Fuel manifold with jumper tubes

A fuel delivery system for a gas turbine engine having a combustor and a casing surrounding the combustor, the fuel delivery system comprising:

• an external fuel manifold disposed outside the casing and extending circumferentially therearound, the fuel manifold comprising a plurality of inlet manifold tubes circumferentially disposed in serial flow communication, each of the inlet manifold tubes being interconnected to a next circumferentially adjacent inlet manifold tube by a manifold adapter fastened to an outer surface of the casing;
• a plurality of circumferentially spaced apart fuel nozzles mounted to the casing, the fuel nozzles being axially spaced apart from the fuel manifold on the outer surface of the casing;
• and
• a plurality of jumper tubes disposed outside the casing and feeding fuel flow from the fuel manifold to the fuel nozzles, the jumper tubes having a rigidity that is less than that of the inlet manifold tubes of the fuel manifold such that the jumper tubes elastically deflect under load.