Fuel Filler Cap: Description and Operation
PRESSURE-VACUUM FILLER CAPThe loss of any fuel or vapor out of the filler tube neck is prevented by the use of a safety filler cap. The cap releases only under significant pressure 17 kPa (2.5 psi). The vacuum release for all gas caps is between 2.0 - 3.0 kPa (0.29 - 0.43 psi). The cap must be replaced by a similar unit in order for the system to remain effective.
WARNING: REMOVE FUEL FILLER TUBE CAP TO RELIEVE TANK PRESSURE BEFORE REMOVING OR REPAIRING FUEL SYSTEM COMPONENTS.
NOTE: THE MALFUNCTION INDICATOR LAMP COULD BE TURNED ON IF THE FUEL FILLER CAP IS LOOSE OR MISSING.