Fuel Systems

Manufacturer Requirements

Fuel tank fill system hose connections shall be made to a pipe (smooth pipe is acceptable), a spud or a hose fitting. The hose connections may be made by one of the following means:

(a) Swaged Sleeve: This type of connection is usually made by the supplier of a hose assembly, since special machinery or apparatus is necessary to perform the swaging operation. The attachment to the fuel system is usually made by means of a threaded hose fitting.

(b) Sleeve and Threaded Insert: This type of connection usually can be made by an installer using normal shop tools. Usually the sleeve is placed on the outside of the hose and the threaded insert screwed into the inside of the hose and sleeve. There are connections in which the sleeve is installed on the hose after the insert is installed. The attachment to the fuel system is usually made by means of a threaded hose fitting.

(c) Two Adjacent Metallic Hose Clamps That Do Not Depend Solely On The Spring Tension Of The Clamps For Compressive Force: For a fuel tank fill line, 2 hose clamps are usually slipped on each end of the hose in a loosened condition, the hose installed and the hose clamps tightened. The attachment to the fuel system is usually made by means of a beaded, flared or serrated spud, pipe or hose fitting. Hose clamps are to be installed side by side, not on top of each other. Two clamps are required for mechanical strength and to resist any tendency for the hose to twist.

NOTES:

1. Spring wire and other type clamps that depend on the spring tension properties of the clamp material are prohibited from use on fuel line installations on boats.
2. Wire type hose clamps are not acceptable.

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