A fuel valve for pilot fluid injection and for injecting gaseous fuel into the combustion chamber of a self-igniting internal combustion engine, said fuel valve comprising: an elongated fuel valve housing with a rear end and a front end, a nozzle with nozzle holes, said nozzle being disposed at the front end of said housing, a gaseous fuel inlet port for connection to a source of pressurized gaseous fuel, an axially displaceable valve needle having a closed position and an open position, said axially displaceable valve needle resting on a seat in said closed position and thus preventing flow from the gaseous fuel inlet port to the nozzle, in said open position said axially displaceable needle has lift from said seat thereby allowing flow from the gaseous fuel inlet port to the nozzle, a pilot fluid port for connection to a source of pilot fluid, a pilot fluid injection conduit extending axially inside said axially displaceable needle, the fuel valve having a pump chamber with an inlet fluidly connected to said pilot fluid port and an outlet connected to a first end of said pilot fluid injection conduit, said pump chamber contracts when said axially displaceable needle is moved from said closed position to said open position and said pump chamber expands when said axially displaceable needle is moved from said open position to said closed position, a second end of said pilot fluid injection conduit being fluidly connected to said nozzle so that pilot oil is delivered to the nozzle when the pump chamber contracts, an actuator system for controllably moving said axially displaceable valve needle between said closed position and said open position, by said axially displaceable valve needle being operatively connected to an axially displaceable actuation piston that is slidably received in said housing and defines together with said housing an actuation chamber, characterized by said actuation chamber being fluidly connected to a control port for connection to a source of control oil. an elongated fuel valve housing with a rear end and a front end, a nozzle with nozzle holes, said nozzle being disposed at the front end of said housing, a gaseous fuel inlet port for connection to a source of pressurized gaseous fuel, an axially displaceable valve needle having a closed position and an open position, said axially displaceable valve needle resting on a seat in said closed position and thus preventing flow from the gaseous fuel inlet port to the nozzle, in said open position said axially displaceable needle has lift from said seat thereby allowing flow from the gaseous fuel inlet port to the nozzle, a pilot fluid port for connection to a source of pilot fluid, a pilot fluid injection conduit extending axially inside said axially displaceable needle, the fuel valve having a pump chamber with an inlet fluidly connected to said pilot fluid port and an outlet connected to a first end of said pilot fluid injection conduit, said pump chamber contracts when said axially displaceable needle is moved from said closed position to said open position and said pump chamber expands when said axially displaceable needle is moved from said open position to said closed position, a second end of said pilot fluid injection conduit being fluidly connected to said nozzle so that pilot oil is delivered to the nozzle when the pump chamber contracts, an actuator system for controllably moving said axially displaceable valve needle between said closed position and said open position, by said axially displaceable valve needle being operatively connected to an axially displaceable actuation piston that is slidably received in said housing and defines together with said housing an actuation chamber,