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The introduction of synthetic fuels into spark-ignition direct-injection engines requires a deeper understanding of the injection and spray formation process. It also includes spray formation under flash boiling conditions, which has not been of primary importance so far. This research focuses on experimental studies on spray propagation and its morphological features when a moderate flash boiling is achieved. Our main objective is to verify this effect in a multiple nozzle injection system for a selected synthetic fuel. This is accomplished by setting a constant fuel injection pressure and constant volume chamber pressure while increasing the fuel temperature. For comparison purposes, a subcooled injection is also included in the study. The results showed that the spray propagation structure slightly changes due to flash-boiling, but the secondary effects related to the rapid vaporization of the injected fuel in the form of spray collapse are not observed.