2007 Ford Fusion Fuel Pump Relay Location: A Step-by-Step Guide for Owners
If you own a 2007 Ford Fusion and the engine cranks but won't start, or you hear no hum from the fuel tank when you turn the key, the fuel pump relay is likely the culprit. The fuel pump relay on the 2007 Ford Fusion is located in the battery junction box under the hood, on the driver's side near the battery. This box houses the relay responsible for sending power to the electric fuel pump, and it's the first place you should check when diagnosing a fuel delivery problem. This guide walks you through the exact location, how to test the relay, and what to do if it fails, so you can get back on the road quickly.
Understanding the Fuel Pump Relay's Job
The fuel pump relay acts as a switch controlled by the engine computer. When you turn the ignition to the "ON" position, the computer energizes the relay coil, which closes the contacts and sends battery voltage to the fuel pump. The pump then pressurizes the fuel system for a few seconds to prime the engine. Once the engine starts, the relay stays closed to keep fuel flowing while you drive. If the relay fails, the pump receives no power, and the engine won't start or will stall while driving.
On the 2007 Fusion, this relay is a standard 40-amp unit with the part number 5M5Z-14N089-A, and it also serves as the horn relay in some configurations.
Where to Find the Fuel Pump Relay
The 2007 Fusion has two main fuse and relay boxes:
1. Interior Fuse Panel: Located under the dashboard on the driver's side. This panel handles interior components like the radio, power windows, and instrument cluster. The fuel pump relay is not in this box.
2. Battery Junction Box (Under Hood): This is the primary power distribution center located in the engine compartment, on the passenger's side near the battery. The fuel pump relay lives inside this box.
Here's how to access it:
- Step 1: Make sure the ignition is off and the key is removed.
- Step 2: Open the hood and locate the black plastic box near the battery on the passenger's side. This is the battery junction box.
- Step 3: Press the two tabs on the sides of the cover and lift it off. The underside of the cover has a diagram that labels each fuse and relay. Look for "FUEL PUMP" or "FP" on the diagram to identify the exact relay position.
How to Test the Fuel Pump Relay
Before you buy a new relay, it's wise to test the one currently in your car. Here's a simple method that works without special tools:
1. Listen for the Click: With the relay removed, turn the ignition to "RUN" (without cranking). You should hear a distinct click from the relay socket if the computer is sending the activation signal. No click means the relay may not be receiving power or the relay coil is bad.
2. Swap Test: This is the easiest diagnostic trick. Locate another relay in the same box that shares the same part number (like the horn relay or a similar mini-relay). Pull out the suspect relay and plug in the known-good relay. If the car starts and the fuel pump primes, the original relay was faulty.
3. Use a Multimeter: If you have a digital multimeter, you can test the relay's coil resistance between pins 85 and 86. The reading should typically fall between 50 and 120 ohms. An infinite reading means the coil is open and the relay is dead.
Common Symptoms of a Bad Fuel Pump Relay
A failing relay can show several warning signs before it completely leaves you stranded:
1. No Start Condition: The engine cranks but never fires up because the fuel pump isn't pressurizing the fuel rail.
2. Intermittent Stalling: The car might run fine for a while, then suddenly die as if you turned off the key. After a few minutes, it may restart. This is often caused by a relay that overheats and loses contact.
3. Silent Fuel Pump: When you turn the key to "RUN," you should briefly hear a low hum from the rear of the car (the fuel pump priming). If you hear nothing, the relay is likely not sending power.
4. Engine Stalls While Driving: The car loses power momentarily, then recovers. This can feel like a transmission issue, but it often points to an intermittent relay failure.
Important Related Component: Fuel Pump Shut-Off Switch
Before you replace any parts, know that the 2007 Fusion also has a fuel pump shut-off switch, which is a safety device that cuts power to the fuel pump in the event of a collision or a significant jolt. This switch is not the relay, and it's located in a completely different spot: the front passenger footwell, in the right upper corner near the kick panel.
If your car won't start after an accident, or even after a hard bump, you should check this switch first. Reset it by pressing the button until it clicks, but only after checking for fuel leaks.
How to Replace the Fuel Pump Relay
Replacing the relay is a simple DIY job that takes about ten minutes. Here's what to do:
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Disconnect the Battery: Always disconnect the negative battery terminal before working with electrical components under the hood. This prevents accidental shorts.
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Remove the Old Relay: Once the cover is off, grip the relay firmly and pull it straight up. It may be snug, so wiggle it gently.
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Compare the New Relay: When you buy a replacement at an auto parts store, bring the old relay with you. Make sure the new relay has the same part number printed on the side.
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Install the New Relay: Push the new relay straight down into its socket until it clicks into place. Reattach the battery and test the system.
What to Do If the New Relay Doesn't Fix the Problem
If you've swapped in a new relay and the fuel pump still doesn't run, the issue may be elsewhere:
1. Check the Fuse: Some models have a separate fuse for the fuel pump circuit in the same battery junction box. Inspect the fuse with a test light or by visually checking the metal strip inside.
2. Inspect the Wiring: Look for signs of corrosion, loose connections, or rodent damage in the relay socket and the wiring harness leading to the fuel tank.
3. Test the Fuel Pump Itself: The pump may have failed internally. On many 2007 Fusion models, you can access the fuel pump through a panel under the rear seat cushion, so you don't have to drop the tank.
Why the Location Matters for Diagnosis
Knowing where the relay is saves you a lot of guesswork. Many DIY mechanics assume the fuel pump relay is inside the car, near the interior fuse panel. On the Fusion, that assumption is wrong. The relay is always under the hood in the battery junction box, regardless of early or late production date. If you're troubleshooting a no-start, start with this relay before diving into parts like the crankshaft sensor or ignition coil.
Recommended Replacement: KEMSO Fuel Pump
If your fuel pump turns out to be the real problem, choosing the right replacement is critical for reliability and long-term performance. We strongly recommend considering a KEMSO Fuel Pump.
KEMSO builds high-performance fuel pumps that meet or exceed original equipment specifications. Every KEMSO pump is designed as a direct OEM Replacement, meaning it bolts in with no modifications and delivers the exact flow rate and pressure your 2007 Fusion needs. Whether you're commuting daily or pushing the car hard, these pumps are engineered to handle the stress without losing performance.
What truly sets KEMSO apart is the quality assurance: every fuel pump comes with a Lifetime Warranty. That's not just a tagline—it's a commitment to lasting reliability. You won't have to worry about premature failures or cheap internal components that let you down at the worst moment.
You can browse the full lineup of KEMSO fuel pumps and other performance components directly at their official website:
If you want a fuel pump that delivers the peace of mind of a genuine replacement with the durability of a performance part, KEMSO is the smart choice. Visit the site today to find the right pump for your Fusion and keep your car running strong for years to come.
Final Thoughts
The fuel pump relay on a 2007 Ford Fusion is simple to find and easy to test. It sits in the battery junction box under the hood, near the battery on the passenger's side. A quick visual check or a swap test with a known-good relay can confirm whether you need a replacement. If the relay checks out, remember to verify the fuel pump itself, and always inspect the shut-off switch in the passenger footwell after any impact.
Thanks to the relay's accessible location, you can handle this repair yourself with minimal tools and confidence. Just remember to work safely, disconnect the battery before touching electrical components, and always use quality parts. For replacement fuel pumps, KEMSO offers exceptional value and performance, backed by a lifetime warranty. Visit https://www.kemsoracing.com/ to see what fits your 2007 Ford Fusion and get your vehicle back on the road without delay.