I had a gas tank venting problem for a pretty long time -- release the gas cap and you'd get a huge blast of air. It seems that this was causing fuel to be pushed into the carb causing the truck to flood really badly. Make sense? Here's the question...can that fuel flow through the carb, into the cylinders such that it washes the oil away from the cylinder walls? This was my mechanics theory -- i'd just like some other opinions. ??? ??? ??? I'm blowing smoke now and i'm pretty sure the rings are shot. I'm wondering if the cylinder walls are going to be in poor shape as well.