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Small craft question
Last Post 04 Jun 2012 07:04 PM by handle. 2 Replies.
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handleUser is Offline
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handle

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03 Jun 2012 07:07 AM
    I have a 15' aluminum boat with a built-in gas tank, powering a 40hp outboard motor. The fuel line dips down below the fuel level, do I need to have a anti-siphon device on the gas tank? It's hard to believe this device will not inhibit the fuel flow to the motor.
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    03 Jun 2012 07:35 PM
    From the USCG Boatbuilders handbook:

    FEDERAL LAW

    183.568 - Anti-siphon protection

    Each fuel line from the fuel tank to the fuel inlet connection on the carburetor must:

    (a) Be above the level of the tank top; or
    (b) Have an anti-siphon device or an electrically operated fuel stop valve:

    (1) At the tank withdrawal fitting; or
    (2) Installed so the line from the fuel tank is above the top of the tank; or

    (c) Provided that the fuel tank top is below the level of the carburetor inlet, be metallic fuel lines meeting the construction requirements of Sec. 183.538 or "USCG Type A1" hose, with one or two manual shutoff valves installed as follows:

    (1) Directly at the fuel tank connection arranged to be readily accessible for operation from outside the compartment, and
    (2) If the length of fuel line from the tank outlet to the engine inlet is greater than 12 feet, a manual shutoff valve shall be installed at the fuel inlet connection to the engine.


    "Anti-siphon protection" is a term applied to the means of preventing the siphon action of permitting fuel to continue to flow out of the fuel tank in the event there is a break or rupture in a fuel distribution line, or if a fitting in the fuel line loosens, creating a leak.

    "Anti-siphon protection" may be accomplished by one or more of the following methods:

    (a) Keep all parts of the fuel line from the fuel tank to the fuel line connection at the carburetor above the level of the top of the fuel tank. The tank top level is determined with the boat in its "static floating position." Practically, the fuel pump and fuel filter(s) must also be above the tank top.

    (b) Install an anti-siphon device at the tank withdrawal fitting. The fuel distribution line may then run below the level of the tank top. A filter may be installed between the fuel tank withdrawal fitting and the anti-siphon device.


    So it appears that the answer is "yes". The fuel flow a 40 HP outboard requires is modest, so don't sweat it. There is probably already an antisiphon valve in the fuel fitting at the tank already.
    handleUser is Offline
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    handle

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    04 Jun 2012 07:04 PM
    Thank you for your responce, I appreciate the info. I set the boat up back in 08, never installed any such device. Time to revisit that area.
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