Honda FourTrax Rancher TRX420FA5 2019 Owner's Manual page 36

Indicators & Displays
When the fuel gauge show E _ _ _ _ _ F (4) and LO FUEL (5) blink 3
times alternately and fuel mark blinks, you should refill the tank as
soon as possible.
The amount of fuel reserve is approximately:
1.29 US gal (4.9 ℓ)
(4)
(5)
(4) E _ _ _ _ _ F
(5) LO FUEL
Fuel gauge failure:
If the fuel gauge function fails E - - - - - F (6) will blink.
See your dealer.
(The fuel mark disappears except the fuel gauge display)
(6)
(6) E - - - - - F
26 Instruments & Controls