2008 Polaris Sportsman 500 EFI/X2/Touring/500 H.O. Service Manual, Page 129Get this manual
FUEL INJECTION FUEL INJECTOR
General Information
The fuel injector mounts into the intake manifold, and the fuel rail attaches at the top endReplaceable O-Rings on both ends of the injector prevent external fuel leakage and also insulate it from heat and vibrationInjector problems due to dirt or clogging are unlikely due to the design of the injectors, the high fuel pressure, the use of filters and the detergent additives in the gasolineSymptoms that could be caused by dirtyclogged injectors include rough idle, hesitationstumble during acceleration, or triggering of fault codes related to fuel deliveryInjector clogging is usually caused by buildup of deposits on the director plate, restricting the flow of fuel, resulting in poor spray patternSome contributing factors to injector clogging include; dirty air filters, higher than normal operating temperatures, short operating intervals and dirty, incorrect, or poor quality fuelCleaning of clogged injectors is not recommended; they should be replacedAdditives and higher grades of fuel can be used as preventative measure if clogging has been problem