1. Consult your Owner's Manual: This is the first and best resource. Your owner's manual should have a fuse and relay diagram specifying the fuel pump relay's location.
2. Common Locations: The relay is likely located in one of these areas:
* Under the Hood in the Fuse/Relay Box: The most common location. The fuse box is usually near the battery or firewall. Look for a labeled diagram on the fuse box cover itself. Many 1980s cars used a numbered system, and the fuel pump relay would be listed there, often in close proximity to the fuses for the fuel system (if any exist).
* Under the Dash (less likely): While less common for this specific component, some electrical relays might be found in a secondary box under the dash.
3. Visual Identification: The relay itself is usually a small square or rectangular component with several terminals. It might be labelled, though this isn't guaranteed. You'll likely need to compare it to your owner's manual's diagram or a wiring diagram for your specific Corvette year and engine.
4. Testing the Relay (Requires a Multimeter):
* Visual Inspection: First, visually inspect the relay for any signs of damage, corrosion, or loose connections.
* Continuity Test (Using a Multimeter): With the relay removed from its socket, set your multimeter to the continuity setting (usually a diode symbol or a bell).
* Contacts 30 and 87: Test the continuity between terminals 30 and 87. If the relay is good, you should get a continuity reading.
* Contacts 85 and 86: Test the continuity between terminals 85 and 86. You *should not* get continuity in this test. This shows the coil is not shorted.
* Resistance Test (Using a Multimeter): Measure the resistance across terminals 85 and 86. You should have some resistance (a value, not zero or infinity). The exact value isn't critical, but a high resistance (approaching infinity) or zero resistance suggests a problem. Refer to a wiring diagram if you can find a spec for the resistance.
* Voltage Test (Using a Multimeter): With the ignition switched on, test voltage at terminals 85 and 86. You should see battery voltage on at least one of these terminals. This test verifies the control circuit is supplying power to the relay.
Important Notes:
* Safety First: Disconnect the negative battery terminal before starting any electrical work.
* Wiring Diagrams: A wiring diagram specific to your 1986 Corvette (available online or from a repair manual) is invaluable for accurate identification and testing. These diagrams usually show the relay's location and its connections in the circuit.
* Professional Help: If you're not comfortable working with automotive electrical systems, it's best to take your Corvette to a qualified mechanic. Improper testing can damage other components.
Remember, the specific location and labeling of the fuel pump relay may vary slightly. Using your owner's manual and possibly a wiring diagram specific to your Corvette's VIN is crucial for accurate identification.
