Activation of multiple gas needles using a 3/2 pilot valve

A fuel injector for combustible gas, the fuel injector comprising:

• a plurality of combustible-gas nozzle valve elements, each comprising:
• a piston section;
• and
• a hydraulic piston control assembly comprising a pair of control chambers comprising an opening-pressure control chamber and a closing-pressure control chamber separated by the piston section such that the volumes of the opening-pressure control chamber and the closing-pressure control chamber are variable, wherein the combustible-gas nozzle valve element has a stroke controlled by the hydraulic piston control assembly;
• and
• a 3/2-way valve configured to control pressures in at least one of the opening-pressure control chamber and the closing-pressure control chamber of each of the plurality of combustible-gas nozzle valve elements, wherein the 3/2-way valve is configured to fluidly connect the opening-pressure control chamber to a control fluid source and fluidly connect the closing-pressure control chamber to a fluid outflow in a first configuration, and is configured to fluidly connect the opening-pressure control chamber to the fluid outflow and fluidly connect the closing-pressure control chamber to the control fluid source in a second configuration.