Page 174 - 2019 SHOP MANUAL CRF1000/A/D

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FUEL SYSTEM
SERVICE INFORMATION
FUEL SYSTEM
GENERAL
• Before disconnecting the fuel feed hose, relieve fuel pressure from the system (page 7-4).
• Bending or twisting the control cables will impair smooth operation and could cause the cables to stick or bind, resulting in loss
of motorcycle control.
• Do not snap the throttle valve from full open to full close after the throttle cable has been removed. It may cause incorrect idle
operation.
• Seal the intake ports with tape or a clean cloth to keep dirt and debris from entering the engine after the throttle body or fuel rail
has been removed.
• Do not damage the throttle body. It may cause incorrect throttle valve operation.
• Prevent dirt and debris from entering the throttle bore and air passages after the throttle body has been removed. Clean them
using a compressed air if necessary.
• Do not loosen or tighten the white painted nuts and screws of the throttle body. Loosening or tightening them can cause throttle
valve and idle control failure.
• The parts of the throttle body not shown in this manual should not be disassembled.
• For fuel level sensor inspection (page 22-21).

TROUBLESHOOTING
Engine won’t start
• Deteriorated fuel
• Bent or kinked fuel hose/fuel tank breather hose
• Clogged fuel filter
• Faulty fuel pump or its drive circuit
• Intake air leak
• Faulty fuel injector
• Faulty IACV
• Faulty ignition system
• Faulty ECM/PCM (page 4-39)
• Faulty bank angle sensor or its related circuit (page 4-42)
• Faulty fuel pump relay or its related circuit
• Faulty engine stop switch or its related circuit (page 22-24)
• Blown FI fuse (15 A)
Engine stall, hard to start, rough idling
• Deteriorated fuel
• Bent or kinked fuel hose/fuel tank breather hose
• Faulty IACV
• Intake air leak
• Faulty ignition system
• Faulty MAP sensor (page 4-41)
• Faulty charging system
Backfiring or misfiring during acceleration
• Faulty ignition system (page 5-3)
Engine lacks power
• Bent or kinked fuel hose/fuel tank breather hose
• Clogged fuel filter
• Faulty fuel pump or its drive circuit
• Faulty fuel injector
• Faulty ignition system (page 5-3)
• Clogged air cleaner element (page 3-4)

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