Here's a general outline. This is not a complete guide and should not be considered a substitute for a professional repair manual specific to your vehicle's year and engine. A repair manual will provide detailed diagrams, torque specifications, and crucial safety information.
1. Preparation:
* Safety First: Disconnect the negative battery terminal.
* Gather Tools: You'll need various sockets, wrenches, screwdrivers (possibly including a Torx set), jack stands, jack, fuel line disconnect tools, safety glasses, gloves, and possibly a fuel pressure gauge.
* Obtain Parts: Get the correct fuel pump for your vehicle's engine. You'll likely need new fuel filter(s) and possibly new fuel lines/clamps depending on their condition.
* Consult a Repair Manual: This is absolutely critical. The exact location and access points vary, and incorrect procedures can damage your car.
2. Accessing the Fuel Pump:
* Location: The fuel pump is typically located inside the fuel tank. You will almost certainly need to drop the fuel tank to access it. Your repair manual will show you exactly how to do this. It usually involves:
* Removing the fuel filler neck (possibly).
* Disconnecting the fuel lines (carefully!).
* Unbolting the tank straps and lowering the tank. You'll probably need a helper and/or jack stands for this.
* Consider Fuel Tank Safety: Fuel tanks can be heavy and awkward to handle; take necessary precautions. Also, ensure the fuel level is low in the tank to reduce the amount of fuel you're dealing with.
3. Fuel Pump Replacement:
* Disconnect Electrical Connections: Once the tank is lowered, you'll need to disconnect the fuel pump's electrical connector(s).
* Remove the Fuel Pump Assembly: This usually involves removing retaining clips, bolts, or a retaining ring. The pump is often housed in a module with the sender unit (which measures fuel level) attached. Keep track of how everything goes together for reassembly.
* Install the New Fuel Pump Assembly: Carefully install the new assembly, ensuring all connections are secure.
* Reconnect Electrical Connections: Reconnect the electrical connectors.
* Reinstall Fuel Tank: Securely reinstall the fuel tank and reconnect all fuel lines. Double-check all connections to prevent leaks.
4. Final Steps:
* Reconnect Battery: Reconnect the negative battery terminal.
* Check for Leaks: Check all fuel lines and connections for leaks.
* Prime the System: You might need to prime the fuel system (consult your repair manual) to get fuel flowing to the engine.
* Start the Engine: Start the engine and check for proper operation. Listen for any unusual noises and check for leaks.
Again, this is a simplified overview. Replacing a fuel pump is not a beginner's job, and mistakes can be costly (and potentially dangerous). If you're not comfortable with this type of repair, take your vehicle to a qualified mechanic. Using a repair manual specific to your 1985 Chrysler Fifth Avenue is essential for success and safety.
