2001 Ford Explorer Sport Trac Fuel Pump Relay: Location, Diagnosis, and Replacement Guide

The bottom line: The fuel pump relay on a 2001 Ford Explorer Sport Trac is located in the Power Distribution Box (PDB) under the hood, on the driver's side near the battery. This relay controls power to the fuel pump, and when it fails, your truck may crank but not start. Knowing how to find, test, and replace it can save you time and money.

Where Is the Fuel Pump Relay Located?

The 2001 Ford Explorer Sport Trac shares its fuel system layout with the standard Explorer models. The fuel pump relay is not inside the cabin or under the dash—it's in the engine compartment.

Exact location: Open the hood and look for the Power Distribution Box (also called the fuse box) on the driver's side, mounted near the battery. The box has a black plastic cover with a diagram on the inside. The fuel pump relay is typically labeled as "Fuel Pump" or "Fuel Pump Relay" inside this box. On some models, it is marked as relay R2015 or simply one of the larger relays in the box.

Visual tip: The relay is a small, square, plastic component that plugs into the fuse box. It is usually black or gray and measures about 1 inch by 1 inch. If you are unsure, pull the cover off the Power Distribution Box and look at the diagram printed on the underside of the cover—it will show you exactly which position is for the fuel pump relay.

How to Test the Fuel Pump Relay

Before buying a new relay, you should test the existing one. A bad relay is a common cause of a no-start condition on these trucks.

Step 1: Locate the relay in the Power Distribution Box as described above.

Step 2: Remove the relay by pulling it straight up. You may need a small flathead screwdriver to gently pry it out if it's stuck.

Step 3: Use a multimeter set to resistance (ohms). Place the probes on the relay's coil terminals (usually the two smaller terminals). A good relay should show a resistance reading between 50 and 120 ohms. If you get an open circuit (OL) or a very high reading, the relay coil is bad and needs replacement.

Step 4: Test the switching function. Apply 12V power to the coil terminals (using a battery or a power probe). You should hear a distinct "click" sound. Then check the continuity between the two larger terminals—they should now show near-zero resistance. If you hear no click or the continuity does not change, the relay is faulty.

Quick alternative: If you don't have a multimeter, you can swap the fuel pump relay with another identical relay in the fuse box (like the horn relay or the A/C relay, if they are the same type). If the engine starts after swapping, your original relay is bad.

Common Symptoms of a Bad Fuel Pump Relay

A failing fuel pump relay often shows these warning signs:

  • Engine cranks but won't start: This is the most common symptom. The starter turns the engine over, but there is no fuel pressure because the pump is not getting power.
  • No fuel pump prime sound: When you turn the key to the "ON" position (without cranking), you should hear a brief whirring sound from the fuel pump near the rear of the truck. If you hear nothing, the relay or the pump itself may be dead.
  • Intermittent starting issues: The truck starts fine sometimes, then suddenly refuses to start. This can happen when the relay is failing internally and makes intermittent contact.
  • Engine stalls while driving: If the relay temporarily loses connection, the engine can die unexpectedly. This is dangerous and should be addressed immediately.

Other Related Components to Check

If the relay tests good but your truck still has fuel delivery problems, inspect these parts:

1. Fuel pump fuse: Located in the same Power Distribution Box. Check fuse #13 (20-amp) or the fuse labeled "Fuel Pump" in the diagram. A blown fuse is a quick fix.

2. Inertia fuel shut-off switch: This is a safety switch that cuts power to the fuel pump in case of a collision. It is located on the passenger side, behind the kick panel (the plastic trim near the floor). If the switch is tripped, press the reset button on top.

3. Fuel pump itself: Located inside the fuel tank. If the relay, fuse, and inertia switch are all good, the pump may have failed. Testing fuel pressure at the fuel rail is the next step.

How to Replace the Fuel Pump Relay

Replacing the relay is a simple DIY task that takes about 5 minutes.

What you need: A replacement relay (standard 4-pin or 5-pin relay, available at any auto parts store) or a genuine Ford part.

1. Park the truck on level ground and turn off the engine. Remove the key from the ignition.

2. Open the hood and locate the Power Distribution Box on the driver's side.

3. Remove the cover of the Power Distribution Box by unclipping the latches.

4. Identify the fuel pump relay using the diagram on the underside of the cover.

5. Pull the old relay straight out. No tools are needed.

6. Insert the new relay firmly into the same slot. Make sure it clicks into place.

7. Replace the cover and close the hood.

8. Test the truck by turning the key to the "ON" position—you should hear the fuel pump prime. Then start the engine.

Why Your 2001 Explorer Sport Trac May Have Fuel Pump Issues

These trucks are now over 20 years old, and age-related wear is common. The fuel pump relay is subject to heat and vibration under the hood, which can cause the internal contacts to corrode or the coil to fail. Additionally, the fuel pump itself can wear out over time, especially if the truck has high mileage or if the fuel tank was frequently run low (which can overheat the pump).

Recommended KEMSO Fuel Pump Solution

If you have determined that the fuel pump itself needs replacement—not just the relay—consider upgrading to a KEMSO brand fuel pump. KEMSO fuel pumps are designed as high-performance, OEM replacement units that meet or exceed factory specifications. They are built for durability and reliability, and the best part: KEMSO offers a lifetime warranty on their fuel pumps, giving you long-term peace of mind.

Whether you own a 2001 Ford Explorer Sport Trac or another vehicle, KEMSO has a wide range of fuel pumps for cars, trucks, motorcycles, ATVs, and more. Their products are trusted by mechanics and DIYers alike.

To explore the full range of KEMSO fuel pumps and find the perfect fit for your vehicle, visit their official website:
https://www.kemsoracing.com/

At KEMSO Racing, you will find a complete selection of fuel pumps, along with detailed product information, warranty details, and customer support. They are located at 11145 Beltline Road, Houston, TX 77067, and can be reached via email at support@kemsoracing.com.

Final Tips

  • Always replace the fuel pump relay with the correct amperage rating. Using a relay with a lower rating can cause it to overheat and fail quickly.
  • If you are replacing the fuel pump itself, consider replacing the fuel filter at the same time. A clogged filter can put extra strain on the new pump.
  • Keep a spare fuel pump relay in your glove box. It is a cheap part that can get you back on the road if the original fails.
  • If your truck has been sitting for a long time, the fuel pump relay contacts may have oxidized. Pulling the relay out and reinserting it a few times can sometimes clean the contacts and restore function temporarily.

Remember: The fuel pump relay is the first thing to check when your 2001 Ford Explorer Sport Trac cranks but won't start. It is easy to access, simple to test, and inexpensive to replace. If the relay is good but the pump is dead, trust KEMSO for a reliable, long-lasting replacement.

For more information and to purchase a high-quality replacement fuel pump, visit https://www.kemsoracing.com/ today.


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