. OPERATION DETAILED CONTROLS AND GAUGES to 3 - 9 Fuel Level Monitor This monitor B(2) warns the amount of fuel in the fuel tank. This lamp flashes if the lev el of the remainin g f uel goes approximately 55 liters (14.5 US gal) , so add fuel soon. Air Cleaner Clogging Monito This monitor (3) warns t hat t he air cl eaner is clogged. If the monitor lamp flashes, s top the e ngine, then inspect and clean the a ir cleaner