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Purge valve: how it works, symptoms, problems, testing The purge valve is part of the vehicle Evaporative Emission Control (EVAP) system. The EVAP system prevents fuel vapors in the fuel tank from escaping into the atmosphere. The EVAP system traps fuel vapors from the fuel tank and temporarily stores them in the charcoal canister, see the diagram. EVAP system diagram In modern cars, the purge valve is an electrically-operated solenoid, that is controlled by the engine computer. When the engine is off, the purge valve is closed. When the engine is running and fully warmed up, the engine computer pulses the purge valve open allowing some amount of fuel vapors to be purged from the charcoal canister and burned in the engine. When the purge valve operates, it might produce a rhythmic clicking noise under the hood. The purge flow is monitored by a number of sensors. If the purge flow is less or more than is expected under certain conditions, the computer illuminates the "Check Engine&

Fitter  is an assembling structural framework vocational trade. The duration of trade is two years with four semesters of six months each. There are many things/aspects students learn during course such as fitting and assembling structural frameworks and housings from materials like angle iron, I-beams, and plate steel, using hand-tools and welding equipment and following blueprint specifications: examines blueprints and materials list to obtain parts specifications, etc. The trade is very good from job point of view as it opens many options for self-employment on one hand and further studies options on other hand. There are so many ITIs and other institutes offering trade.     Fitter Trade Eligibility Candidates should be passed in 10 th  Class with Science and Mathematics under 10+2 system of Education or its equivalent from a recognised school board.   Fitter Trade Syllabus Syllabus of Fitter trade as prescribed by various ITIs. Sem. I Sr. No. Subjects of Study     Trade Practical T