To troubleshoot no power at the fuel pump, you'll need a wiring diagram for your specific year and model Corvette. Without one, tracing the circuit will be difficult and potentially damaging. These diagrams show which fuses and relays are involved and how the circuit is wired. You can often find these diagrams online through Corvette forums or restoration sites dedicated to that year.
Here's a general troubleshooting approach, but remember to disconnect the negative battery terminal before starting any electrical work:
1. Check the Fuel Pump Relay: Locate the fuel pump relay (its location varies by year but is usually in the underhood fuse box). Swap it with a known good relay of the same type to see if that resolves the problem. A simple test is to check for continuity across the relay's contacts with a multimeter.
2. Check the Fuel Pump Inertia Switch: The inertia switch is a safety device that cuts power to the fuel pump in a collision. It's usually located under the dash or in the engine compartment. Reset it (usually by pushing a button) and check if power is restored.
3. Check Fuses: Check all fuses related to the fuel system in the underhood fuse box. Your wiring diagram will tell you which fuses are involved, but it's likely the ones labeled ignition or fuel system related. Look for blown fuses (broken filaments inside).
4. Check Power at the Fuel Pump Relay: Use a test light or multimeter to check for power at the input and output terminals of the fuel pump relay. This will help determine if the problem is before or after the relay.
5. Check the Wiring: Visually inspect the wiring leading to and from the fuel pump for any damage, corrosion, or loose connections. This is the most tedious part, and a wiring diagram is crucial.
6. Check the Fuel Pump Itself: If power is getting to the pump but it's not working, the pump itself could be faulty and may need replacing.
Important Note: Working on fuel systems involves flammable materials. Take precautions to avoid sparks or flames. If you are not comfortable working with automotive electrical systems, it's best to take your Corvette to a qualified mechanic.
