You can look up all Technical Service Bulletins and Recalls for your vehicle at this link, and yes there is a TSB for the problem you're describing:
http://www.nissan-techinfo.com/
Wow, there is a ton of TSB's for the 09-10 Murano, I understand your frustration, there's got to be 5 times as many as I've got for my 08 Rogue. But you could look on the bright side, at least Nissan is on top of these issues and will fix them on warranty.
It's irrelevant if there is a recall or if it's warranty work, it's all warranty and it's all covered - of course you will never have to pay out of pocket for any repair service when within your warranty period.
Here's the TSB for your fuel gauge problem, just take your car in and it will be fixed under warranty, no big deal guys - and if you want you can quote the exact TSB number but your dealer will already have all of this:
TSB No. NTB10035
IF YOU CONFIRM: The fuel gauge is inaccurate (does not read full when it is actually full), and / or DTC P0463 is stored. ACTION: Replace the fuel level sensor units - main and sub. - Use the parts listed in the Parts Information. NOTE: Do not replace the entire fuel pump assembly for this incident, if it should occur. See this bulletin for further detail.