RE: constantly smelling gas fumes?
Look at the gas tank inside the rear wheels and see if is looks like it is stained from the gas.
If so then one of the vent hoses on the top of the tank might be cracked.
If not check next to the fuel filter there is a little Valve with 2 vaccum lines called a rollover valve see if one of those hoses cracked.
1987 Ford mustang LX Coupe 5.0
1995 Yellow T5-RM running
1996 850 turbo
1994 N/A 5-speed wagon Purple (daughters)