Honda FourTrax Rubicon TRX520FA5 2020 Owner's Manual page 147

Fuel Capacity
Fuel tank capacity, including reserve:
3.88 US gal (14.7 ℓ)
Reserve capacity:
1.29 US gal (4.9 ℓ)
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 121.
(1) fuel fill cap
(1)
(2) lower edge of filler neck
Servicing Your Honda
Fuel
(2)
(cont'd)
137