HFP-396-U4 Fuel Pump Replacement for Polaris RZR 4 S XP/570/800 4 S EFI Replaces 2204403, 2204502, 2521069, 2521116, 2521204 Drop-in replacement, 100% Direct OEM fit - no modification necessary, all parts match OEM specifications. Compatible with modern ethanol-infused pump gasoline. This pump is designed and constructed for problem free operation in excess of 100,000 miles or 30,000 hours. Includes an Exact-Fit Installation Kit with the all important Strainer-everything needed for a full easy replacement. Replaces Polaris 2204403, 2204502, 2521069, 2521116, 2521204 This pump installs directly into the OE Polaris assembly and does not require canister modifications of any kind. The pump is dimensionally and functionally identical to the OE pump motor, originally manufactured by Bosch for Polaris. The installation kit includes several items designed to extend longevity beyond the original pump. A new ethanol-safe corrugated flex hose is included, as well as a Viton ethanol safe fuel pump o-ring, and an ethanol safe polyethylene strainer. With pump gasoline now infused in most parts of the country with as much as 15% ethanol, compatibility with multiple fuel blends is crucial for all fuel pump components--not only the pump itself. Pump development of the HFP-396 started in 2013, using the same proven 30mm design from the HFP-389 pump used in KTM and Husqvarna applications, specifically designed for sustained hot climate operation. A weak point of the factory Polaris fuel pump motor is its inability to withstand extreme temperatures. Riders have found themselves on the trail unable to restart after only 20-30 mins of continued run time. Once the pump has cooled down it will usually resume normal operation. Once this happens however, the pump&#039;s life expectancy is limited. The HFP-396 features upgraded polymers, brushes, and carbon commutations to ensure hot climate reliability, as well as pump longevity when using multiple fuel blends (ethanol) found in modern pump gasoline. Polished corrosion-resistant case to help minimize seizing during non-operation Specifically designed for<span class="a-text-bold"><u>quiet</u></span>operation Drop-in replacement Gradient density fuel strainer for superior contaminant filtration Patented check valve technology Compatible with modern ethanol-infused pump gasoline Step-by-Step Installation Guide is included in the kit An installation video demonstrates the removal and installation process A detailed guide is also available, with pictures showing each step along the way to ensure you know exactly what needs to be done, and in what order