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Old 05-05-2012, 08:17 AM
ultrastryk ultrastryk is offline
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Anti-siphon valve??

Is this something that all boats have, or just carbs? I have a GT40 with fuel injection. Someone told be to check the anti siphon valve when I mentioned that I have a very bad stumbling in the engine after only one pass. His was in the fitting at the top of the fuel tank, but my fittings on the tank are just plain brass 90 deg angles with brass hose barbs.
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Old 05-05-2012, 01:04 PM
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east tx skier east tx skier is offline
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Did you look inside of those fittings? An ASV is a coast guard required item so that if your fuel line breaks, the gas tank doesn't dump all of your fuel into the bilge.

I have a PCM GT40. The asv is on the barbed fitting on the fuel send line (might have some red tape on that line. Does your barbed fitting unscrew from the 90 degree fitting?
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Old 05-05-2012, 01:18 PM
ultrastryk ultrastryk is offline
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Yes, I pulled the barbed fitting out of the 90 deg. No valves or balls of any type in there. I guess I will call MB SPorts tomorrow and see if they remember where they put them back in 98.
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Old 05-06-2012, 09:09 AM
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Table Rocker Table Rocker is offline
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Another thing you should check is the fuel tank vent. If it is plugged, you will get a few runs in before it starts pulling a suction on the tank and your pump won't be able to pull fuel. After sitting a while the air will creep back in allowing a few more runs before you do it again. Try cracking the fuel filler open after it starts to give you trouble and see if it helps. It's just a shot in the dark, but during storage sometimes the vent outlet looks like a good home for some insects.
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Old 05-08-2012, 07:57 AM
ultrastryk ultrastryk is offline
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Thanks Rocker, I did check the tank vent. It is clear
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Old 05-10-2012, 11:14 AM
ultrastryk ultrastryk is offline
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I called MB Sports, and they can't remember where they put the anti siphon valve in 1998. Maybe it doesn't have one.
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Old 05-10-2012, 12:12 PM
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Pretty sure it's a coast guard requirement. My boat is a 98 as well.
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To me, this forum is about love of inboard boats. It is about the sharing of information and, on a good day, some humor. It is not about post count, brand of boat, or any other superfluous labels that lend themselves to a false sense of superiority. Please, respect one another, try to pass on accurate information, and keep your eye on the ball.
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