Prowler V6-3.5L VIN G (1999)
Fuel Filler Cap: Description and Operation
PRESSURE-VACUUM FILLER CAP
The fuel filler cap incorporates a two-way relief valve that is closed to atmosphere during normal operating conditions. The relief valve is
calibrated to open when a pressure of 10 kPa (1.5 psi) or vacuum of 6 kPa (1.8 in. Hg) occurs in the fuel tank. When the pressure or vacuum is
relieved, the valve returns to the normally closed position.
CAUTION: Remove the fuel filler cap to release fuel tank pressure before disconnecting any fuel system component. The cap must be removed
prior to disconnecting any fuel system component or servicing the fuel tank.
Pressure Vacuum Filler Cap
A pressure-vacuum relief cap seals the fuel tank. Tightening the cap on the fuel filler tube forms a seal between them. The relief valves in the cap
are a safety feature. They prevent possible excessive pressure or vacuum in the tank. Excessive fuel tank pressure could be caused by a
malfunction in the system or damage to the vent lines.
The seal between the cap and filler tube breaks when the cap is removed and relieves fuel tank pressure.
If the filler cap needs replacement, only use the correct part.
