Tracker 4WD V6-2.5L VIN 4 (2001)
Fuel Filler Cap: Description and Operation
FUEL FILLER CAP
Fuel Filler Cap
NOTE: Use a fuel tank filler pipe cap with the same features when a replacement is necessary. Failure to use the correct fuel tank filler pipe cap can
result in a serious malfunction of the fuel system.
The fuel filler cap (1) is a pressure-vacuum type. A built-in torque limiting device on the cap prevents overtightening and also eliminates the escape of
fuel vapors. To install, turn the cap clockwise until a clicking noise is heard. This indicates that the cap is fully seated.
A vacuum relief valve is incorporated into the fuel filler cap. If the pressure in the fuel tank becomes negative (vacuum), the relief valve opens to relieve
the pressure created within the fuel tank. Only when the vacuum becomes excessive within the tank does this occur. Vacuum pressure is also vented
through the tank pressure control valve which is located on the top of the fuel tank.
A pressure relief valve is also located in the fuel filler cap. The pressure of the fuel vapor within the tank should exceed that for which the fuel system is
designed, the pressure relief valve opens, and the excess pressure is vented to the atmosphere. Regular inspection of the fuel filler cap for a correct seal
and any indications of physical damage is recommended.