A gas turbine engine fuel supply system includes a fuel manifold, at least one fuel nozzle, and a hydraulic accumulator. The fuel manifold is adapted to receive fuel supplied thereto from a fuel source. The fuel manifold and the fuel have first thermal expansion characteristics. The at least one fuel nozzle is coupled to the fuel manifold and is adapted to inject the fuel supplied to the manifold into a combustor. The hydraulic accumulator is thermally coupled to, and is in fluid communication with, the manifold. The hydraulic accumulator is configured to exhibit second thermal expansion characteristics that are substantially equivalent to the first thermal expansion characteristics.