Honda TRX500FE1 Owner's Manual page 137

Fuel Capacity
Fuel tank capacity, including reserve:
14.7 ℓ (3.88 US gal, 3.23 Imp gal)
Reserve capacity:
4.9 ℓ (1.29 US gal, 1.08 Imp gal)
When there is only one segment left in the fuel gauge (page 24), fuel
will be low and you should refuel as soon as possible.
Refuelling Procedure
Refer to Safety Precautions on page 111.
(1) fuel fill cap
(1)
(2)
(2) lower edge of filler neck
Servicing Your Honda
Fuel
127