After driving my Windstar approximately 30 miles or more when I stop and get out I can smell gas. I see no leaks or any gas build up any where. Is there something that maybe is causing too much fuel to be going to the injectors??? which probably would also be tied in with some of the smog equipment.
You could have an injector leak. Have a mechanic use an emissions tester probe (the one they usually stick in the tailpipe) to sniff around the engine compartment with the engine running. The probe will sense gas vapor as unburned hyddrocarbon and should be able to pin down which injector is leaking. Or wherever the leak source is if not an injector.