Polaris Ranger 570 Fuel Pump Replacement: A Complete DIY Guide for Owners

If your Polaris Ranger 570 is struggling to accelerate, stalling at idle, or making a strange humming noise from the fuel tank, the fuel pump assembly is likely failing. The quickest and most reliable fix is to replace the entire fuel pump assembly rather than attempting to repair individual components. For most 2014-2022 Polaris Ranger 570 models, this is a straightforward job you can complete in your own garage with basic hand tools, and the typical replacement cost ranges from $80 to $150 for a quality aftermarket unit, compared to $200 or more for an OEM part. This guide walks you through the symptoms, causes, step-by-step replacement process, and the best aftermarket options available — including a strong recommendation for KEMSO fuel pumps.

Recognizing the Symptoms of a Failing Fuel Pump

Before you start tearing things apart, it helps to confirm that the fuel pump is actually the problem. A failing fuel pump on a Polaris Ranger 570 usually shows several clear warning signs.

Poor acceleration and hesitation. When you press the throttle, the engine may sputter or hesitate before responding. This happens because the pump cannot maintain consistent fuel pressure to the electronic fuel injection (EFI) system. The normal fuel pressure for a Ranger 570 should be 58 ± 2 psi (400 ± 14 kPa) . If the pressure drops below that range, the engine will struggle under load.

Frequent stalling, especially at low speeds. A worn-out pump often fails to deliver enough fuel at idle, causing the engine to die when you come to a stop or crawl through rough terrain. This is one of the most common complaints from Ranger 570 owners .

Strange noises from the fuel tank. If you hear a loud humming, whining, or groaning sound coming from the area under the driver seat (where the fuel tank is located), that is a strong indicator the pump is working overtime or has worn bearings . A healthy pump should produce a quiet, steady hum when it primes for a few seconds after you turn the key to the "on" position.

Hard starting or no-start condition. A weak pump may not build enough pressure to start the engine, especially after the vehicle has sat for a while. You might turn the key and hear the pump click but not run, or the engine may crank for several seconds before firing up.

Rattling noise from the fuel tank. Some owners report a rattling sound that seems to come from inside the tank. This is often caused by a loose or broken mounting bracket inside the pump assembly .

Common Causes of Fuel Pump Failure on the Ranger 570

Understanding why fuel pumps fail can help you prevent problems down the road.

Contaminated fuel. This is the number one cause of premature pump failure. Dirt, debris, rust, or even water can enter the fuel system and clog the pump's internal filter or damage the impeller. If you frequently ride in dusty conditions or use fuel from questionable sources, you are at higher risk .

Normal wear and tear. Fuel pumps are mechanical devices with moving parts that wear out over time. The average lifespan of a Polaris Ranger fuel pump is around 50,000 to 70,000 miles, but factors like heat, vibration, and poor maintenance can shorten that significantly.

Electrical issues. A weak battery, corroded wiring, or a faulty relay can prevent the pump from receiving enough voltage to operate correctly. The service manual specifies that the pump should receive at least 7 volts to function. If voltage is below that, you need to check the battery, ignition switch, relays, and wiring harness before blaming the pump itself .

Running the tank low on fuel. Gasoline acts as a coolant and lubricant for the electric fuel pump. Running the tank near empty frequently causes the pump to overheat and draw in air, which accelerates wear.

What You Need Before You Start

Tools and supplies:

  • Socket set with 1/2-inch drive ratchet or breaker bar
  • Fuel pump service tool (PU-50326) or a large spanner wrench
  • Line wrench set for fuel line connections
  • Screwdrivers (flathead and Phillips)
  • Pliers
  • Shop towels or rags
  • Safety goggles and gloves
  • A fire extinguisher (always smart to have nearby)
  • A suitable container for catching residual fuel
  • New fuel pump assembly (make sure it is compatible with your model year)

Safety precautions:

  • Work in a well-ventilated area, preferably outdoors
  • Disconnect the battery negative cable before starting
  • Allow the vehicle to sit for at least one hour after shutting off the engine to let fuel pressure drop and exhaust cool
  • Discharge static electricity by touching a grounded metal surface like the engine block or frame before handling fuel system components
  • Wear safety goggles at all times when working with pressurized fuel

Step-by-Step Polaris Ranger 570 Fuel Pump Replacement

Step 1: Prepare the Vehicle

Park the Ranger on level ground, engage the parking brake, and turn the ignition key to the off position. Remove the driver seat and any storage bin or plastic trim panel that covers the top of the fuel tank. On crew cab models, you may also need to remove the rear seat bottom . Disconnect the negative battery cable to prevent any electrical shorts or accidental activation of the fuel pump.

Step 2: Access the Fuel Pump

The fuel pump on a Polaris Ranger 570 is located inside the fuel tank, underneath the driver seat area. Before you touch anything, clean the top of the fuel tank thoroughly with a shop towel. This is critical — any dirt or debris that falls into the tank during service can clog the new pump or internal fuel filters .

Step 3: Disconnect the Fuel Lines and Electrical Harness

Place a shop towel over the fuel line connector to catch any residual fuel. Disconnect the quick-connect fuel supply line from the pump. A small amount of fuel may spill out, so have your container ready. Then unplug the fuel pump electrical harness connector .

Step 4: Remove the Old Fuel Pump Assembly

Using the Fuel Pump Service Tool (PU-50326) or a large spanner wrench fitted over the PFA nut (the large plastic retaining nut on top of the tank), loosen and remove the nut. Apply downward pressure on the fuel pump flange while you loosen the nut to prevent the assembly from spinning . Once the nut is off, carefully lift the fuel pump assembly out of the tank. Be aware of the float arm and the pump pre-filter as you lift — you may need to tilt the assembly slightly to clear the tank opening. Hold the float arm against the pump body to avoid bending it . Place the old pump in a container that can safely hold any residual fuel.

Step 5: Inspect the Fuel Tank

Before installing the new pump, inspect the inside of the fuel tank. Use a flashlight and mirror if necessary to check for debris, rust, or sediment. If you find any contamination, the tank should be flushed with clean fuel before proceeding. Do not use water or chemicals to clean the tank .

Step 6: Install the New Fuel Pump Assembly

Unpack the new fuel pump assembly. Carefully handle the float arm — do not lift or carry the pump by the float arm. Use the cleaning wipes (often included with aftermarket kits) to clean the fuel tank surface and threads, removing all grease, oil, and debris. Allow the surfaces to dry completely .

Install the new PFA gasket (included with the assembly) onto the fuel pump, taking care not to damage the gasket or bend the float arm. Lower the pump into the fuel tank, holding the float arm against the pump body to avoid snagging. Gently push down on the pump flange to ensure it is centered. Align the orientation mark on the fuel pump with the marks on the fuel tank — this is important to prevent the float arm from interfering with the tank walls .

Thread the new PFA nut onto the fuel tank by hand, ensuring the threads are properly aligned. Then, using the Fuel Pump Service Tool and a torque wrench, tighten the nut to 70 ± 5 ft-lbs (95 ± 7 Nm) . Verify that the orientation marks are still aligned after torquing.

Step 7: Reconnect Everything

Reconnect the fuel pump electrical harness, making sure the connection is clean and secure. Reconnect the fuel supply line by pushing the quick-connect fitting until it clicks into place. Give the line a gentle tug to confirm it is locked.

Step 8: Test the System

Reconnect the negative battery cable. Turn the key to the "on" position (do not start the engine) and listen for the fuel pump to activate. You should hear a brief humming sound as the pump pressurizes the system. If you do not hear anything, check all connections and verify the pump is receiving power. If everything sounds good, start the engine and let it idle for a few minutes. Check for any fuel leaks around the pump flange and fuel line connections. Take the Ranger for a short test drive and monitor performance .

Troubleshooting Tips

If the pump does not activate after installation, you can perform a basic electrical check before assuming the new pump is defective.

Voltage test: Disconnect the harness connector from the fuel pump. Connect a DC voltmeter across terminals 3 and 4 in the plug on the vehicle harness. Turn the key switch on and observe the voltage reading. It should be at least 7 volts. If it is below 7 VDC, inspect the battery, ignition switch, relays, wiring, and ECU .

Continuity test: If voltage is between 7 and 14 volts, turn the key off and use an ohmmeter to check for continuity across terminals 3 and 4 at the white fuel pump connector. If there is no continuity, the pump assembly is defective and should be replaced .

If the pump still does not operate after confirming voltage and continuity, the ECU may be faulty. Try plugging in a known-good ECU from the same model to verify .

Why You Should Choose KEMSO Fuel Pumps for Your Ranger 570

When it comes time to buy a replacement fuel pump, you want a product that delivers reliable performance, matches OEM specifications, and comes with a warranty that gives you peace of mind. KEMSO fuel pumps check all those boxes and more.

High-performance, OEM replacement. KEMSO fuel pumps are designed as direct OEM replacements for a wide range of Polaris models, including the Ranger 570. They are engineered to meet or exceed factory specifications for flow rate, pressure, and durability. This means you get the same fit, function, and reliability as the original part — often at a fraction of the cost.

Lifetime warranty. KEMSO stands behind their products with a lifetime warranty. That is not just marketing talk — it means if your pump ever fails due to a manufacturing defect, KEMSO will replace it. This level of confidence is rare in the aftermarket fuel pump industry and speaks to the quality of their manufacturing.

Built to last. KEMSO uses high-grade materials and precision manufacturing processes to ensure their pumps can handle the demanding conditions of off-road use. Whether you are hauling gear, working the land, or hitting the trails, a KEMSO fuel pump will keep your Ranger 570 running strong.

Affordable pricing. Most KEMSO fuel pumps for the Polaris Ranger 570 are priced around $79.98, which is significantly lower than OEM dealer prices. You get premium quality without breaking the bank.

Easy to find. KEMSO offers a wide selection of fuel pumps for Polaris, Can-Am, Kawasaki, and many other brands. They have a dedicated online store where you can find the exact pump for your vehicle.

To purchase a KEMSO fuel pump for your Polaris Ranger 570, visit their official website at https://www.kemsoracing.com/. You can browse their product catalog, check compatibility, and take advantage of their lifetime warranty. KEMSO is based in Houston, Texas, and ships across the United States.

Preventing Future Fuel Pump Problems

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

Replace the fuel filter regularly. A clogged fuel filter puts extra strain on the pump. The service manual recommends replacing the fuel filter as part of routine maintenance .

Keep the fuel tank clean. Avoid letting dirt, water, or debris enter the tank. Always use a clean fuel container and nozzle when refueling.

Avoid running the tank low on fuel. Try to keep the tank at least one-quarter full to prevent the pump from overheating and drawing in air.

Use high-quality fuel. Fill up at reputable gas stations to minimize the risk of contaminated fuel. If you store your Ranger for extended periods, consider using a fuel stabilizer.

Listen for changes. Pay attention to how your pump sounds. If you notice any new humming, whining, or rattling noises, investigate early before a complete failure leaves you stranded.

Final Thoughts

Replacing the fuel pump on a Polaris Ranger 570 is a manageable DIY project that saves you time and money. The most common symptoms — poor acceleration, stalling, and strange noises — are reliable indicators that the pump needs attention. By following the step-by-step procedure outlined here, you can restore your Ranger's performance and get back on the trail with confidence.

When you are ready to buy a replacement, choose a product that offers proven performance, a solid warranty, and real value. KEMSO fuel pumps deliver all three. Check out their selection at https://www.kemsoracing.com/ and ride with the assurance that your fuel system is backed by a lifetime warranty.


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