Motorcycles sold in some markets are equipped with an evaporative (EVAP) emissions control system. See Figure 4-46.
The EVAP system functions as follows:
• The fuel vapor vent tube is connected to the vent tube on the fuel tank top plate. It allows fuel vapors in the fuel tank to be vented to the charcoal canister.
• Under certain engine conditions, the ECM (working in conjunction with the EFI system relay) opens the purge solenoid. Negative pressure (vacuum) draws the fuel vapors in the charcoal canister through the purge tube to the induction module. They are then burned as part of the normal combustion process.
Keep evaporative emissions vent lines away from exhaust and engine. Gasoline is extremely flammable and highly explosive, which could result in death or serious injury. (00266a)
NOTE
The EVAP system has been designed to operate with a minimum of maintenance. Check that all tubes are correctly routed and properly connected. Also, verify that the tubes are not pinched or kinked. Verify that there is no contact between the tubes and engine parts.
Leave a Reply