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vacuum block ??

Coolhand2

New member
Goodday all, I have a old 40 HP Johnson 2 stroke which still runs very well. Recently I went out to sea and ran the motor for about 30 minutes, and as I returned to shore the motor cut out, and would not restart despite the fuel tank being one third full.
I assumed that possibly the fuel tank cap which has a breather on it was too tight and therefore a vacuum built up in the fuel tank thus restricting the fuel flow. after about 1half hour tinkering here and there the motor started again.......Any thoughts ?????
 
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