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2. Onboard refueling vapor recovery - Wikipedia

   en.wikipedia.org/wiki/Onboard_refueling_vapor...

   The purge valve controls the purge vapor purge line, through which the manifold vacuum pulls air through the vapor storage device and purges it of fuel vapors. The electronic control unit (ECU) controls the opening and closing of this valve. [8] [dead link ‍]

3. Vehicle emissions control - Wikipedia

   en.wikipedia.org/wiki/Vehicle_emissions_control

   Fuel vapor storage canister for a Peugeot 205. Evaporative emissions are the result of gasoline vapors escaping from the vehicle's fuel system. Since 1971, all U.S. vehicles have had fully sealed fuel systems that do not vent directly to the atmosphere; mandates for systems of this type appeared contemporaneously in other jurisdictions.

4. Crankcase ventilation system - Wikipedia

   en.wikipedia.org/wiki/Crankcase_ventilation_system

   PCV valve on Ford Taunus V4 engine (feeding from left side valve cover into the inlet manifold) A crankcase ventilation system (CVS) removes unwanted gases from the crankcase of an internal combustion engine. The system usually consists of a tube, a one-way valve and a vacuum source (such as the inlet manifold).

5. OBD-II PIDs - Wikipedia

   en.wikipedia.org/wiki/OBD-II_PIDs

   Commanded evaporative purge 0 100 % 2F: 47: 1 Fuel Tank Level Input 0 100 % 30: 48: 1 Warm-ups since codes cleared 0 255 31: 49: 2 Distance traveled since codes cleared 0 65,535 km + 32: 50: 2 Evap. System Vapor Pressure -8,192 8191.75 Pa

6. GMT400 - Wikipedia

   en.wikipedia.org/wiki/GMT400

   The GMT 400 and similar GMT 480 was the platform used for the Chevrolet C/K and GMC Sierra full-size pickup trucks beginning with the 1988 model year. [1] The GMT 410, GMT 420, GMT 425, and GMT 430 variants were derived for full-size SUVs, including the 1992–1994 Chevrolet Blazer and 1995–2000 Tahoe, and the GMC Yukon from late 1991 to 2000.

7. General Motors Atlas engine - Wikipedia

   en.wikipedia.org/wiki/General_Motors_Atlas_engine

   Atlas is a name for a family of modern inline piston engines for trucks from General Motors, used in the GMT355 and GMT360 platforms. The series debuted in 2002 with the Oldsmobile Bravada, and is also used in the Buick Rainier, the Chevrolet TrailBlazer and Colorado, the GMC Envoy and Canyon, the Hummer H3, Isuzu Ascender and i-370, and the Saab 9-7X.