Honda TRX250TE 2019 Owner's Manual page 120

Fuel
Fuel Capacity
Fuel tank capacity, including reserve:
9.1 ℓ (2.40 US gal , 2.00 Imp gal)
Reserve capacity:
2.4 ℓ (0.63 US gal , 0.53 Imp gal)
The tank should be refilled as soon as possible after switching to
reserve, and the fuel valve should be returned to the ON position
after refuelling to avoid running out of fuel with no reserve.
Refuelling Procedure
Refer to Safety Precautions on page 97.
(1) fuel fill cap
(2) breather tube
110 Servicing Your Honda
(3)
(2)
(4)
(1)
(3) handlebar cover hole
(4) bottom of filler neck