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I'm pretty sure this is the gas tank vent system. There are a couple of small electrically operated valves in a rectangular plastic housing behind the right front fender liner. I've read some posts where people have fixed it by replacing one of the valves. I think you can also get to the valve body if you take the right side headlight out.
My car sounded like there was a ghost inside the gas cap. Woooooooooo - sort of a flute sound. I drove around for about a month with the fender liner off while checking out my sound. Eventually the wires leading to the valves fell down and rubbed on the tire and wore through. I got a CEL, fixed the wires and never heard the sound again even though I didn't change the valves. I have a feeling my fuel tank pressurized when the wires were broke and somehow the pressure blew out something that was blocking the vent gas path. The valve body housing has a pair of tubes controlled by the valves. I think one goes to the charcoal cannister and the other to the atmosphere near the filler door. The valve housing is filled with some kind of open cell foam that might get clogged with dirt on an old car.
The Durametric unit will cycle the valves if you want to test their action.
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