The injection and spray characteristics of top-feed type injector was investigated under liquid phase
injection fueled with liquefied petroleum gas (LPG). Different pressures and temperatures of fuel injection system were
tested to identify the injection characteristics after hot soaking. MIE-scattering technique was used for verification of
successful liquid phase injection after hot soaking. In case of bottom-feed type injector, the injection was accomplished
at every experimental condition. In case of top-feed type injector, when the pressure of LPG was over 1.2 MPa, the
injection was not executed. However, under the pressure were 1.2 MPa, the liquid phase injection after hot soaking was
accomplished. The engine with top-feed type fuel injection equipment was restarted successfully after hot soaking.