What is this noise?

[nikolai]

Originally Posted by kevinkay

just throwing this out -
we have a "vapor leak detection pump" as part of the fuel system. Maybe after shut off it empties and yours is getting noisy??
I believe its under/close the tank (under back seat).

Certainly sounds plausible - no check engine light though, so it's still working OK I guess. I'll have to investigate it more, thanks!

[bcredliner]

Originally Posted by nikolai

Certainly sounds plausible - no check engine light though, so it's still working OK I guess. I'll have to investigate it more, thanks!

Check OBC for code.

[nikolai]

Originally Posted by bcredliner

Check OBC for code.

I did, and there was a P0460 code, which I think is related to the fuel level sensor - when I fill up my tank all the way, the sensor does not work properly and reports less than a full tank. This has not tripped the CEL though, and I'm not sure that it's related at all to this noise...