Study the effect of air fuel mixture on gasoline engines performance (rich, stoichiometric and Lean mixtures). Study gasoline fuel system components and functions with particular emphasis placed on microprocessor control systems. Injection systems types (construction, operation, testing). Different types of diesel fuel systems, construction, theory of operation, advantages & disadvantages, disassembling, reassembling, testing, and service procedures of each type. Electronically controlled systems will be covered.