Thanks again for the help.
The clear tubing is placed between the hardline from the tank and the filter.
The bubbles are coming from the filter side (running backwards in the tubing).
I did take the cap off and ran the car a while -- then had the same bubbles when I shut it down. I guess I'm not getting a vacuum in the fuel tank after all.
Anyone have any good "shop tricks" for zeroing in on where that air squeak is coming from? It may not be anything -- there are always some noises when an engine is shut down. This just sounded so much like air being sucked that I had to check it out.
Is it a bad idea to install a low pressure electric pump before the filter? I wouldn't want to damage anything more.
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