Honda FOURTRAX 2018 Owner's Manual page 130

Fuel
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 25), fuel
will be low and you should refuel as soon as possible.
Refueling Procedure
Refer to Safety Precautions on page 103.
(1) fuel fill cap
(2) bottom of filler neck
120 Servicing Your Honda
(1)
(2)