Fuel line yellow polyurethane by Granit.
This comes in various internal and external diameters in 7.6m lengths.
33270560 = 2.0mm internal 3.5mm external
33270053 = 2.4mm internal 4.8mm external
33270054 = 3.2mm internal 5.3mm external
33270055 = 4.8mm internal 8.0mm external
33270056 = 6.0mm internal 9.0mm external