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Old 23-09-2016, 06:44   #1
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outboard motor question

Hi,
I have a Yamaha 25 horse outboard for my dingy. Yes it is a little big but it came with my 40' sailboat. The engine runs great as long an I keep pumping the flow bulb. I have changed filters in the in my external fuel filter, replaced the bulb and the fuel line thinking there might be a pin hole leak in that but none of that has helped. Any suggestion? My left forearm is beginning to look like Popeye's.
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Old 23-09-2016, 06:55   #2
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Re: outboard motor question

Is the tank vent open?

Do your fittings fit tight? The universal type fittings sometimes leak and/or don't provide a good connection.
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Old 23-09-2016, 07:37   #3
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Re: outboard motor question

I have replaced them when I replaced the fuel line and continually tighten them. I do not seem to get any leakage when trying to increase the pressure on the line. Would a larger diameter fuel line help?
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Old 23-09-2016, 07:48   #4
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Re: outboard motor question

Try cleaning the carburetor. It's easy to take off and dismantle.
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Old 23-09-2016, 08:06   #5
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Re: outboard motor question

Sounds like the classic example of a cracked fuel pump diaphragm to me, easy to replace, looks a lot like a gasket.
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Old 23-09-2016, 08:07   #6
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Re: outboard motor question

Quote:
Originally Posted by a64pilot View Post
Sounds like the classic example of a cracked fuel pump diaphragm to me, easy to replace, looks a lot like a gasket.
Yup, this is what I was going to suggest.
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Old 23-09-2016, 08:26   #7
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Re: outboard motor question

It runs when you squeeze the bulb but not when you don't? Come on guys, you have to think fuel pump first.
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