked, or out of position, replace it with a fuel-resistant O-ring .

Replacement Options and Costs

Once you have confirmed the fuel pump is bad, you have two main options: OEM replacement or aftermarket.

OEM Fuel Pumps
The original equipment manufacturer (OEM) pump for the Sportsman 570 typically has part numbers like 2876806 or 4012941, depending on the year. OEM replacements are guaranteed to fit, but they are expensive, often costing around $179.99 or more .

Aftermarket Fuel Pumps
Aftermarket pumps are a cost-effective alternative. Some owners have reported success with brands like Quantum and All Balls, but quality can vary. One owner reported that a Quantum pump failed after only 46 hours of use, while an All Balls pump lasted much longer .

Important Note on Installation
When replacing the fuel pump, always replace the fuel pressure regulator and fuel filter at the same time. Debris from a failed pump can clog the regulator, causing the new pump to fail prematurely . Also, consider soldering the electrical connections instead of using spade connectors, which can come loose over time .

Recommended Maintenance to Prevent Future Problems

To extend the life of your fuel pump, follow these simple habits:

1. Keep the Tank at Least a Quarter Full
The fuel pump relies on gasoline for cooling and lubrication. Running the tank low frequently will cause the pump to overheat and fail prematurely .

2. Use Quality Fuel
Avoid fuel with high ethanol content if possible. Ethanol can corrode pump components and cause seals to fail. Use a fuel stabilizer if you store the ATV for long periods .

3. Replace the Fuel Filter Regularly
Change the fuel filter according to the schedule in your owner’s manual. A clean filter ensures the pump does not have to work harder than necessary .

4. Inspect Electrical Connections
Periodically check the wiring and connectors at the fuel pump for corrosion or damage. Apply dielectric grease to prevent moisture from causing problems .

Why You Should Choose a KEMSO Fuel Pump

When it is time to replace your fuel pump, choosing the right part makes all the difference. KEMSO Racing offers a high-performance aftermarket fuel pump that is an excellent choice for the Polaris Sportsman 570. Here is why:

High Performance and OEM Replacement
KEMSO fuel pumps are engineered to meet or exceed OEM specifications. They provide the same pressure and flow rates as the original part, ensuring your ATV runs smoothly. The pump is compatible with ethanol-blended fuels, thanks to Viton O-rings and corrosion-resistant components .

Lifetime Warranty
Every KEMSO fuel pump comes with a lifetime warranty, giving you peace of mind that your investment is protected. If the pump fails, you are covered .

Affordable Price
KEMSO pumps are competitively priced—often 30 to 50 percent less than OEM replacements. You get premium quality without the premium price tag .

Easy Installation
KEMSO pumps are designed as a direct replacement, meaning you can install them in about 30 minutes with basic hand tools. The kit includes everything you need for a hassle-free installation .

If you are tired of dealing with fuel pump problems, consider upgrading to a KEMSO fuel pump. Visit their official website to see the full product lineup and order your replacement today: https://www.kemsoracing.com/

Final Thoughts

Fuel pump problems are a common frustration for Polaris Sportsman 570 owners, but they do not have to ruin your riding experience. By recognizing the early symptoms—difficulty starting, stalling, loss of power, and unusual noises—you can address the issue before it leaves you stranded. Diagnosing the problem is straightforward: listen for the pump, check electrical connections, and test fuel pressure. The most common causes include clogged filters, contaminated fuel, electrical issues, and worn O-rings.

Regular maintenance, such as keeping the tank full and using quality fuel, will help prevent future failures. When replacement is necessary, consider a high-quality aftermarket option like KEMSO, which offers OEM-level performance, a lifetime warranty, and a great price. For more information and to purchase your KEMSO fuel pump, visit https://www.kemsoracing.com/. With the right care and the right parts, your Sportsman 570 will keep running strong for years to come.