elastomeric tie layer 14 the tie layer 14 is formed of a suitable elastomer possessing requisite flexibility and durability to separate the thv layer 12 from any additional layers provided for reinforcement and support the intermediate tie layer 14 in addition to permitting a homogeneous bond between the inner and outer layers preferably exhibits additional resistance to permeation of fuel components a reinforcing layer 16 is provided radially outwardly of the inner layer 12 and tie layer 14 in a conventional manner for example the reinforcing layer 16 may be formed by braiding spiralling or knitting a thread consisting essentially of a synthetic fiber such as vinylon fiber polyester fiber or aramid fiber or a natural fiber such as cotton reinforcing layer 16 may be a single or double layer of braided synthetic fibers such as braided 12 nylon fibers a seamless protective organic rubber cover layer 18 is formed on the reinforcing layer 16 the cover layer 18 is preferably non reactive with the external environment and can withstand various shocks vibrational fatigue and changes in temperature as well as exposure to various corrosive or degradative compounds to which it would be exposed during the normal course of operation of the motor vehicle thus the outer layer 18 may be composed of any elastomeric compound which.