The book discusses the current state of development of fuel systems for marine diesel engines of all types and dimensions. Along with traditional fuel supply systems, significant attention is paid to hydraulic-driven high-pressure pump plunger systems and common rail battery systems. Theoretical aspects of fuel supply processes in modern injection systems are considered. Attention is paid to issues of improving economic and environmental indicators by improving fuel supply, using gas fuel, as well as by supplying water to the engine working space.