Gas Leak
 

I just bought a 1997 Blazer 2 door and there seems to be a small leak around the gas tank. It also only appears to happen when you turn the truck off, so I'm guessing that it may be a fuel line. What do you guys think I should take a look at? I'm not familiar with Chevy's I'm more of a Jeep guy.

First you should make sure that it isnt leaking all the time which would be a sign its a tank leak. If it stops after awhile it it most likely one of the fuel lines if they look anything like mine do then it wouldnt take much to pop a hole in them.

UPDATE: It appears it is leaking from the fuel line, where the rubber goes/turns into the metal. There is a plastic piece where I believe the leak is coming from. I am unsure if this is the return or sending line. But it is the closet one too you.
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The fuel pressure line is 3/8" and the return is 5/16", the vapor line could be 1/4" or 5/16". Dorman makes fuel line repair kits and most auto parts stores carry them. Cut out the bad section with a tubing cutter and match it up at the auto parts store. The new line connects to the existing line with a compression fitting. The worst part of the job is getting to where it's leaking, might have to drop the fuel tank etc.