Conversion of an internal combustion engine fitted with a direct injection liquid fuel delivery system to a dual fuel system so that the engine can selectively operate on a primary liquid fuel or a secondary fuel. In a typical application, the primary liquid fuel comprises gasoline and the secondary fuel comprises a liquefied gaseous fuel such as LPG delivered to the engine in a liquid phase. The direct injection liquid fuel delivery system comprises a plurality of liquid fuel direct injectors (15) incorporated in a fuel rail (17) and operable in response to control signals received from an engine control unit (ECU), which is typically the OEM unit (21). The fuel rail (17) communicates with a liquid fuel supply line (13) to receive fuel delivery to the fuel injectors (15) and is fitted with a fuel pressure sensor (23). The conversion provides a dual fuel direct injection system (30) having a gaseous fuel supply (33) including a delivery line (35). The delivery line (35) communicates with a fuel selection valve (37) installed in the liquid fuel supply line (13). With this arrangement, either liquid fuel or a liquid phase of the gaseous fuel can be selectively delivered to the fuel rail (17) and the fuel injectors 15, according to the setting of the fuel selection valve 37. The conversion further involves installation of a supplementary control means in the form of a supplementary ECU (41) which operates in conjunction with the OEM ECU (21). The supplementary ECU (41) is configured to intercept signals from the pressure sensor (23) and to deliver a corresponding interception signal to the OEM ECU (21) to cause the OEM ECU to operate the fuel injectors (15) in a manner designated by supplementary ECU (41).
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