Could you please elaborate.
How was it determined, the enrichment circuit, is the cause?

I'll give an example of what could have happened to me:
This is no pun intended ......

I decide to measure the fuel pressure going into the carbs. I had a 0-100psi gauge, at the time, and was measuring 30 psi.
Looking at the throats ... the fuel pump was "on" and gasoline was down pouring the intakes overflowing the tubes right down to the throttle plates.
Took the fuel system apart to realize there were 2-3 kinks on the fuel return line causing this high pressure.
To add fuel to the fire (so to speak) 4,5 and 6 bank were missing idle mixture o rings, all the pump discharge nozzles were siliconed into the housing. (Siliconed for crying out loud)
The jets at the bottom of the float chamber (pump discharge and enrichment) were blocked.

Now this could have caused a nice marshmallow roasting http://forums.pelicanparts.com/support/smileys/vuur.gif
Sorry for the dramatics ..... I had to relieve myself.

Risk of fire per post #37.

Oh, Now I get it!
That’s why your suggestion was to keep it inoperative.

Thanks Paul