Method for controlling fuel injection in a multifuel internal-combustion engine in the event of pressure jumps

A method for controlling fuel injection in a multifuel internal-combustion engine (1) that can inject alternatively a liquid fuel and a gaseous fuel; the control method envisages the steps of: injecting the gaseous fuel by means of at least one corresponding injector (15); cyclically measuring the pressure (P rail ) of the gaseous fuel within the common channel (22); determining at least one upper-limit threshold (P rail-min ; P rail-max ) for the pressure (P rail ) of the gaseous fuel within the common channel (22); comparing the pressure (P rail ) of the gaseous fuel within the common channel (22) with the upper-limit threshold (P rail-min ; P rail-max ); and carrying out an automatic fuel switch from the gaseous fuel to the liquid fuel when the pressure (P rail ) of the gaseous fuel within the common channel (22) exceeds the upper-limit threshold (P rail-min ; Prail-max).