Double-walled fuel supply line element

The present disclosure generally refers to a double-walled fuel supply line element (5) configured to be used in a fuel supply system (100) of e.g. middle to large-sized internal combustion engines and a method for manufacturing such a fuel supply-line element (5). The double-walled fuel supply line element (5) may comprise an inner line element (10), an outer line element (40), and a connecting structure (70) configured to fixedly arrange the outer line element (40) around the inner line element (10) such that a tubular hollow space (50) is provided between the inner line element (10) and the outer line element (40). The inner line element (10), the outer line element (40), and the connecting structure (70) may be integrally casted.