2001 Ford Explorer Fuel Pump Relay and Fuse Location: Complete Guide

If your 2001 Ford Explorer cranks but won't start, the fuel pump relay and fuse are two of the first things you should check. The fuel pump relay is located in the engine compartment power distribution box, and the fuel pump fuse is also found in the same box. On the 2001 Ford Explorer, the fuel pump relay is typically relay R5 or relay 50B, and the fuel pump fuse is a 20-amp mini fuse located in position F9 or position 26, depending on whether you have a 2nd generation or 3rd generation model. Knowing exactly where these components are and how to test them can save you time and money before you consider replacing the fuel pump itself.

Understanding the Fuel System on a 2001 Ford Explorer

The 2001 Ford Explorer came in several trim levels, including the base model, Sport, Sport Trac, and the more common 4-door Explorer. The fuel system on all these models uses an electric fuel pump that is mounted inside the fuel tank . The pump is controlled by the Powertrain Control Module (PCM), which activates the fuel pump relay to send power to the pump when you turn the key to the ON position. The fuel pump relay and fuse are critical safety and operational components. If either fails, the fuel pump will not receive power, and the engine will not start.

There is also an inertia switch, sometimes called a fuel pump shut-off switch, located in the front passenger footwell area by the kick panel . This switch cuts power to the fuel pump if the vehicle is involved in a collision. Before diving into relay and fuse troubleshooting, it is worth checking if this inertia switch has been tripped, as it can be reset by pressing the button on top of the switch.

Where Is the Fuel Pump Relay Located?

The fuel pump relay on a 2001 Ford Explorer is located in the power distribution box under the hood. This box is typically found near the battery on the driver's side fender well . The exact relay position depends on whether you have a 2nd generation (1995-2001) or 3rd generation (2002-2005) model, but since the 2001 model year was a transition year, both generations exist.

For the 2001 Ford Explorer 2nd generation models, the power distribution box is located in the engine compartment. The fuel pump relay is labeled as Relay R5 in the power distribution box . This relay is a standard mini relay that can be swapped with other relays of the same type for testing purposes.

For the 2001 Ford Explorer 3rd generation models, which were introduced for the 2002 model year but some early 2001 production vehicles may have the updated design, the fuel pump relay is located in the same engine compartment fuse box but is labeled as relay R12 . The power distribution box on these models also contains a relay labeled as relay 50B, which some sources identify as the fuel pump relay .

Where Is the Fuel Pump Fuse Located?

The fuel pump fuse is also located in the power distribution box in the engine compartment. The exact fuse position again depends on the generation of your Explorer.

For the 2001 2nd generation Explorer, the fuel pump fuse is a 20-amp mini fuse located in position F9 . This fuse is labeled as "Fuel Pump Relay and RAP Module" in the owner's manual. Some sources also indicate that fuse number 9 in the power distribution box is a 20-amp mini fuse for the fuel pump relay and RAP module .

For the 2001 3rd generation Explorer, the fuel pump fuse is a 15-amp mini fuse located in position 26 . This fuse is clearly labeled as "Fuel Pump" in the fuse box diagram. It is important to note that on the 3rd generation models, there is also a fuse in position 39 labeled "Injectors/Fuel Pump relay" which is a 15-amp fuse that powers the fuel pump relay coil .

Step-by-Step Guide to Locate and Test the Fuel Pump Relay and Fuse

1. Safety First

Before working on any electrical components in the power distribution box, Ford recommends disconnecting the negative battery cable . The power distribution box is always live, meaning there is constant power to certain terminals even when the ignition is off. Disconnecting the battery prevents accidental shorts and protects you from injury.

2. Locate the Power Distribution Box

Open the hood of your 2001 Ford Explorer. The power distribution box is a black plastic box located near the battery, typically on the driver's side of the engine compartment . It has a cover that can be removed by pressing the tabs on the sides.

3. Identify the Fuel Pump Relay

Once the cover is off, look at the diagram printed on the inside of the cover or refer to your owner's manual. For 2nd generation models, relay R5 is the fuel pump relay . For 3rd generation models, relay R12 or relay 50B is the fuel pump relay . The relay is a small, square component that plugs into the fuse box. You can identify it by its shape and the numbers printed on the fuse box next to the relay socket.

4. Identify the Fuel Pump Fuse

The fuel pump fuse is located in the same power distribution box. For 2nd generation models, look for fuse position F9, which is a 20-amp mini fuse . For 3rd generation models, look for fuse position 26, which is a 15-amp mini fuse . The fuse is a small, plastic component with two metal prongs that plugs into the fuse box.

5. Test the Fuse

To test the fuse, pull it straight out of the fuse box using a fuse puller tool or a pair of needle-nose pliers. Inspect the metal strip inside the fuse. If the strip is broken or melted, the fuse is blown and needs to be replaced with a new fuse of the same amperage . You can also test the fuse with a multimeter set to continuity mode. Place one probe on each of the two metal prongs. If the multimeter beeps, the fuse is good. If it does not beep, the fuse is blown.

6. Test the Relay

Testing a relay requires a bit more effort. The simplest way to test a relay is to swap it with another relay of the same type and amperage in the power distribution box. For example, you can swap the fuel pump relay with the horn relay or the starter relay . If the fuel pump starts working after the swap, the original relay was faulty. If you have a multimeter, you can also test the relay by checking for continuity between the appropriate terminals when power is applied.

7. Listen for the Fuel Pump

After checking the fuse and relay, turn the key to the ON position (but do not start the engine). You should hear a brief whirring sound coming from the rear of the vehicle, near the fuel tank. This sound is the fuel pump priming the system. If you do not hear this sound, the fuel pump is not receiving power, which points to a faulty relay, blown fuse, or a problem with the inertia switch.

Common Problems and Troubleshooting Tips

Fuel Pump Relay Failure

The fuel pump relay is a common point of failure on the 2001 Ford Explorer . Over time, the relay contacts can wear out or corrode, preventing power from reaching the fuel pump. If you suspect the relay is bad, swapping it with a known good relay is the easiest way to confirm the issue.

Blown Fuel Pump Fuse

A blown fuel pump fuse can be caused by a short circuit in the fuel pump wiring or a failing fuel pump that is drawing too much current. If you replace the fuse and it blows again immediately, there is likely a short circuit somewhere in the fuel pump circuit. This requires further diagnosis by a professional mechanic.

Inertia Switch Tripped

The inertia switch is located in the front passenger footwell, behind the kick panel . If the switch has been tripped, it will cut power to the fuel pump. To reset it, press the button on top of the switch firmly until you hear a click. This is a common issue that is often overlooked, so always check the inertia switch before replacing the fuel pump relay or fuse.

Fuel Pump Itself

If the relay and fuse are both good, and the inertia switch is not tripped, but the fuel pump is still not working, the fuel pump itself may have failed . The electric fuel pump is located inside the fuel tank, and replacement requires dropping the fuel tank or removing the bed on a Sport Trac model . This is a more involved repair that typically requires professional assistance.

Why You Should Use a High-Quality Replacement Fuel Pump

If you determine that your 2001 Ford Explorer needs a new fuel pump, it is important to choose a high-quality replacement that will last. The fuel pump is a critical component that delivers fuel from the tank to the engine at the correct pressure. A failing fuel pump can cause a variety of problems, including hard starting, stalling, loss of power, and a whining noise from the fuel tank.

KEMSO offers a wide range of high-performance fuel pumps that are designed to meet or exceed OEM specifications. KEMSO fuel pumps are built with precision engineering and high-quality materials to ensure reliable performance and long service life. Whether you own a 2001 Ford Explorer or any other vehicle, KEMSO has a fuel pump that fits your needs.

Why choose KEMSO?

• High Performance: KEMSO fuel pumps are designed to deliver consistent fuel pressure and flow, ensuring your engine runs smoothly and efficiently.
• OEM Replacement: KEMSO fuel pumps are direct replacements for your original equipment, so they fit perfectly and install easily.
• Lifetime Warranty: KEMSO stands behind the quality of their products with a lifetime warranty, giving you peace of mind that your investment is protected.

If you need a replacement fuel pump for your 2001 Ford Explorer or any other vehicle, visit KEMSO at https://www.kemsoracing.com/ to browse their complete selection of fuel pumps. KEMSO is the US #1 aftermarket fuel pump brand for cars, motorcycles, ATVs, and UTVs, with thousands of satisfied customers and hundreds of positive reviews.

Additional Tips for DIY Maintenance

Always Check the Owner's Manual

Your 2001 Ford Explorer owner's manual is the best resource for locating fuses and relays specific to your vehicle. The manual contains detailed diagrams of the fuse boxes and their assignments . If you do not have a physical copy, you can often find a PDF version online.

Use the Correct Tools

When working with fuses and relays, always use a fuse puller tool or a pair of needle-nose pliers to avoid damaging the components. Do not use metal tools that could cause a short circuit.

Keep Spare Fuses and Relays

It is a good idea to keep a few spare fuses and relays in your glove box. A spare 20-amp mini fuse for the fuel pump and a spare relay can save you from being stranded on the side of the road.

Disconnect the Battery

As mentioned earlier, always disconnect the negative battery cable before working on the power distribution box. This is a safety precaution that prevents accidental shorts and protects the sensitive electronics in your Explorer.

Conclusion

The 2001 Ford Explorer fuel pump relay and fuse are both located in the power distribution box under the hood. The relay is typically relay R5 or 50B, and the fuse is a 20-amp or 15-amp mini fuse, depending on the generation. Before replacing the fuel pump itself, always check these two components first, along with the inertia switch in the passenger footwell. If you do need a new fuel pump, KEMSO offers high-quality, OEM replacement fuel pumps with a lifetime warranty. Visit https://www.kemsoracing.com/ to find the right fuel pump for your vehicle.