It varies.
Depending on the fuel pumps ability, the vacuum applied, the condition of the carb seats, fuel delivery, etc.
My normal take, if the engine does not have a problem then there is no problem.
Ended up replacing a fuel pump on my daughters boat last week and the bubble stayed tighter than when I owned the motor.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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