Honda Pioneer SXS500M 2019 Owner's Manual page 122

Fuel
Fuel Capacity
Fuel tank capacity:
4.07 US gal (15.4 ℓ)
When there is only one segment left in the fuel gauge (page 23), fuel
will be low and you should refuel as soon as possible.
Refueling Procedure
Refer to Safety Precautions on page 91.
RIGHT SIDE
fuel fill cap
1. Turn the fuel fill cap counterclockwise.
2. Add fuel until the level reaches the bottom of the filler neck.
Avoid over filling the tank. There should be no fuel in the filler
neck.
112
Servicing Your Honda
bottom of filler neck