HFP-383 Fuel Pump Replacement for Ski-Doo MX Z 500SS/600/800/800R X X-RS EFI Replaces 403901812, 513033643, 513033579, 513033507 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. Specifically designed for quiet operation. Replaces Ski-Doo 403901812, 513033643, 513033579, 513033507