The influence of adjustment and maintenance of fuel supply system of carburetor engine on vehicle emission. The fuel supply system of an oil engine forms an appropriate combustible mixture according to the driving condition of the vehicle. The main points of maintenance adjustment are: cleaning and checking nozzles, main fuel supply holes, idle oil ducts, main air holes, idle air holes: installing and checking adjustment floats; checking and adjusting accelerating pumps and thickening devices; adjusting linkage devices; adjusting idle speed of engines, etc. If the maintenance and adjustment of carburetor is improper, the exhaust emission of engine will exceed the standard. for example<br>
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