I. Quick Check (Checking for Power and Pressure):
1. Safety First: Disconnect the negative battery cable before starting any work on the fuel system.
2. Listen for the Pump: Turn the ignition key to the "ON" position (don't crank the engine). You should hear the fuel pump run for a few seconds. This is a *prime* cycle. If you hear nothing, this is a strong indication of a failed pump or a problem in the power supply.
3. Check Fuel Pressure (Requires a Fuel Pressure Gauge): This is the most reliable quick test. You'll need a fuel pressure gauge that's compatible with the fuel system's pressure (check your Corvette's repair manual for the correct specification).
* Locate the fuel pressure test port (usually on the fuel rail). Consult your repair manual for the exact location.
* Connect the fuel pressure gauge to the test port.
* Turn the ignition key to the "ON" position. The gauge should show the correct fuel pressure specified in your manual. If the pressure is low or zero, it points towards a fuel pump issue. If the pressure is correct but the engine doesn't run, the problem likely lies elsewhere.
* Important: Once you've taken your reading, *carefully* relieve the pressure according to the gauge manufacturer's instructions to avoid injury.
II. More Thorough Diagnosis:
If the quick check reveals a problem, a more detailed investigation is needed:
1. Check the Fuel Pump Relay: Locate the fuel pump relay (your repair manual will show the location). You can swap it with a known good relay of the same type to rule out a relay problem.
2. Check the Fuel Pump Wiring: Inspect the wiring harness leading to the fuel pump for any breaks, chafing, or corrosion. Check the connectors for secure connections and corrosion. Use a multimeter to test for power at the pump's connector when the ignition is turned on.
3. Check the Fuel Pump Inertia Switch: This safety device cuts power to the fuel pump in the event of a collision. It's usually located under the dash or in the engine compartment (check your manual). Press the switch to reset it if it's tripped.
4. Check the Fuel Pump Fuse (if applicable): Consult your owner's manual for the fuel pump fuse location and rating.
5. Fuel Pump Voltage Test (Requires a Multimeter): With the ignition on, test the voltage at the fuel pump's connector. It should be close to the battery voltage (around 12V). If the voltage is significantly lower, this could indicate a wiring problem.
6. Fuel Pump Resistance Test (Requires a Multimeter): Disconnect the fuel pump connector. Measure the resistance across the fuel pump's terminals. Compare this to the specification listed in your repair manual. An open circuit (infinite resistance) or a short circuit (near zero resistance) indicates a faulty pump. Remember to disconnect the negative battery cable before doing this.
III. Replacing the Fuel Pump:
If all other checks point to the fuel pump as the culprit, you'll need to replace it. This usually involves dropping the fuel tank, which is a more involved procedure requiring special tools and care. Refer to your Corvette's repair manual for specific instructions.
Important Notes:
* Repair Manual: A factory service manual for your 1984 Corvette is essential for accurate diagnosis and repair. It will provide detailed diagrams, specifications, and procedures.
* Safety: Working with fuel systems requires caution. Always disconnect the negative battery cable, work in a well-ventilated area, and follow safety precautions.
* Professional Help: If you're not comfortable working on fuel systems, it's best to take your Corvette to a qualified mechanic. Incorrect repair can lead to serious consequences.
This information provides a general guideline. Always consult your vehicle's repair manual for the specific procedures and specifications for your 1984 Corvette.
