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The Honda Insight uses a plastic fuel tank.
Use of a plastic fuel tank reduces weight. Also, since the plastic fuel tank will not corrode, it is far less susceptible to developing a leak whereby gasoline and/or gasoline vapours can escape into the environment.
Plastic fuel tanks have been used successfully on other vehicles for a number of years, particularly in Europe. Plastic is also used for transporting and storing gasoline in the form of the commonly seen red plastic "cans".
The Insight's plastic fuel tank is made up of six layers of four different materials:
The EVOH is used because of its impermeability to hydrocarbons. IT ensures that the liquid fuel and vapors are sealed within the tank. The other materials provide structural stability.
The fuel pump is accessible from inside the car. The air intake for the IMA heat sink cooling fan covers the access hole. The rubber intake tube must be removed to gain access to the fuel pump.