A system for an engine of a vehicle traveling on the road, comprising of a first fuel injector coupled to a cylinder of the engine, a second fuel injector coupled to said cylinder of the engine, a compression device for compressing intake air delivered to said cylinder, a fuel tank configured to store a fuel, the fuel tank coupled to the first and second injectors, a fuel vapor purge system for delivering vapors of the fuel to said cylinder of the engine and a controller configured to vary an amount of injection of the fuel from at least one of the first and second fuel injectors as a concentration of said vapors varies, and further to vary said amount of injection based on operation of the compression device.