You can replace the alternator on your 1989 Mercury Cougar by removing the alternator belt. Disconnect the wiring harness from the back of the alternator. Remove the alternator retaining bolts. Reverse the process to install the new alternator.
The fuel PCM on a 1989 Mercury Cougar is located above the gas tank. It is on the rear fender wall on the driver's side of the vehicle. The Fuel Pressure Control Module is another way to say fuel pump.
the fuel cap has a tiny hole ,to allow air into tank to replace fuel as it is used.if this hole is clogged, it will cause the tank to create a vaccuum and not allow fuel to move out of tank.either find the small hole and try to unplug it or buy a new fuel cap
follow your fuel lines and find filter hold the fuel lines make sure to not break or crimp line and use a wrench to remove filter make sure there is no flames anywhere near cause there is gas in the filter
There is a lot of of Internet shops where you can find an extensive line of spare parts for cars and buy them at the attractive price. If you have no idea about that you can also ask some professional as for instance mechanic or go to the scrap yard.
I've found no other way but to remove the doghouse and get it from there, but check the breather filter while you have the thing apart and replace it too. If the filter is not that old you can reach in from the engine area and remove the cover and turn the filter a quarter turn instead of replacing
The fuel filter is a black cylinder that has a rubber hose coming straight out the bottom and curved when going in the top. It is smaller than a soda can and is bolted to the wall furthest from the front fender under the hood and is in the vicinity of the batter.
If it is anything like mine, I had to drop the fuel tank in order to get to my fuel filter. I'm not for sure if that is the way it was built or if someone messed that part up. Definitely check around the gas tank though.