Gascapreleasebutton2000lincoln I have a 2000 Lincoln Cartier Town Car, the gas cap will not release when you push the button on the driver's side door.

SOURCE: Locate the Idle Air Control Valve.

The IAC is at the back of the engine on the left side

SOURCE: Wnere is fuse located for door locks, power seat, and gas cap door on 90 lincoln town car?

dhmwv: your fuse box is located in the passenger's compartment under the dash to the left of the steering column.

SOURCE: my 96 lincoln mark viii gas door will not release

There is A Spring or Spring type Mechanism At the Door that POPS the Door Open Once the Button has been Pushed . And when you Close the Door This Same SPRING ACTION Sorta Fights Against your Closing it. Well it Sounds to me as if this Spring Action is Not Working Properly,
Take a CLOSE Look at this and Be sure This is Working Properly, My References Do NOT Go into DETAIL on this so its Kinda a Common Sense Approach to it.

SOURCE: Lincoln Town Car 1999 driver side window switch

I have the same problem in my 2001 towncar. I removed the switch control panel (without removing the door panel) by prying up from the front of the panel. There's a spring loaded plug under the mirror adjustment. Once you get that pulled up, the whole unit will lift out. Since there's a two year difference in the models - it MAY not work... however, you might not have to remove the whole door panel as you think.
In my case, the wiring was bad.

SOURCE: 2003 Lincoln Town Car - Power window switch removal/installation

SECTION 501-05: Interior Trim and Ornamentation 2003 Town Car Workshop Manual REMOVAL AND INSTALLATION Procedure revision date: 01/28/2002 Front Door Trim Panel Printable View (206 KB) Removal and Installation
NOTE: LH side shown, RH side similar.

1. Disconnect the battery ground cable. For additional information, refer to Section 414-01.

1. Remove the window switch plate.

1. Disconnect the electrical connectors.

1. CAUTION: Use care not to damage the trim panel covers.
   Open the screw covers.

1. Remove the screws and the assist handle.

1. Remove screws and the front door trim.

1. Disconnect the electrical connectors.

1. To install, reverse the removal procedure.