Chrysler Front Wheel Drive Cars 6-CYL 1988-1995 Repair Information

Pressure-Vacuum Filler Cap


Remove the fuel filler cap to relieve the fuel tank pressure. Remove the cap before disconnecting the fuel system components or servicing the fuel tank.


See Figure 1

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.

Click image to see an enlarged view

Fig. Fig. 1: Pressure vacuum filler cap-except Premier and Monaco

The seal between the cap and filler tube breaks when the cap is removed. Removing the cap breaks the seal and relieves the fuel tank pressure. If the filler cap needs to be replaced, only use new filler cap with the same pressure rating.