Development of Multi-Layer Plastic Fuel Tanks for Nissan Research Vehicle-II

Plastic fuel tanks are light in weight and rustproof, and have good design flexibility. For those currently in use, however, which are made of mono-layer high-density polyethylene, fuel permeability is too high to meet U.S. evaporative emission standards, which are stricter than those in Japan or the EEC.

For minimize fuel permeation, the formation of a harrier layer of polyamide resin by multilayer (three-resin five-layer) blow molding is considered more promising than sulphonation or fluorination treatment of the polyethylene resin.

This paper describes the fuel permeation mechanism, then outlines the development of a multi-layer plastic fuel tank, discussion its structural features and the development of resins.