Permeation barrier fuel tank

A permeation barrier fuel tank (10) for a vehicle includes a tank shell (12) having a wall (18,20,22,24,26,28) formed from a plurality of layers (30,32,34,36,38,40). The layers (30,32,34,36,38,40) include at least an inner layer (30), an outer layer (40), a first fuel permeation barrier layer (34) disposed between the inner layer (30) and the outer layer (40), a flame resistant layer (42) disposed adjacent the outer layer (40) to retard flame and a second fuel permeation barrier layer (46) disposed between the flame resistant layer (42) and the outer layer (40).