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Old 04-12-2013, 13:17   #1
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Dinghy Fuel Mess

I have a 15hp Yamaha 2-stroke and it leaks fuel where the fitting on the end of the hose from the tank connects to the fitting on the engine. It seems the fitting on the engine has a little metal rod in the center of it that pushes the ball in the hose fitting to open it when you connect the two. However, the rod can move side to side and sometimes pushes on the gasket behind the ball in the hose fitting. This cuts the gasket and allows fuel to leak out between the two fittings. At least I think this is what the problem is.

Anyone else have this issue and know how to fix it. I have replaced both fittings several times to no avail.
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Old 04-12-2013, 13:22   #2
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May not be your problem but if the sun is shining on the tank and your air expansion screw is turned tight it will force the gas up the line and will leak right there. Happened once with me.
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Old 04-12-2013, 14:23   #3
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Re: Dinghy Fuel Mess

Are they Yamaha fittings? Sometimes the after market fittings don't fit that well. It is always quite difficult to get that one to click in properly. (Have had 3 of these engines, still have 2).
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Old 04-12-2013, 14:26   #4
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Re: Dinghy Fuel Mess

The main culprit - the engine fitting - is genuine Yamaha. So is the replacement.
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Old 04-12-2013, 14:28   #5
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Pretty sure there is an oring in the fuel line side of the fitting. Of course it could be pinched, cut or missing?
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Old 04-12-2013, 14:45   #6
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Re: Dinghy Fuel Mess

That is the problem. The metal rod in the engine fitting is cutting that o-ring.
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