Fuel before throttle plate?

[1990 looper]

Hi, I have been restoring a 1990 140 looper. It has been running extremely rich and I assumed it was an ignition problem. More recently I was running it with the air box off. Never did that before. Well, I may have found the problem. Left bank carbs were trickling quite a bit of fuel prior to butterfly plates. The stream seemed to be coming from black bowl vent pipe? Not sure what to call it.

 

[Chris1956]

Looks like the fuel is bubbling up thru the main nozzle. I would check the floats, float adjustment and inlet needles for wear.

 

[1990 looper]

I was watching a vid of a OMC tech rebuilding plastic carbs. He mentioned not to use the float seat seal ring on plastic bowl carbs. Well, I'm fairly certain
I used it and unknowingly raised my fuel level in the bowls too. Even though I leveled the float with the bowl edge, the thickness of the seal would likely raise the fuel level on the main jet pick tube.

 

[flyingscott]

You need to adjust your floats because 3 of the 4 are doing it did you not put the seal in one.