My Boxster always seems to be moaning. :(

[jluetjen]

A quick update after opening up the engine compartment this evening while the car was running on the driveway. The sound is coming from the fuel filter.

That led me here: https://986forum.com/forums/boxster-general-discussions/82728-coke-bottle-noise-fuel-filler-howling-noise.html#post667309

[mikefocke]

After 28 years of these cars, it is hard to come up with a new problem. The trick is finding the right search term. Who would have guessed "coke" would be included.