Every now and then, just after the start on my 93 400E, I hear what I have determined is fuel girgling back into the fuel tank. It only lasts for a few seconds, not on every start and doesn't seem to affect anything. Any idea what that could be? I wouldn't think that there should be any "air" in the system....ever!

make sure ya dont have any gas leaking out.
maybe run through your fuel lines and make sure you dont notice anything out of the ordinary.

Well, that was the first thing I looked for. No leaks!