1998 Lexus GS 400 Owners Manual - Page 114
1998 Lexus GS 400 Manual
Page 114 highlights
EXTERIOR EQUIPMENT 15G007 2. To remove the fuel tank cap, turn the cap slowly counterclockwise, then pause slightly before removing it. The removed cap can be stored on the back side of the fuel filler door. It is not unusual to hear a slight swoosh when the cap is opened. When installing the cap, turn the cap clockwise until you hear a click. If the cap is not tightened securely, the malfunction indicator lamp comes on. Make sure the cap is tightened securely. The indicator lamp goes off after driving several times. If the indicator lamp does not go off, contact your Lexus dealer as soon as possible. CAUTION D Make sure the cap is tightened securely to prevent fuel spillage in case of an accident. D Use only a genuine Lexus fuel tank cap for replacement. It has a built-in check valve to reduce fuel tank vacuum. 101