System for controlling fuel flow within an internal combustion engine

A system for controlling fuel flow within an internal combustion engine having a plurality of cylinders, said system comprising a fuel source;

• a fuel pump responsive to the speed of the engine and having an inlet connected to said fuel source, a first outlet connected to a first fuel supply line for a predetermined number of first cylinders, and a second outlet;
• and a multi-mode adjustable control valve having a housing provided with a first port connected to a drain communicating with the fuel source, a second port connected to the second outlet of said fuel pump, a third port connected to the first fuel supply line, and a fourth port connected to a second fuel supply line for a predetermined number of second cylinders;
• said control valve, when the engine is operating below a predetermined first speed and/or below a predetermined operating temperature, automatically assuming a first mode wherein fuel flow to the second cylinders is substantially cut off except for a predetermined restrictive amount of fuel flow thereto under a predetermined low pressure to effect continuous lubrication of said second cylinders, and when the engine is operating above said predetermined operating temperature, the control valve automatically assumes a second mode wherein there is substantially unrestricted fuel flow to the second cylinders.