Mercury 3.5 four stroke surging and running very rich

[Tiki91]

2018 Mercury 3.5 hp four stroke surging motor and running very rich I think.water in bucket is very sooty no adjustment screw on carbarator any thoughts? Have a video but can’t post.

 

[Tony Outboard]

Was it running fine before? Remove carb, give it a proper tear down and ultrasonic clean and try again with fresh fuel.

 

[Tiki91]

Was it running fine before? Remove carb, give it a proper tear down and ultrasonic clean and try again with fresh fuel.

Fixed it .it was a hole in vacuum fuel pump diagram.new fuel pump fixed it!

 

[Tony Outboard]

Ideal