Rather than siphon, I would suggest the same thing as ecohen. There are two lines into the bottom of the FI cars' fuel tank: the fatter one is the nipple that leads to the suction side of the electric fuel pump, and the skinnier one is the return line.
I think you're going to do a better job of draining the old fuel, plus any very fine sediment, if you remove the line from the nipple that goes to the fuel pump.
Once the fuel has been drained, you could look thru the filler neck with a borescope to assess the condition of the tank. Or, with some more work, move the AFM out of the way, open up the access panel thru which the vapor lines run, and then remove the sending unit to get a direct eyeball on the inside of the tank.
Inside the tank, the other end of this nipple had what people call a "filter sock" attached to it, as a rudimentary way of keeping debris in the tank from being ingested into the fuel pump. Depending upon its condition, it may need to be removed...you'll need a set of (really) long reach pliers to snag it.
The owner's manual says the gas tank holds approx. 12.2 US gallons of fuel, so keep that in mind when draining from the bottom....depending upon how much fuel is in the tank, you may need to have several drain pans handy, and may want to use pinch off pliers or vice-grips to stop the flow while you change out pans.