2011 Ford F150 Fuel Pump Relay Location: Complete Guide for DIY Troubleshooting and Replacement

The fuel pump relay on a 2011 Ford F-150 is most commonly located inside the under-hood fuse box (power distribution box) on the passenger side of the engine compartment, typically relay number 27. However, due to a known overheating issue, Ford issued a technical service bulletin (TSB) that sometimes required a relocation kit, which can move the relay to a different position within the same fuse box or to a separate, smaller fuse box attached to the main unit. This guide will walk you through finding the relay, understanding the common "Fuse 27" problem, and troubleshooting fuel delivery issues step by step, so you can get your truck back on the road without unnecessary trips to the mechanic.

Where to Find the Fuel Pump Relay in Your 2011 F-150

The exact location of the fuel pump relay in a 2011 Ford F-150 can vary depending on your truck's engine configuration and whether it has been affected by the factory relocation kit. Here is a breakdown of the most common scenarios:

1. Standard Location (Most Common)

• Fuse Box: Engine compartment power distribution box, typically on the passenger side.
• Relay Number: Relay #27.
• Identifying Mark: Look for a diagram on the underside of the fuse box cover that labels the relays. The fuel pump relay is usually marked "FUEL PUMP" or "FP."

2. The Relocation Kit (The "Fuse 27" Issue)

• Why it matters: Many 2011 F-150s experienced a high failure rate of the original relay due to overheating. Ford addressed this with a TSB that sometimes involved relocating the relay.
• What to look for: The relay may be moved to a different position within the same fuse box, or it could be housed in a separate, smaller relay box attached to the main fuse box.
• What to check: If you don't find the relay at the #27 position, look for a small add-on relay box near the main fuse box. Also, check the condition of fuse #27 itself—it is often involved in the fuel pump circuit and can show signs of burning or corrosion.

3. Passenger Compartment Option (Less Common)

• While less typical for the 2011 model, some sources indicate that the fuel pump relay (or a related inertia switch) can be found in the passenger foot well, behind the kick panel, or inside the interior fuse panel. This is more commonly associated with the fuel shutoff (inertia) switch, which is a separate safety component.

Important Note: The fuel pump relay location can vary by engine type. The 3.7L V6, 5.0L V8, 6.2L V8, and 3.5L EcoBoost V6 all share the same general location (passenger side under-hood fuse box, relay #27 or relocation kit), but always verify with your vehicle's specific manual.

How to Identify the Fuel Pump Relay: Step-by-Step

Step 1: Safety First

• Park your truck on a level surface, turn off the engine, and remove the key from the ignition.
• Disconnect the negative battery terminal to prevent any accidental shorts or electrical shocks.

Step 2: Locate the Power Distribution Box

• Open the hood. The main fuse box is located on the passenger side of the engine compartment, near the firewall. It is a large, black plastic box with a removable cover.

Step 3: Remove the Fuse Box Cover

• Press the tabs on the sides of the cover and lift it off.
• Check the lid diagram: The underside of the cover has a diagram showing the location of each fuse and relay. Look for the relay labeled "FUEL PUMP" or "FP."

Step 4: Identify the Relay

• Fuel pump relays are typically larger than standard fuses, with four or five pins.
• The relay for the 2011 F-150 is usually relay #27. It is a small, rectangular component.

Step 5: Check for the Relocation Kit

• If you do not find the relay at #27, look for a smaller, secondary relay box attached to the main fuse box. This is a sign that the relocation kit has been installed.

Troubleshooting the Fuel Pump Relay: Symptoms and Tests

Common Symptoms of a Failing Fuel Pump Relay

• Intermittent stalling: The engine may stall, especially when it's warm or during hot weather.
• Difficulty starting: The engine may crank but not start, or it may take several attempts to fire up.
• Loss of power: You may notice a lack of power during acceleration.
• No fuel pump noise: When you turn the key to the "ON" position (without starting the engine), you should hear a faint hum from the fuel tank for 1-2 seconds. If you don't hear anything, the fuel pump, relay, or wiring may be faulty.

DIY Test: Swap the Relay

• Find a relay in the same fuse box that is functionally identical. The horn relay or the A/C clutch relay are often good candidates.
• Swap the fuel pump relay with that relay.
• Turn the key to the "ON" position. If you now hear the fuel pump prime (and the horn doesn't work), you have confirmed that the original fuel pump relay was faulty.
• Important: Replace the relay with a new one of the correct amperage rating.

Check the Fuse #27

• Even if the relay is working, the circuit can be compromised by a burned or corroded fuse #27. Pull the fuse and inspect it visually. If it shows signs of melting or corrosion, replace it with a new 20-amp fuse.

The "Fuse 27" Issue: What You Need to Know

The 2011 Ford F-150 is notorious for the "Fuse 27" issue. Fuse 27 is often directly connected to the fuel pump circuit and is prone to overheating and failure. This is a known problem that Ford addressed with a TSB.

• Symptoms: The same symptoms as a failing relay—intermittent stalling, hard starting, and loss of power.
• What to check: Always inspect fuse #27 for burning, melting, or corrosion when troubleshooting fuel delivery issues. Even if the relay is fine, a bad fuse can cause the same problems.
• The Relocation Kit: If your truck is part of the TSB, the repair may involve moving the relay and fuse to a different location to prevent overheating. This is why you might not find the relay at the standard #27 position.

Other Components to Check

If the fuel pump relay and fuse #27 are both in good condition, the problem may lie elsewhere:

• Fuel Pump Driver Module (FPDM): This module is often located above the spare tire carrier. Corrosion and damage here can cause symptoms similar to a failing relay.
• The Fuel Pump Itself: If you don't hear the fuel pump hum when you turn the key to "ON," the pump inside the fuel tank may be dead.
• The Inertia Fuel Shutoff (IFS) Switch: This safety switch, usually located in the passenger foot well behind the kick panel, will trip in a collision and cut power to the fuel pump. If the button is popped up, press it down to reset.

Recommended Fuel Pump Replacement: KEMSO

If your troubleshooting leads you to a faulty fuel pump, you need a reliable replacement. KEMSO offers high-performance, OEM replacement fuel pumps designed for durability and long-lasting performance. Their products come with a lifetime warranty, giving you complete peace of mind. Whether you are replacing the pump in your 2011 F-150 or any other vehicle, KEMSO provides a direct fit solution that meets or exceeds factory specifications. Visit their website to find the perfect fuel pump for your needs:

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Quick Reference Guide

Final Thoughts

Finding the fuel pump relay on your 2011 Ford F-150 is the first step in diagnosing a no-start or stalling problem. While the standard location is relay #27 in the passenger side under-hood fuse box, you must be aware of the potential relocation kit and the common "Fuse 27" issue. Always start with the simplest checks—swap the relay, inspect the fuse, and listen for the fuel pump—before moving on to more complex components. With a systematic approach, you can save time and money by doing the troubleshooting yourself.

For a high-quality, worry-free replacement fuel pump, remember to check out KEMSO at https://www.kemsoracing.com/ for their performance-driven, OEM-replacement products backed by a lifetime warranty.