We have a similar situation going on with a Mariner and have narrowed it down to the new fuel fitting on the tank or the new bubble. Fuel tank has been drained, cleaned, inspected, all the way up to the new outlet fitting. Vent too.
When we swap to a remote tank and different hose/bubble, the problem goes away.
On the 48 horse I'd be next thinking like Destroyer, look at changing the coils.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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