Replace Gasoline Fuel Filter (Gasoline Truck and Dual Fuel Truck) Inspect Complete Exhaust System for Leaks, Damage • Perform visual inspection of exhaust system. • Repair any/all leaks found. WARNING Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire. Engine Control Unit(ECU) and others (Low Emission LP Truck) The commander, oxygen sensor and vacuum control solenoid are not serviceable. If faulty, they must be replaced. See Trouble Shooting Section Turn the disconnect switch OFF if fitted or disconnect the battery when changing fuel filters 1 3 2 1. Raise the hood and seat assembly. 2 . Loosen Bolt(1) and clamps(2)(3). 3 .
Replace old fuel filter with new filter. 4 . Fasten Bolt(1) and clamps(2)(3). Inspect Gasoline Carburetor See, gasoline carburetor in Gasoline fuel system section. Inspect Pressure Regulator/Vaporizer See, pressure regulator/vaporizer in LP fuel system section. Inspect LP Mixer (Standard LP Truck) See, LP mixer in LP fuel system section. Inspect Variable Venturi Air/Fuel Mixer (Low Emission LP Truck) See, Variable Venturi Air/Fuel Mixer in LP fuel system(Low emission version) section. G424 Service Manual Maintenance 20