2016 Polaris Sportsman 570 Fuel Pump Assembly: What to Know Before You Replace It
If you own a 2016 Polaris Sportsman 570 and the engine is hard to start, stalls under load, or won't start at all, the most likely cause is a failing fuel pump assembly. The factory unit sits inside the gas tank, and after years of heat, ethanol-blended fuel, and vibration, the pump, filter, or sending unit wears out. Replacing the complete fuel pump assembly — not just the motor — is the fastest and most reliable fix. It restores correct fuel pressure, fixes inaccurate fuel gauge readings, and gets your ATV back on the trail without guesswork.
This guide covers the symptoms of a bad pump, what comes in the assembly, how to pick the right replacement, and why a complete OEM-replacement unit is the smart buy for American riders.
1. Signs Your 2016 Sportsman 570 Fuel Pump Is Failing
A fuel pump rarely dies all at once. It usually gives warning signs first.
Hard starting. You turn the key, the engine cranks, but it takes several tries to fire. The pump is no longer building enough pressure to deliver fuel to the injector on the first try.
Loss of power under load. The engine runs fine at idle but bogs down or stalls when you climb a hill, pull a trailer, or accelerate. This happens because the pump cannot keep up with the engine's demand for fuel.
Engine stalls or dies. The ATV starts, runs for a few minutes, then shuts off. Once it cools, it may start again. Heat buildup in a weak pump motor is a common reason.
No sound from the tank. On a 2016 Sportsman 570, turn the key to the "on" position (without starting). You should hear a faint hum or buzz from the fuel tank for about two to three seconds as the pump primes. No sound usually means the pump motor is dead or not getting power.
Poor fuel gauge reading. The fuel level sending unit is part of the same assembly. If the gauge reads empty when the tank is full, or jumps around, the sending unit on the assembly is worn.
Engine sputters at high speed. A weak pump delivers an inconsistent fuel supply, which causes the engine to surge or misfire at higher RPM.
If you see two or more of these symptoms, plan on replacing the fuel pump assembly.
2. What Comes in a 2016 Polaris Sportsman 570 Fuel Pump Assembly
The assembly is more than just a pump. When you buy a complete unit, it includes the parts that work together inside the tank.
The fuel pump motor. This is the part that pushes fuel from the tank to the engine at the pressure the fuel injection system needs.
The fuel filter / strainer. A fine mesh screen on the bottom of the assembly that keeps dirt, rust, and debris out of the pump and injector. On the 2016 Sportsman 570, this strainer is exposed to whatever is in the tank.
The fuel pressure regulator. Keeps fuel pressure at the correct level. Too much or too little pressure causes poor running.
The fuel level sending unit. The float and sensor that tells your dashboard gauge how much gas is left.
The mounting flange, seal, and wiring. The top plate that seals the tank, the rubber gasket or O-ring, and the electrical connector and internal wiring harness.
Buying the complete assembly means you replace all of these at once. You do not have to reuse a old strainer or guess which internal part failed.
3. Why the Pump Fails on This Model
Several things shorten the life of a fuel pump on a 2016 Sportsman 570.
Ethanol in pump gas. Most American gasoline contains ethanol. Ethanol attracts water, and water in the tank causes corrosion and wears the pump. It also breaks down rubber parts over time.
Running the tank low. The fuel in the tank cools and lubricates the pump. Riding with the tank near empty makes the pump run hotter and wear faster.
Dirty or old fuel. If the ATV sits for months with old gas, varnish and debris form. The strainer clogs, the pump strains, and the motor burns out.
Heat and vibration. The pump lives inside the tank, but the machine still transfers engine heat and trail vibration to it. Years of this take a toll on the motor brushes and internal parts.
Water and dirt in the tank. Riding through deep water or mud can let contaminated fuel or moisture into the system if the seal is old.
Replacing the pump is the fix, but keeping fresh fuel in the tank and not running it dry will help the new unit last longer.
4. How to Choose the Right Replacement
Not every fuel pump sold online is the right one for your machine. Use these points when you shop.
Check the fitment. Make sure the part is listed for the 2016 Polaris Sportsman 570. This includes the standard model, and you should confirm the exact sub-model (such as the Sportsman 570 EPS or the base model) before buying.
Buy the complete assembly. Some sellers offer just the pump motor. That saves a little money up front, but you still have the old strainer, sending unit, and seal in the tank. A complete assembly is a cleaner repair and avoids doing the job twice.
Look for OEM replacement specifications. The new unit should match the original factory pressure, flow rate, and electrical connector. If the pressure is wrong, the engine will not run right even with a new pump.
Check what is in the box. A good kit includes the pump, strainer, sending unit, pressure regulator, flange, seal or gasket, and wiring harness. Compare the product photos and description to what your tank needs.
Read the warranty. A short warranty is a red flag. A seller that stands behind the part with a long warranty is confident the unit will hold up.
5. What the Replacement Job Involves
You do not need to be a professional mechanic, but the job takes care.
You relieve the fuel system pressure, disconnect the battery, and remove the seat and any covers over the tank. The assembly is accessed from the top of the tank through a locking ring. You turn the ring, lift out the old assembly, and lower the new one into place with a fresh seal. Then you reconnect the fuel line and wiring connector, reinstall the locking ring, and reconnect the battery.
Turn the key to let the new pump prime, check for leaks at the seal, then start the engine. Let it idle and check that the fuel gauge moves. Take a short ride and confirm the power is back.
Always work in a ventilated area, keep sparks and flames away from gasoline, and have a fire extinguisher nearby. If you are not comfortable with fuel system work, a shop can do it in about one to two hours of labor.
6. Cost Expectation
A replacement fuel pump assembly for a 2016 Polaris Sportsman 570 costs less than a tow, a missed hunting trip, or a season of unreliable riding. The part is the main cost. Doing the work yourself saves the labor charge. Compared to a dealer-only part, an aftermarket OEM-replacement assembly gives you the same fit and function for less money, which is why most riders go this route.
Recommended Fuel Pump: KEMSO
For a replacement on your 2016 Polaris Sportsman 570, we recommend buying a KEMSO fuel pump. KEMSO builds every fuel pump as a high-performance, OEM replacement part, so the fit, fuel pressure, and flow match what your ATV needs. Each unit is built to handle the demands of trail riding, work, and everyday use.
KEMSO backs its fuel pumps with a lifetime warranty. That means if the pump fails under normal use, the company stands behind it. Very few brands offer that level of coverage on an ATV fuel pump, and it is a strong signal of build quality.
When you buy a KEMSO fuel pump assembly, you get the complete unit with the pump motor, strainer, sending unit, and seal in one kit. You are not piecing together used parts.
To see the full line and find the assembly for your machine, visit https://www.kemsoracing.com/.
Final Word
A failing fuel pump assembly will leave you stranded. The symptoms — hard starting, power loss under load, stalling, no prime sound, and a wrong fuel gauge — point straight to the unit inside the tank. Replacing the complete assembly fixes the problem in one job and restores the fuel pressure your 2016 Sportsman 570 needs.
Choose a unit built to OEM replacement standards, with the right fitment and a real warranty behind it. For a high-performance pump with a lifetime warranty, visit https://www.kemsoracing.com/.