Quote: Originally Posted by Old Fart Mike
What else could it be? If it's not plugged then it vents ok?
Bad needle/seat in one of the carbs (or sunk floats, but that's less likely). Had this happen to my dads '97 ZL440. Not terribly hard if you're inclined to do it yourself. There's a few things that can get you into more trouble, and an experienced mechanic could save you. I'm sure they're plenty on the subject to search for so I'll skip the tutorial. I'd get new gaskets while you're into them (and maybe just rebuild your fuel pump while you're at it).
Edit: I should elaborate a bit in the event you don't understand. In the bowl of the carb is a needle and seat assembly that interacts with the floats. It regulates the fuel going into the carb. As the bowl fills, the floats raise a lever and close the valve. When that sticks open (from wear, gummed up, etc), the fuel can flow uninterrupted (often as a syphon) which will cause fuel to flood the carb and flow into your engine. Did you notice gas in the engine compartment too? The carb bowl is vented with two pieces of fuel line, and you should have had gas spilling out of those as well. I had a couple of gallons of gas on my trailer and garage floor when it happened to me. It can be an intermittent problem as they will free up and then stick again down the road.