Before you begin:
* Safety First: Disconnect the negative battery terminal. Work in a well-ventilated area, away from open flames or sparks. Use proper safety glasses and gloves. Have a fire extinguisher readily available.
* Gather Tools and Parts: You'll need a jack, jack stands (crucial for safety!), socket wrenches (various sizes), a fuel line disconnect tool (very helpful), a fuel pump pliers (sometimes needed for stubborn clamps), a new fuel pump assembly (ensure it's the correct one for your car's engine – V6 2.3L or 2.5L), new fuel filter (it's a good idea to replace this at the same time), rags, shop towels, and possibly a torque wrench. Consult your repair manual for the specific torque specifications.
* Consult a Repair Manual: A Haynes or Chilton repair manual specific to your 1999 Mazda Millenia is highly recommended. It will provide detailed diagrams, torque specifications, and step-by-step instructions. This is not something to attempt without a good reference.
* Fuel Pressure Relief: There's usually a way to relieve fuel pressure in the system, typically by cycling the ignition switch several times. Your repair manual will detail this procedure. This reduces the risk of fuel spraying when you disconnect the lines.
General Steps (This is a *simplified* overview. Refer to your repair manual for precise details and diagrams):
1. Preparation: Jack up the car securely and support it on jack stands. Locate the fuel pump access panel, usually under the rear seat or in the trunk. Consult your manual for the exact location.
2. Access the Fuel Pump: Remove the access panel. You might need to remove some interior trim pieces.
3. Disconnect Fuel Lines and Electrical Connections: Carefully disconnect the fuel lines using the fuel line disconnect tool. Be prepared for some fuel spillage – use rags to absorb it. Disconnect the electrical connectors to the fuel pump.
4. Remove the Fuel Pump Assembly: This often involves removing a retaining ring or bolts holding the pump assembly in place. The assembly may be held by a retaining ring, bolts, or a combination. The assembly is usually within the fuel tank itself, and you'll need to carefully extract it. This part can be tricky and might require specific tools.
5. Install New Fuel Pump Assembly: Carefully install the new fuel pump assembly, ensuring everything is securely seated.
6. Reconnect Fuel Lines and Electrical Connections: Reconnect the fuel lines and electrical connectors, ensuring a tight seal.
7. Reassemble: Reinstall the access panel and any interior trim pieces you removed.
8. Lower Vehicle: Carefully lower the vehicle from the jack stands.
9. Check for Leaks: Start the engine and check for fuel leaks around the fuel lines and connections.
10. Test Drive: Take the car for a test drive to ensure the fuel pump is working correctly.
Important Considerations:
* Fuel Tank Removal: In some cases, removing the fuel tank entirely might be necessary to access the fuel pump. This is a more involved process and requires additional steps.
* Professional Help: If you're not comfortable working on your car or lack the necessary tools and experience, it's best to take your vehicle to a qualified mechanic. Improperly working on the fuel system is dangerous.
This is a general outline. Always consult your repair manual for the specific steps and safety precautions relevant to your 1999 Mazda Millenia. Improper repair could lead to serious injury or damage to your vehicle. If you are unsure about any step, consult a professional.
