A fuel line coupling component (e.g., for aircraft fuel lines) allow for axial, rotational and radial displacements. The fuel line coupling component includes outer and inner tubular members with each having coaxially aligned pairs of coaxially sleeved tubular sections that are coaxially displaceable relative to one another. A pair of terminal end connectors includes a journalled connection assembly with the respective opposed distal ends of the outer and inner tubular members to thereby allow simultaneous rotational movements of the outer and inner tubular members about a longitudinal axis thereof and simultaneous radial displacements of outer an inner tubular members relative to a reference plane. C-clamps associated with fuel tank fittings and band clamps allow coupling of the fuel line coupling component to the fuel tank fittings and thereby fluid-connect aircraft fuel tanks (e.g., the aircraft main and auxiliary fuel tanks).