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Motor Vehicle Evaporative Emissions Test Procedures

California Environmental Protection Agency. Air Resources Board. Motor Vehicle Evaporative Emissions Test Procedures. Proposed Technical Amendments June 22, 2006. What Are Evaporative Emissions?. Hydrocarbon vapors that escape from vehicle’s fuel system Four types Running loss

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Motor Vehicle Evaporative Emissions Test Procedures

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  1. California Environmental Protection Agency Air Resources Board Motor Vehicle Evaporative Emissions Test Procedures Proposed Technical Amendments June 22, 2006

  2. What Are Evaporative Emissions? • Hydrocarbon vapors that escape from vehicle’s fuel system • Four types • Running loss • Hot Soak • Diurnal • Refueling

  3. Evap Control System Evap Control System FUEL TANK GAS CAP FILL PIPE CARBON CANISTER VAPOR PURGE LINE

  4. Current Evap Regulations • Evap Tests • 3-Day Diurnal + High-Temp Hot Soak, Running Loss • Supplemental 2-Day Diurnal + Hot Soak • ORVR • Adopted 1995 • LEV II Evap • Adopted 1998 • Optional Zero Emission Standard PZEV • In-Use Verification Program

  5. Evap Streamlining • Started 1996 • Collaborative effort • Reduce testing burden • No change in stringency • Guidance letter sent Dec 2002 • U.S. EPA’s Final Rule issued Dec 2005

  6. Proposed TestProcedure Amendments • Evaporative Test Procedures • On-Board Refueling Vapor Recovery • Other minor amendments

  7. Evap Test Procedures • Optional waiver of 2-Day test • Can be demonstrated by results from 3-Day and ORVR tests • Other evap tests provide compliance assurances • Reduces costs and testing time • Clarify alternative Running Loss test provisions • Allows ARB to use manuf’s alternative procedure • Allow optional canister precondition method

  8. ORVR Test Procedures • Makes hose disconnection optional • No Compromise in Stringency

  9. AdditionalProposed Amendments • Address four-wheel drive dynamometer provisions • Update vehicle labeling requirements • Clarify In-Use Verification Program evap test requirements

  10. Staff’s Recommendation • Adopt proposed amendments Thank You

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