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The continuing advances being made in microcomputer technology have resulted in its application to an ever increasing range of control systems. The improved performance and flexibility that would be achieved by a microcomputer based diesel engine fuel system cannot be matched by hydromechanical controls of the type currently used. Before an electronic system can be successfully introduced in the harsh heavy-duty truck environment, however, it must meet stringent reliability and durability goals at reasonable cost. This paper outlines some of the problems encountered and solutions implemented in the design of an electronic fuel pump for this market.