2008 Mercury 20 hp stalls after trolling

[Pymie Bill]

After trolling for several hours I can start to smell fuel and when I stop and increase the throttle the engine dies will restart but you have to feather the throttle for several minutes and then it stays running and will run full speed.

 

[flyingscott]

2 strk or 4 strk carb or fuel injected?

 

[Pymie Bill]

Four stroke carb