Here's a breakdown of how to check your fuel pump:
1. Listen for the pump:
* Key On, Engine Off (KOEO): Turn the ignition key to the "ON" position (don't start the engine). You should hear a brief whirring sound from the fuel pump in the fuel tank. This usually lasts for a couple of seconds. If you don't hear anything, the pump may be faulty, the relay is bad, or there's a problem in the electrical circuit.
2. Check the Fuel Pump Relay:
* Locate the relay: Consult your owner's manual or an online repair manual to find the location of the fuel pump relay. It's usually in the under-hood fuse box. The relay itself will likely be labeled.
* Swap the relay: Find a relay of the same amperage rating (check the label) that controls something non-essential (like the wipers) and swap it with the fuel pump relay. If the pump now works, the problem is the relay itself. If not, the issue is likely elsewhere.
* Inspect the relay: Visually inspect the relay for any signs of damage, such as burnt contacts or a swollen casing.
3. Check the Fuel Pump Fuse (if applicable):
* Locate the fuse: Your owner's manual will show you the fuse box diagram. Find the fuel pump fuse and check if it's blown. Replace it with a new fuse of the same amperage if it's blown. If the fuse blows again immediately, there's a short circuit somewhere in the system.
4. Check Fuel Pressure (Advanced):
This requires a fuel pressure gauge. This is the most definitive test.
* Obtain a fuel pressure gauge: You'll need a gauge that's compatible with the fuel pressure of your Probe's system. A specialized tool is needed to connect to the fuel rail. Auto parts stores usually rent them.
* Connect the gauge: Follow the instructions that come with your fuel pressure gauge. Usually, you'll connect it to the schrader valve on the fuel rail.
* Check pressure: With the engine running, the gauge should show a reading within the manufacturer's specified range (consult your repair manual for the correct pressure). Low pressure indicates a problem with the fuel pump, filter, or pressure regulator.
5. Inspect the Wiring (Advanced):
* Trace the wiring: If the previous steps don't reveal a problem, check the wiring harness leading to the fuel pump for any damage, corrosion, or loose connections. This is often difficult and may require the removal of the fuel tank.
Important Considerations:
* Fuel Pump Replacement: If the fuel pump is faulty, replacing it is a significant job, often involving dropping the fuel tank. This is best left to experienced mechanics unless you're comfortable with fuel system work.
* Repair Manual: A repair manual specific to your 1993 Ford Probe is invaluable for detailed diagrams, specifications, and troubleshooting steps.
If you're not comfortable performing these checks yourself, it's best to take your Probe to a qualified mechanic for diagnosis and repair. Working with fuel systems involves flammable liquids and requires caution.
