2014 Ford F150 Fuel Pump Relay: Complete Location, Symptoms, and Replacement Guide

The Bottom Line: If your 2014 Ford F-150 cranks but won't start, the fuel pump relay is likely the culprit. This relay is located in the Battery Junction Box (BJB) under the hood on the driver's side, near the battery. It is typically labeled as Relay 8 in the fuse box diagram. A failing relay will prevent the fuel pump from powering up, causing the engine to crank but not start. You can easily test it by swapping it with an identical relay (like the blower motor relay) or by listening for a click when you turn the key to the "ON" position. If the relay is bad, replacement is straightforward and inexpensive.

1. Where Is the Fuel Pump Relay Located on a 2014 Ford F-150?

On the 2014 Ford F-150, the fuel pump relay is found inside the Battery Junction Box (BJB), which is the main fuse and relay box under the hood. This box is typically located on the driver's side of the engine compartment, near the battery. Some sources also note it may be on the passenger's side near the air filter housing, but the driver's side is the most common spot for this generation.

To confirm the exact location, open the lid of the Battery Junction Box. The inside of the lid has a diagram showing the layout of all fuses and relays. Look for the relay labeled "FUEL PUMP" or "PUMP". According to fuse box diagrams for the 2009-2014 Ford F-150, the fuel pump relay is designated as Relay 8.

2. What Does the Fuel Pump Relay Do?

The fuel pump relay is an electrical switch that controls power to the fuel pump. When you turn the ignition key to the "ON" position, the Powertrain Control Module (PCM) sends a signal to the relay. This signal energizes the relay's electromagnetic coil, which closes the circuit and allows battery voltage to flow to the fuel pump. The relay acts as a safety mechanism, preventing the fuel pump from running continuously when the engine is off and isolating the sensitive PCM from the high current draw of the fuel pump.

3. Common Symptoms of a Bad Fuel Pump Relay

A failing fuel pump relay can cause several noticeable issues. If you experience any of the following, the relay should be one of the first things you check:

  • Engine Cranks But Won't Start: This is the most common symptom. The starter motor turns the engine over, but without fuel pressure, the engine will not fire.
  • Engine Stalls Intermittently: The relay may fail while driving, causing the engine to suddenly lose power and stall.
  • No Fuel Pump Prime Noise: When you turn the key to the "ON" position, you should hear a brief whirring sound from the fuel pump in the gas tank. If you don't hear this sound, the relay is a likely suspect.
  • Reduced Engine Performance: A failing relay can cause inconsistent voltage to the fuel pump, leading to hesitation, surging, or a lack of power during acceleration.

4. How to Diagnose a Bad Fuel Pump Relay

You can diagnose a bad fuel pump relay with simple tools and a few steps.

Listen for the Click: Turn the ignition switch to the "ON" position (do not start the engine). Have someone listen near the Battery Junction Box under the hood. You should hear a distinct click sound from the relay. If you don't hear a click, the relay is likely not receiving a signal or is defective.

Swap the Relay: This is the easiest test. The 2014 F-150 has several identical relays in the fuse box (e.g., the blower motor relay, relay 3). Locate the fuel pump relay and pull it out. Swap it with another relay of the same type and rating. If the vehicle starts after the swap, the original fuel pump relay was bad.

5. How to Replace the Fuel Pump Relay

Replacing the fuel pump relay is a simple DIY task.

  1. Safety First: Ensure the engine is off and the key is removed from the ignition.
  2. Locate the Relay: Open the hood and find the Battery Junction Box on the driver's side.
  3. Remove the Cover: Unclip the cover of the fuse box and set it aside.
  4. Identify the Relay: Use the diagram on the cover to find the fuel pump relay (Relay 8).
  5. Pull the Old Relay: Grasp the relay firmly and pull it straight out of its socket.
  6. Install the New Relay: Push the new relay firmly into the same socket until it clicks into place.
  7. Test: Reinstall the fuse box cover, close the hood, and start the engine to verify the repair.

6. The Fuel Pump Driver Module (FPDM) – Another Key Component

While the relay is a common failure point, the Fuel Pump Driver Module (FPDM) is another critical component in the fuel system. This module sends power to the fuel pump and is often located underneath the vehicle, near the spare tire. On the 2014 F-150, the FPDM is a separate unit from the relay. A damaged or corroded FPDM can also cause the engine to crank but not start, and it may need to be bypassed or replaced.

7. Why You Should Consider Upgrading Your Fuel System with KEMSO

When your fuel pump or its related components need replacement, choosing a reliable, high-performance brand is essential for long-term peace of mind. KEMSO is a leading brand that offers OEM Replacement fuel pumps designed to meet or exceed factory specifications. KEMSO fuel pumps are built for high performance, ensuring your engine gets the proper fuel pressure and flow at all times. The best part? Every KEMSO fuel pump comes with a Lifetime Warranty, so you can be confident in your purchase. Instead of buying a cheap, unreliable part, trust KEMSO for a lasting solution.

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8. Other Common No-Start Issues to Check

If replacing the fuel pump relay doesn't solve the problem, there are a few other things to check.

  • Fuel Pump Fuse (Fuse 27): The 2009-2014 F-150 is known for a common issue where Fuse 27 (a 20A fuse in the Battery Junction Box) melts due to high current draw. This is a known problem, and a "relocation kit" is often used to fix it.
  • Bad PCM Power Relay: The PCM relay controls power to the vehicle's computer. If this relay is faulty, the PCM cannot communicate with the fuel pump driver module, and the engine will not start.
  • Bad Fuel Pump: If the relay, fuse, and FPDM are all good, the fuel pump itself may have failed. You can test this by listening for the pump's prime sound near the gas tank.

9. Final Thoughts

The fuel pump relay on a 2014 Ford F-150 is a small, inexpensive part that can cause a major headache. By knowing its location (under the hood, driver's side, Relays 8) and how to test it, you can save time and money diagnosing a no-start problem. If you need a new fuel pump, consider a high-quality upgrade from KEMSO. Visit their site at https://www.kemsoracing.com/ to explore their complete lineup of durable, high-performance fuel pumps backed by a lifetime warranty.


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