Repair Guide: 1991 Ford Mustang Fuel Pump Replacement
This comprehensive repair guide is aimed at experienced mechanics with the purpose of assisting with a less typical repair task - a Fuel Pump Replacement for a 1991 Ford Mustang.
Tools Required
- Jack and jack stands
- Fuel line disconnect tool
- Screwdriver set
- Socket set
- Drain pan
- Hammer and punch
Overview of Problem
Over time, the fuel pump can become faulty leading to inferior car performance. Symptoms can include prolonged engine cranking times, decreased fuel efficiency, or even engine stalling.
Diagnostic Steps
- Check for the presence of power at the fuel pump. Connect the positive lead of a test light to power, and the negative lead to the appropriate fuel pump fuse. If the test light does not illuminate, there may be a problem with the fuse or relay.
- Monitor the fuel pressure using a fuel pressure gauge. Low pressure can indicate a damaged pump.
Repair Guide
- Relieve the fuel system pressure.
- Raise and safely support the vehicle.
- Remove the fuel tank from the vehicle, making sure to disconnect everything attached to it such as fuel lines and electrical connectors. Use a drain pan to catch any dripping fuel.
- Remove the lock ring from the top of the fuel tank, preferably using a hammer and punch. This will allow you to access the fuel pump.
- Remove the old fuel pump and replace it with the new one. Ensure the new pump is correctly positioned with the float pointing downwards.
- Reinstall the lock ring, then reinstall the fuel tank, reconnecting all lines and connectors.
- Refill the tank with fuel, reconnect the negative battery terminal and turn the key to the 'on' position for a few seconds before starting the engine. This will prime the lines with fuel.
Potential Pitfalls
Removing the fuel tank can be messy, and excessive force can damage the fuel tank or components. It's also important to ensure all connectors are securely tightened.
Critical Success Tips
To ensure a successful repair, work safely and cleanly. Double-check all connections and ensure the new fuel pump is correctly positioned. Always make sure to handle all fuel safely.