Here's a general outline. Specifics will vary depending on whether you have a mechanical or electric fuel pump. You'll need a repair manual specific to your 1974 Oldsmobile Delta 88 for detailed instructions and diagrams. These manuals are available online and at auto parts stores.
I. Mechanical Fuel Pump (More common for this year):
1. Drain the fuel tank: This is crucial to prevent fuel spills. You'll need to siphon the gas out carefully into approved containers.
2. Access the fuel pump: This usually involves dropping the fuel tank. This requires removing the fuel tank straps, fuel lines, and possibly the exhaust system (at least partially). Consult your repair manual for the exact procedure.
3. Disconnect the fuel lines: Carefully disconnect the fuel lines from the pump. Have rags ready to absorb any remaining fuel.
4. Remove the pump: This usually involves removing bolts or clamps securing the pump to the engine block or fuel pump mounting block.
5. Install the new pump: Carefully install the new pump, ensuring it's properly seated and aligned.
6. Reconnect the fuel lines: Reconnect the fuel lines securely, ensuring there are no leaks. Use new fuel line clamps if needed.
7. Reinstall the fuel tank: Carefully reinstall the fuel tank and secure it with the straps.
8. Reconnect the battery: Reconnect the battery's negative terminal.
9. Prime the fuel system: This might involve manually pumping the fuel pump lever (if equipped) or using a priming tool to get fuel flowing to the carburetor.
10. Check for leaks: Carefully inspect all fuel connections for leaks.
11. Start the engine: Start the engine and check for proper fuel pressure.
II. Electric Fuel Pump (Less common, but possible for a later model or conversion):
1. Drain the fuel tank: As above.
2. Access the fuel pump: The location varies depending on the installation. It might be in the tank, on the frame rail, or in the engine bay. The repair manual is essential here.
3. Disconnect the electrical connections: Disconnect the electrical connector to the pump.
4. Disconnect the fuel lines: Disconnect the inlet and outlet fuel lines. Have rags ready.
5. Remove the pump: Carefully remove the pump following the instructions in your repair manual.
6. Install the new pump: Install the new pump, paying close attention to the orientation of the pump and the direction of fuel flow.
7. Reconnect the fuel lines: Reconnect the fuel lines securely, using new clamps if necessary.
8. Reconnect the electrical connection: Connect the electrical connector to the pump.
9. Reconnect the battery: Reconnect the battery's negative terminal.
10. Prime the fuel system (if necessary): Some electric pumps require priming. Consult the pump's instructions.
11. Check for leaks: Carefully inspect for fuel leaks.
12. Check fuel pressure: Use a fuel pressure gauge to ensure the pump is delivering the correct pressure.
13. Start the engine: Start the engine and check for proper operation.
Important Considerations:
* Repair Manual: A factory service manual for your specific year and model is indispensable.
* Fuel Pressure: Knowing the correct fuel pressure for your engine is crucial. This information is in your repair manual.
* Safety: Work in a well-ventilated area, away from open flames. Wear safety glasses.
* Tools: You'll need basic hand tools, possibly a fuel pump wrench, and possibly a fuel pressure gauge.
This is a general guide. Always consult your repair manual for the specific procedures and torque specifications for your 1974 Oldsmobile Delta 88. If you're not comfortable performing this repair yourself, take your car to a qualified mechanic. Improperly installed fuel pumps can lead to serious problems, including fire.
