Join Date: Apr 2019
Location: Bay of Islands New Zealand
Thanked 0 Times in 0 Posts
Rep Power: 0
Re: Mercury 9.9 problem . . .
Just a note on what I found after experiencing the same problem. In the fuel line connector (clip-on onto the motor), there is a stainless ball that is displaced when connected. The ball sits against a small o-ring in the connector to stop leaks when not connected. A crack in the o-ring caused my motor to draw air with enough fuel for idling an slow running but not enough to run at any significant speed.
Dug out the o-ring, popped in a new one, problem solved. Sounds easy, took me a few hour of fiddling with carbs, etc. before I found this.