If you need to replace the fuel filler cap, use only a genuine Isuzu fuel The use of an improper fuel filler cap could cause fuel spillage in the event of an accident. The use of an improper fuel filler cap could also Crew cab model affect the fuel system and the WARNING emission control system. filler cap. The fuel tank filler cap is provided on the fuel tank. To open, turn the cap counterclockwise. Use diesel fuel at 40 cetane rating or higher . 4JH Do not use any additive fuel or water treatment. NOTE - 2–42 - Fuel tank filler cap CONTROLS AND INSTRUMENTS 4H 4H 4H 4 H Crew cab model