How to replace the fuel filter on a 1968 Ford Mustang GT Fastback (Bullitt)?

Content verified by Michael G.
July 18, 2025
Discover how to replace the fuel filter on your 1968 Ford Mustang GT Fastback (Bullitt) with simple, step-by-step instructions. Keep your classic ride running smoothly.

Replacing the fuel filter on a 1968 Ford Mustang GT Fastback (Bullitt) is an essential maintenance task to ensure the engine receives clean fuel, which is crucial for optimal performance. Dirty fuel filters can lead to a myriad of problems such as poor engine performance, reduced fuel efficiency, and even engine stalling. You can identify a problematic fuel filter if you experience these symptoms or notice debris in the fuel during regular checks. Here is how to solve this issue:

Step 1: Gather Necessary Tools and Materials

Before starting, make sure you have the necessary tools and materials:

  • A new fuel filter compatible with the 1968 Ford Mustang GT Fastback
  • Screwdrivers
  • Wrenches
  • Rags or a small bucket (for fuel spillage)
  • Safety gloves and goggles

Step 2: Ensure Safety

Safety is paramount. Begin by parking the car on a flat surface and turning off the engine. Disconnect the negative battery cable to prevent any electrical sparks. Wear safety gloves and goggles to protect yourself from fuel splashing.

Step 3: Locate the Fuel Filter

The fuel filter on the 1968 Mustang GT Fastback is typically located along the fuel line, near the carburetor. To locate it, open the hood and look at the engine bay. The fuel filter is usually a small, cylindrical component connected to the fuel line, often transparent or metallic, allowing you to see the fuel passing through.

Step 4: Relieve Fuel System Pressure

Before removing the fuel filter, you need to relieve the fuel system pressure to avoid fuel spraying out. To do this, carefully open the fuel cap located at the rear of the vehicle to release any built-up pressure in the fuel tank.

Step 5: Disconnect the Fuel Lines

Use the appropriate wrenches to loosen the clamps or bolts securing the fuel lines to the old filter. Place a rag or small bucket underneath to catch any spilled fuel. Carefully pull the fuel lines off the filter. Be gentle to avoid damaging the fuel lines.

Step 6: Remove the Old Fuel Filter

Once the fuel lines are disconnected, you can remove the old filter. Unscrew any mounting brackets or clamps holding the filter in place using a screwdriver or wrench. Note the orientation of the filter to ensure correct installation of the new one.

Step 7: Install the New Fuel Filter

Take the new fuel filter and position it in the same orientation as the old one. Attach it to the mounting brackets or clamps, and secure it tightly. Reconnect the fuel lines to the new filter, making sure they are firmly in place and sealed properly.

Step 8: Check for Leaks and Reconnect the Battery

After installing the new filter, double-check all connections for tightness. Reconnect the negative battery cable and start the engine to check for any leaks. Let the engine run for a few minutes and inspect the fuel filter area for signs of fuel leakage.

Step 9: Test Drive

Once you are confident there are no leaks, take the car for a short test drive. Monitor the engine performance to ensure that the fuel filter replacement resolved any previous issues.

By following these steps, you can effectively replace the fuel filter on your 1968 Ford Mustang GT Fastback, ensuring your vehicle runs smoothly and efficiently.

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