Material Description. This standard covers the material requirements of fuel filler and fuel filler vent hoses (coupled or uncoupled), for use with diesel fuel in automotive fuel systems.

Note: Hoses with Butadiene-Acrylonitrile Copolymer (NBR) lining are not to be used for diesel applications containing biodiesel.

Note: Fuel filler hoses for gasoline applications are specified in GMW15349.

For use in non-conductive environments, all layers of the hose must be non-conductive, and the requirement for non-conductivity must be noted on the part print. For those hoses that need to be conductive, they must meet the conductivity requirements of this specification. MATSPC approval entries for non-conductive hoses must note the non-conductivity of the hose in the approval entry.

The material content of the hose and stiffness of the hose are defined by the Construction and Reinforcement designations for the hose. The Construction and Reinforcement designations for the hose together define the “Type” for the hose. Hoses are suitable for applications subjected to maximum continuous operation temperatures of 100 °C with intermittent operation at temperatures up to 125 °C maximum, with the exception of Construction 4 when used with Biodiesel A which has maximum continuous and excursion temperature limits of 80 °C and 100 °C, respectively.

Construction. Materials covered by this standard are divided into several sets of constructions, reinforcement and fluid compatibility categories. The hose is defined as “GMW15605 Type XYZ,” where “X” refers to the reinforcement of the hose, “Y” refers to the construction type of the hose, and “Z” refers to the biodiesel fuel for which the hose has been determined to be compatible.

Reinforcement: The reinforcement of the hose describes the type of fiber used in the hose. Reinforcement to the tube of the hose may be applied by braiding, knitting or circular weaving. The reinforcement, for Reinforcements A and B, is placed between the laminated tube and the cover of the hose.

Reinforcement A: This reinforcement type consists of aramid fiber.

Reinforcement B: This reinforcement type consists of rayon fiber.

Reinforcement C: This reinforcement type consists of no fiber or other material added to the hose constructions described in 1.1.1.2.

Construction: The “Construction Type” of hose defines the material content and construction of the hose. The following materials are used in the various onstructions:

• Tetrafluoroethylene Hexafluoropropylene (THV)

• Epichlorohydrin/ethylene Oxide (ECO) Copolymer

• Fluoroelastomer (FKM)

• Hydrogenated Butadiene-Acrylonitrile Copolymer (HNBR)

• Chlorinated Polyethylene (CPE or CM)

• Chlorosulfonated Polyethylene (CSM)

• Polyvinylchloride Copolymer (PVC)

• Fluorocarbon Thermoplastic Vulcanizate (FTPV)

• Ethylene Tetrafluoroethylene (ETFE)

The thickness of the barrier layer shall be sufficient to ensure resistance to biodiesel fuels Intermediate layers within the described hose construction may be needed dependent on the hose construction. The descriptions of the constructions of the hose are summarized in Appendix A, Table A1, together with the suffix codes used to describe each type of reinforcement used, hose construction, and biodiesel fuel compatibility.