Burner for gas turbine engine

A burner 200 with a pilot fuel nozzle 226 has a pilot fuel passage 310 and a duct 312 surrounding a portion of a length of the pilot fuel passage. The burner can include a mixing zone (206 Fig. 2) to receive a fuel and compressed air, and the mixing zone has an outer wall 210. Coupled to the mixing zone is an exit zone 208 which discharges the air-fuel mixture at an exit surface 218 and includes a pilot fuel exit hole 220. The duct contains fluid that forms an insulation layer around part of the pilot fuel passage, such that in use liquid fuel coking is reduced. The burner can be manufactured by an additive manufacturing process in which a base member having a base surface is provided (404 Fig. 4), and a plurality of layers are added to the base surface to define a tube region with a first layer applied directly to the base surface and each subsequent layer applied to a prior subsequent layer, the plurality of layers cooperating to define a pilot fuel passage having an inlet and outlet (406 Fig. 4). The duct surrounding a portion of a length of the pilot fuel passage is added by an additional plurality of layers, the duct having a first end 314 and a second end 316 (408 Fig. 4).