[Jerryx]

Here's some info for anyone else who's had trouble getting a good seal on the radiator drain after servicing.

The o-ring on the radiator drain plug often gets cracks and the plug sticks. My o-ring had disintegrated when I removed it, so that explains the leak. You also shouldn't turn it more than 1/2 a turn. You turn it 1/4 turn, pull it out a little, then 1/4 turn more. That's all. I turned mine more and cracked it. A new one costs only $5 at the local parts store (but they had to order it). For that price, it's worth it to put a new one in every time you drain the radiator.

Now for the fuel leak...

Thanks everyone for posting info about intake manifold the vacuum leak. This forum is a life-saver.

Jerry