The paper presents results of experiments on operation parameters of a 4-cylinder Holden 2.0 MPFI engine, supplied with LPG by means of sequential intake-manifold injection system, in the function of the distance between the injection ferrule and the cylinder’s inlet valve. Four positions of the injection ferrule along the manifold were tested, i.e. 115, 170, 230 and 310 mm from the valve. Indicated pressure, peak pressure and toxic emissions, in the function of injection start angle, were analyzed and compared for each position. The importance of the distance between injection ferrule and inlet valve was proved.