Why on a 1998 Lincoln Town Car if the fuse has been changed why want the air suspension air up?
Based on my experience with my 1996 Town Car, the reason that the air suspension won't lift is most likely that the air bags in the back have developed leaks which causes the pump to burn out from continuous operation. Cost for replacing the system can range from hundreds to a couple of thousand dollars depending on part cost and repair facility. Normal springs may be substituted for the air system. It is a matter of opinion whether this deteriorates the car's ride, however it eliminates the need to replace the air suspension system every 80,000 miles or so.
Sounds like you might be running into the same problem I had with my 93 town car suspension. You might want to save some time and money and do what I did...check out the air suspension conversion kits at Strutmasters.com Those guys really helped me out. http://www.strutmasters.com/lincoln-town-car-suspension-s/37.htm Justin