Aston Martin One-77 2010 Owner's Manual page 108

Turn the cap counterclockwise past resistance, then lift
off. Place the cap into its holder. Install the cap by
turning clockwise past resistance, until three 'clicks' are
felt as the cap is fully tightened. Close and latch the fuel
flap.
The fuel system will not let the fuel tank overfill but
there will be times when the fuel nozzle will shut OFF
prematurely. If this happens only try to fill the fuel tank
one more time, continued attempts will result in fuel
spillage. Wait 10 seconds before removing the
refuelling nozzle.
5.22
Fuel Filler Bowl
To stop water gathering in the fuel filler bowl and
flowing into the fuel tank, the fuel filler bowl has a pipe
to let the water drain from the bowl. During fuel filling,
check and make sure that any debris which may block
the pipe is removed.
Fuel Filler Flap Emergency Release
If the filler flap will not open when the release button
is pressed, open the filler flap manually.
Remove the boot rear
storage area cover (C) to
access the manual fuel
filler flap release. Push
the lever (D) towards the
front of the vehicle to
open the filler flap.