Honda HHB25 Owner's Manual page 24

1. Check the fuel level visually from outside of the fuel tank while
keeping the fuel filler neck upright.
2. If the fuel level is low, refuel the fuel tank up to the level as
specified. Remove the fuel tank cap gradually to release a pressured
air in the fuel tank. Fuel in the fuel tank may spout out, if the fuel
tank cap is removed quickly.
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FUEL TANK CAP
FUEL TANK
UPPER
FUEL
LEVEL