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2.2 PCV valve’s function: Under the low speed condition, the vacuum of intake manifold is very high, which keep the valve closed, and only a small opening The PCV valve is designed to open fully enough to allow the gas exhaust from the crankcase under high speed or low speed 1. Fuel supply system of the carburetor engine. 1.1 Description the fuel supply system. filter pumped by the into carburetor after filtered through fuel pump. A amount of fuel through return pipe. From crankcase From crankcase The operation condition of low speed-high vacuity To intake manifold The operation condition of high speed- low vacuity To intake manifold Engine Fig.110 schematic drawing of fuel supply system for engine Fig. 111 |