Here's why it's complex and what's involved:
* Location: The fuel filter is part of the fuel pump assembly, submerged in the fuel tank.
* Safety: Working with fuel is inherently dangerous. Fuel vapors are flammable and explosive. You'll need to relieve pressure from the fuel system before beginning.
* Specialized Tools: You'll need tools like fuel line disconnect tools, possibly a fuel tank strap wrench, and potentially a fuel pump removal tool. You'll also need jack stands, and possibly a fuel pump pressure gauge.
* Potential for Leaks: Disconnecting and reconnecting fuel lines carries a risk of leaks, which can cause significant problems.
If you're determined to attempt this yourself, you'll need a detailed repair manual specific to your 2005 Mustang's engine (V6 or V8). These manuals provide step-by-step instructions, safety precautions, and diagrams crucial for the job. Failure to follow these instructions precisely could result in injury or damage to your vehicle.
Here's a general outline (not a substitute for a repair manual):
1. Disconnect the battery negative terminal. This is a crucial safety step to prevent sparks.
2. Relieve fuel system pressure. Consult your repair manual for the correct procedure. This usually involves running the engine until it stalls after turning the key on for a few seconds.
3. Lower the fuel tank. This requires safely jacking up the car, supporting it with jack stands, removing the fuel tank straps and carefully lowering the tank. You'll likely need to disconnect fuel lines and possibly the fuel tank sending unit wiring.
4. Access the fuel pump assembly. Once the tank is lowered, you'll be able to access the fuel pump module.
5. Replace the fuel pump module (which contains the filter). This usually involves carefully removing the fuel pump assembly, replacing it with a new one, and reversing the process.
6. Reassemble everything. Reinstall the fuel tank, reconnect fuel lines (tighten securely!), reconnect the wiring, and lower the car.
7. Reconnect the battery negative terminal.
8. Check for leaks.
Again, I strongly recommend having a professional mechanic perform this repair. The potential risks and complexity make it a job better suited for experienced individuals with the proper tools and safety equipment.