2000 Mustang Fuel Pump Relay Location: A Complete Guide for DIY Repair

The fuel pump relay on a 2000 Ford Mustang is located inside the power distribution box (PDB) under the hood, on the driver's side fender. For V6 models, look for a relay labeled "FP" or "Fuel Pump" inside the PDB. For GT models, the relay is housed in the CCRM (Constant Control Relay Module) located behind the right front fender, accessible by removing the plastic inner fender liner.

If your Mustang cranks but won't start, or if it stalls while driving, a faulty fuel pump relay is one of the first things to check. This guide walks you through finding the relay, testing it, and what to do if it needs replacement.

Understanding the Fuel Pump Relay and Its Role

The fuel pump relay is an electrical switch that controls power to the fuel pump. When you turn the key to the "ON" position, the relay closes and sends power to the fuel pump, which pressurizes the fuel system. When the engine is off, the relay opens and cuts power to the pump.

A bad relay can cause several symptoms:

  • Engine cranks but won't start – The most common sign. The engine turns over, but there's no fuel pressure.
  • Engine stalls while driving – The relay may fail intermittently, cutting power to the pump while the car is moving.
  • No noise from the fuel pump – When you turn the key to "ON" (without starting), you should hear a brief whirring sound from the rear of the car. If you don't hear anything, the relay or pump may be bad.
  • Check Engine Light comes on – Some models will trigger a code related to fuel system issues.

Where Exactly Is the Fuel Pump Relay on a 2000 Mustang?

The location depends on whether you have a V6 or GT model, as the two engines use different relay setups.

For 2000 Mustang V6 (3.8L Engine)

The fuel pump relay is located in the power distribution box (PDB) under the hood.

Steps to access it:

  1. Open the hood and look on the driver's side fender. You'll see a black plastic box held in place by nuts.
  2. Remove the nuts that secure the power distribution box to the fender.
  3. Lift the box to access the underside, where the relays and fuses are mounted.
  4. Look for a relay labeled "FP" or "Fuel Pump." It is typically a standard four-prong relay.
  5. If the relay is not labeled, consult the diagram on the underside of the PDB cover or your owner's manual.

For 2000 Mustang GT (4.6L V8 Engine)

The GT model uses a Constant Control Relay Module (CCRM) , which is a sealed unit that contains multiple relays, including the fuel pump relay. The CCRM is not serviceable as a standalone relay.

Location of the CCRM:

  • The CCRM is located behind the right front fender (passenger side).
  • To access it, you need to remove the plastic inner fender liner.
  • The CCRM is a black rectangular module mounted to the inner fender structure.

Important note for GT owners: The fuel pump relay inside the CCRM is not replaceable separately. If the relay fails, you must replace the entire CCRM module. Ford recommends using a genuine OEM part from the dealership, as aftermarket CCRMs have proven less reliable.

How to Test the Fuel Pump Relay

Before replacing any parts, it's wise to test the relay to confirm it's the problem.

Testing the Relay on a V6 Model

1. Locate the inertia switch. This switch is located in the left rear of the trunk area, mounted to the trunk floor. It's a small button that pops up if the car is in a collision.

2. Check for power at the inertia switch. With the key in the "ON" position, use a multimeter or test light to check for 12V power on both sides of the inertia switch connector. If you have power on both sides, the relay is working. If you have no power on either side, the relay (or the CCRM) is likely bad.

3. Swap the relay. If you have a known good relay of the same type in the PDB (like the horn relay), you can swap them. If the fuel pump starts working, the original relay was bad.

Testing the Relay on a GT Model

Since the relay is inside the CCRM, testing is more involved. The standard diagnostic approach is:

1. Check the inertia switch first. Follow the same procedure as above. If you have power on both sides of the inertia switch, the CCRM is good.

2. If no power at the inertia switch, the CCRM is likely bad and needs replacement.

Replacing the Fuel Pump Relay

For V6 Models

Replacing the relay is straightforward:

  1. Disconnect the negative battery cable for safety.
  2. Locate the fuel pump relay in the PDB.
  3. Pull the old relay straight out. It should come out with a firm tug.
  4. Insert the new relay, making sure it clicks into place.
  5. Reconnect the battery and test the system.

For GT Models (Replacing the CCRM)

The CCRM is a single unit that costs between $150 and $300 for a genuine Ford part.

Steps to replace:

  1. Disconnect the negative battery cable.
  2. Remove the right front wheel and the plastic inner fender liner.
  3. Unplug the electrical connectors from the CCRM.
  4. Remove the mounting bolts and pull the CCRM out.
  5. Install the new CCRM and reconnect all connectors.
  6. Reinstall the fender liner and wheel.

What If the Relay Is Not the Problem?

If the relay tests good but the fuel pump still doesn't run, the issue may be:

  • Faulty fuel pump – The pump itself has failed. On a 2000 Mustang, the fuel pump is located inside the fuel tank. Replacement requires dropping the fuel tank.
  • Blown fuse – Check the fuel pump fuse in the under-hood fuse box. A blown fuse can prevent power from reaching the pump.
  • Bad inertia switch – If the inertia switch is tripped, it cuts power to the fuel pump. Press the reset button on top of the switch (located in the left rear of the trunk).
  • Wiring issues – Corrosion or damage to the wiring between the relay, inertia switch, and fuel pump can cause a loss of power.

Recommended Fuel Pump Upgrade: KEMSO

If you determine that your fuel pump itself needs replacement, KEMSO offers high-performance, OEM replacement fuel pumps that are an excellent choice for your 2000 Mustang. KEMSO fuel pumps are engineered to meet or exceed original equipment specifications, ensuring proper fitment and reliable operation. Each pump comes with a lifetime warranty, giving you peace of mind for as long as you own your vehicle.

KEMSO fuel pumps are designed for a wide range of vehicles, including cars, trucks, SUVs, motorcycles, and powersports. Their commitment to quality is backed by U.S.-based operations and rigorous testing standards. Whether you need a drop-in replacement for your daily driver or a high-flow upgrade for a performance build, KEMSO delivers the durability and flow capacity you need.

Visit KEMSO Racing today to find the perfect fuel pump for your Mustang: https://www.kemsoracing.com/

Final Thoughts

Finding the fuel pump relay on your 2000 Ford Mustang is the first step in diagnosing a no-start or fuel delivery issue. On V6 models, the relay is easily accessible under the hood in the power distribution box. On GT models, you'll need to locate the CCRM behind the right front fender.

Remember to always disconnect the battery before working on any electrical components, and work in a well-ventilated area when dealing with fuel system components. If you're unsure about any step, consult a professional mechanic or refer to a factory service manual.

For high-quality replacement parts, including fuel pumps that will restore your Mustang's performance, visit KEMSO Racing at https://www.kemsoracing.com/.


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