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Outboard troubleshooting. I have a 75 hp Mercury with 2 carbuerators. Serial # 6559142 it's around a 1989 model.. Problem= tank bubble pumps up tight...sits for a minute and gets soft...when I pump it up again tight engine starts and runs good until carburator runs out of gas. Bubble is still tight..let sit for another minute and bubble gets soft .this repeats several times. Engine will start up and run until carburator runs out of gas again. It's like something is restricting gas getting to carburator. Engine has been setting for a few years but gas was always run out of it after running.i have checked from where bubble connects to engine and gas flows thru the connecting tube to engine. There are no fuel leaks. Engine revs and runs good til gas runs out in carburator.

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Chris Phillips

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Sounds like the fuel pump isn't working, you can buy service kits though quite often corrosion will prevent you from removing the valves.. or it could simply be the fuel cap isn't venting, remove fuel cap and see if the engine continues to run!

Posted on Apr 28, 2017

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joboo1

Jim London

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SOURCE: 1991 Johnsoon 90 HP outboard hard to start, floods after stop

Hi, You did a good job of assessing the problem. It sounds like the float valve in the carb is the likely problem. This would overfill the carb when sitting, flooding the engine and the pressure in the bulb pump would go down as the fuel leaked out. Float valve should be investigated and that should Fixya!

Posted on Mar 13, 2009

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