Abstract: Disclosed is a metering valve for a diesel engine fuel injection system. Two injection systems are shown which embody the valve. The valve includes a spool which is moved in one direction by a stepped cam and is moved in the other direction by a spring. The cam moves the spool at a velocity proportional to engine speed. The spring moves the spool at a velocity proportional to the spring force and independent of engine speed. A mechanical fuel distributor prevents fuel metering by the spool when the cam is moving the spool and allows fuel metering when the spring is moving the spool.