johnson 9.9 repair or buy another one? - Page 2 - SailNet Community
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post #11 of 19 Old 12-15-2009
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Been awhile but don't these have a fuel pump(vac opperated with diaphram flaps that will stau open if trash present.
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post #12 of 19 Old 12-15-2009
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Did you open the fuel tank vent??

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post #13 of 19 Old 12-15-2009
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I had the same problem with an old Honda outboard. I was the diaphragm in the fuel pump. Had a little hole in the diaphragm and air was getting in through the side where the top and bottom connected.
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post #14 of 19 Old 12-15-2009 Thread Starter
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Yes I have opened the fuel tank vent. What is aggravating me is that it runs great for a good while and then dies after 45 minutes...and this is every time! Of course if i take it to a mechanic It will run fine , so my plan is to find something to use as a stand , buy some of those ear muff looking things , and get some of my buddies that can actually turn a wrench to help me get this guy running before the weather gets warm.
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post #15 of 19 Old 12-16-2009
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You know that if you run it dry you will destroy the water pump impeller.I would try some carb/injector cleaner.
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post #16 of 19 Old 12-16-2009
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Stephen, to follow up on the PM I sent you, the reason for the run time before conking out was based on the engine heating up. When this happened the hole in the diaphragm permitted air through to the fuel chamber. This happened because the two parts of the fuel pump separated enough to pull air in form the outside cutting off the flow of fuel. The diaphram also acted as the gasket seal between the two parts.

You might get a diagram of how your motors fuel pump is designed and see if this is a possibility.

If the motor is in overall good shape I would attemp to find out what is wrong and fix it. The motors today are not built of the quality the older ones where.
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post #17 of 19 Old 12-16-2009 Thread Starter
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Thanks for all of the input guys. I am going to start with the fuel pump and I will keep you guys posted.
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post #18 of 19 Old 12-16-2009
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Tommays was right in that to eliminate the fuel pump as a source of the problem just pump the bulb when the engine starts to stutter. If the fuel pump is sucking air instead fuel when you pump the bulb fuel will leak out the engine fuel pump.

Sometimes a ign. coil will go bad with symtoms like a fuel problem. The coil heats up and breaks down internally and does not spark. This happen almost like clock work. A simple check for this is to take a can of computer cleaner air and cool the coil. If all works well when cool you have found your problem. This test is repeatable, coil gets warm and fails and then you cool it and everything is fine untill it warms up and quits then you cool it and it runs untill warm again.

If the engine passes these tests then go to the carb.

Rick
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post #19 of 19 Old 12-17-2009
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If these have the coil which is magnetically activated by the flywheel ,which I think it dies,sometimes becomes rusty.Been a while since worked on obs.marc
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