1996 Mercury Tracer Owner's Manual - Page 244

4. Replace the fuel cap tightly when you are finished. Turn it clockwise until you hear at least three clicks. The ratcheting mechanism allows the fuel cap to be sealed without overtightening. Push the fuel door closed. 5. If you lose the fuel cap, replace it with an authorized Motorcraft or equivalent part. RWARNING If you do not use the proper fuel cap, the pressure in the fuel tank can damage the fuel system or cause it to work improperly in a collision. NOTE: If you replace your fuel cap with an aftermarket fuel filler cap, the customer warranty may be void for any damage to the tank and/or fuel system. Choosing the Right Fuel Use only UNLEADED FUEL in your vehicle. Using leaded fuel is prohibited by federal law. Your warranty may not apply if your vehicle is damaged because you used the wrong fuel. Vehicle inspection programs may detect misfueling. Under these circumstances, you may be required by law to make costly repairs at your own expense. 258