A Good Day Turned Bad

I just want to mention, I had an incident once with my 76 w200 many years ago. It may have been caused by my "topping the tank off". The charcoal canister is full.of like BB sized balls of charcoal in it. My truck stalled on me, and was running badly, when I pulled the air cleaner off there were these little, gray-colored balls spilling out of the bowl vent. When I pulled the carb apart it was full of that stuff. I don't know what caused the canister to spill its guts, but I had a suspicion it was due to overfilling the tank. So just a word of caution there