Basic information on power supply systems of carburetor, gas engines and diesel engines is given. Features of designs, maintenance and repair of fuel equipment are considered, practical recommendations are given for disassembly, assembly, control, adjustment and testing, repair and restoration technology of power supply units and systems. The material complies with the requirements of the "Unified Tariff and Qualification Directory of Jobs and Professions of Workers" in the specialty "Locksmith for fuel equipment of the 2nd - 5th qualification category *. For workers in the specialty "Fitter for fuel equipment."