Honda TRX680FA2011 Owner's Manual page 119

Fuel
Fuel Capacity
Fuel tank capacity:
4.44 US gal (16.8 )
The tank should be refilled as soon as possible when the E segment in
the fuel gauge flashes.
Refueling Procedure
Refer to
Saf ety Precautions
(1)
(1) fuel fill cap
(2) breather tube
112
Servicing Your Honda
on page 99 .
(2) (3)
(3) handlebar cover hole
(4) filler neck
(4)