Page 66 - Manual_Polaris_RZR_ProXP-20-21

GENERAL INFORMATION

FUEL SYSTEM DIAGNOSTICS
FUEL SYSTEM TROUBLESHOOTING

FUEL STARVATION / LEAN MIXTURE
SYMPTOMS CAUSES

• Hard start or no start • No fuel in tank
• Bog • Restricted tank vent, or routed improperly
• Backfire • Fuel lines or fuel injectors restricted

• Popping through Intake / Exhaust • Fuel filter plugged
• Hesitation • Fuel pump inoperative
• Detonation • Air leak in system
• Low Power • Intake air leak (throttle shaft, intake ducts, air box
cover)
• Spark plug erosion / fouling
• Faulty oxygen sensor
• Engine runs hot
• Surging
• High / Erratic idle

RICH MIXTURE
SYMPTOMS CAUSES

• Hard start or no start • No fuel in tank
• Bog • Restricted tank vent, or routed improperly

• Backfire • Fuel lines or fuel injectors restricted
• Popping through Intake / Exhaust • Fuel filter plugged
• Hesitation • Fuel pump inoperative
• Detonation • Air leak in system
• Low Power • Intake air leak (throttle shaft, intake ducts, air box
cover)
• Spark plug erosion / fouling
• Faulty oxygen sensor
• Engine runs hot
• Surging
• High / Erratic idle

1.60 9930583 R01 - 2020-2021 RZR PRO XP / XP 4 Service Manual
© Copyright Polaris Industries Inc.