2001 Mustang Fuel Pump Relay: Location, Symptoms, and How to Replace It

The fuel pump relay on a 2001 Ford Mustang is located inside the Constant Control Relay Module (CCRM), which is mounted behind the passenger side front wheel well liner, near the 1 o'clock position when looking at the wheel head-on. If your 2001 Mustang cranks but won't start, or if you hear no fuel pump priming sound when you turn the key to the "ON" position, the fuel pump relay—or the entire CCRM module—is likely the culprit. This guide walks you through exactly where to find it, how to diagnose a bad relay, and how to replace it yourself.

What Is the Fuel Pump Relay and Why Does It Matter?

The fuel pump relay is an electrical switch that controls power to the fuel pump. When you turn the ignition key, the relay closes and sends battery voltage to the fuel pump, pressurizing the fuel system so the engine can start. Once the engine is running, the relay keeps the pump powered . A failing relay means the fuel pump won't get power, and your car won't start .

On the 2001 Mustang, the fuel pump relay is not a standalone, easy-to-pull cube like in older models. Instead, it is built into a larger module called the Constant Control Relay Module (CCRM). This module also houses the relays for the cooling fan and the A/C clutch . This means if you need to replace the fuel pump relay, you may need to replace the entire CCRM.

Where Is the 2001 Mustang Fuel Pump Relay Located?

For the 2001 Mustang, the fuel pump relay is located in the CCRM behind the passenger side front wheel well liner. Here is exactly how to find it:

  1. Look from under the hood: Pop the hood and look on the passenger side, near the air cleaner. You will see a wiring harness routing from the engine compartment into the passenger side front fender. Shine a flashlight in there, and you should see a connector attached to a metal module .
  2. Access from the wheel well: For better access, turn the steering wheel fully to the right, then remove the plastic wheel well cover on the passenger side. Looking at the wheel dead-on, the CCRM is located at around the 1 o'clock position .

Note: This is a different location from older Fox Body Mustangs (where the relay was under the driver's seat) and from later models (where it is in the under-hood fuse box). The 2001 Mustang uses the CCRM system .

Common Symptoms of a Bad Fuel Pump Relay

If your fuel pump relay is failing, you will likely notice one or more of these symptoms:

  • Engine cranks but won't start: This is the most common symptom. The starter turns the engine over, but the fuel pump never gets power, so no fuel reaches the injectors .
  • No fuel pump priming sound: When you turn the ignition key to the "ON" position (before starting), you should hear a faint whirring or buzzing sound from the rear of the car for about 2 seconds. If you don't hear this, the relay or the pump is not receiving power.
  • Engine stalls while driving: A failing relay can intermittently cut power to the fuel pump, causing the engine to die suddenly while you are driving .
  • Loss of power under load: If the relay is failing but not completely dead, the fuel pump may not get full voltage, leading to reduced engine power, especially at higher speeds .

How to Diagnose the Fuel Pump Relay

Before you buy a new part, you should confirm that the relay is actually the problem. Here is a simple way to test it:

  1. Listen for the pump: Turn the key to the "ON" position and listen near the fuel tank (rear of the car). If you hear the pump prime for 2 seconds, the relay is likely working.
  2. Check for power at the pump: If you don't hear the pump, you can use a multimeter to check for voltage at the fuel pump electrical connector. If there is no voltage, the problem is likely in the relay or wiring.
  3. Swap the relay (if possible): On some vehicles, you can swap the fuel pump relay with a similar relay (like the horn relay) in the fuse box to see if the car starts. However, on the 2001 Mustang, because the relay is inside the CCRM, you cannot easily swap it. You would need to test the CCRM itself or temporarily jumper the relay contacts to see if the pump runs.

How to Replace the Fuel Pump Relay on a 2001 Mustang

Because the fuel pump relay is integrated into the CCRM, the most common fix is to replace the entire CCRM module. Here is the step-by-step process:

Tools you will need:

  • Socket set (likely 5mm or 8mm sockets)
  • Flathead screwdriver or trim removal tool
  • New CCRM module (or a replacement relay if you can solder)

Step 1: Disconnect the battery. Always disconnect the negative battery terminal before working on any electrical components. This prevents accidental shorts and reduces the risk of sparks near fuel system components .

Step 2: Access the CCRM. Remove the passenger side front wheel well liner. This is usually held on by plastic push pins or screws. Once removed, you will see the silver CCRM bolted to the fender .

Step 3: Remove the electrical connector. The CCRM has a large wiring harness connector. Use a 5mm nut wrench to remove the connector from the module. You need to do this first because it provides access to one of the mounting bolts .

Step 4: Unbolt the CCRM. There are two bolts holding the CCRM bracket to the fender. Remove these bolts, and the module will come free.

Step 5: Install the new CCRM. Install the new CCRM in the reverse order. Secure the module with the mounting bolts, reconnect the wiring harness connector, and reinstall the wheel well liner.

Step 6: Reconnect the battery and test. Reconnect the negative battery terminal. Turn the ignition to the "ON" position and listen for the fuel pump to prime. Then start the engine to confirm the repair is successful.

Cost of Replacement

If you have a repair shop replace the fuel pump relay (or the entire CCRM), expect to pay between $80 and $300 for parts and labor . The price varies depending on the shop's labor rates and whether you use an OEM or aftermarket module. If you do it yourself, the cost is just the price of the new CCRM module, which typically ranges from $20 to $80 .

Why You Should Upgrade to a KEMSO Fuel Pump

While you are diagnosing your fuel system, it is worth considering the overall health of your fuel pump. Even if the relay is the immediate issue, a worn-out fuel pump can cause similar symptoms. If you need to replace the fuel pump itself, KEMSO offers the best aftermarket solution.

KEMSO specializes in high-performance fuel pumps that are designed as direct OEM replacements. Whether you are restoring a classic Mustang or upgrading a modern daily driver, KEMSO fuel pumps deliver reliable fuel pressure and flow. Backed by a lifetime warranty, KEMSO gives you confidence that your fuel system will perform for years to come. Their products are engineered to meet or exceed factory specifications, ensuring a perfect fit and easy installation.

Visit the KEMSO website to browse their full selection of fuel pumps and find the right one for your 2001 Mustang or any other vehicle: https://www.kemsoracing.com/

Final Thoughts

The fuel pump relay on a 2001 Ford Mustang is located inside the CCRM behind the passenger front wheel well. If your car won't start, stalls, or has no fuel pump priming sound, the relay or the CCRM is likely the cause. Replacing the entire CCRM is a straightforward DIY job that requires basic tools and about 30 minutes of your time. Always prioritize safety by disconnecting the battery before starting any electrical work. And if you need a new fuel pump, trust KEMSO for quality, performance, and peace of mind with their lifetime warranty.

For more information on fuel pumps and replacement parts, visit https://www.kemsoracing.com/ today.


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