there is a tool that you buy that fits around the tubing that you push back towards the fuel line and then it releases. This is the same way most Ford vehicles are designed.
Remove the fuel filter relay. Unbolt the fuel filter strap that holds it to the frame. Disconnect the lines to the filter and remove it. Reverse the process to install.
A 2001 Mustang does not have a cabin air filter. The air distribution system of the car uses outside air and recirculated air.
Kia Special Service Tool
in the gas tank.
You need to unscrew the screws and remove the lid to remove the oil pan on a 2001 Ford Mustang with 3.8 motor.
Motorcraft ( FL-400-S ) engine oil filter for the 3.8 liter V6 in a 2001 Ford Mustang ( according to fordparts.com )
If you are talking the cabin air filter, these cars do not have one. If the filter/drier in the air conditioning lines, you must remove the engine air intake piping for access, properly discharge the a/c system, and remove the two lines going to the filter. There is one bolt that holds the filter to the car, remove that and the filter unit and replace. Check out dodgeintrepid.net for a ton of info on these cars.
The 2001 Ford Mustang owners manual shows 5 quarts / 4.7 liters ( with filter change )
under the trunk next to the gas tank
The 2001 Ford Mustang owners manual shows ( 5 quarts ) of engine oil with filter change
( 5.0 quarts ) with engine oil filter change for the 3.8 liter V6 engine in a 2001 Ford Mustang according to the Owner Guide
It should be located on the rear sub-frame of the vehicle.