Abstract: A fuel injection, spark ignition, piston type internal combustion piston engine 1 with a fuel sprayer 2 comprising a hollow casing 3. A liquid fuel injector 4 is disposed within the upper end 5a of the hollow interior 5 of the casing 3, and comprises means for injecting liquid fuel into the hollow interior 5. Structure 6 is placed within the hollow interior 5 and is disposed in the path of fuel 7 injected, whereby injected fuel is temporarily deposited on the structure 6. A venturi-shaped passageway 8 enables the induction phase (stroke) of the engine 1 to remove the temporarily-deposited liquid fuel from the structure 6 and into the associated cylinder of the engine 1. The structure 6 comprises an inner body 10 of conical form disposed within an outer body 11 of annular form, so as to define an annular passageway 12 therewith. The sprayer 2 is located by a recessed 22 formed in the air inlet tract 34 of the engine 1.

Abstract: A fuel system for an internal combustion spark ignition engine (27) is provided with a unit (14) for pre-mixing liquid fuel with a part of the total air charge, a spray nozzle (43 117) through which the mixed air/fuel is passed, a heat exchanger (48 102) for heating the mixed air/fuel issuing from the spray nozzle (43 117) to produce a gas and a conduit (49 118) for conveying the gas to the inlet manifold (31 103) of the engine (27) where it mixes with the remainder of the air charge.