2017 Ford Explorer Fuel Pump Relay – Location, Troubleshooting
The 2017 Ford Explorer fuel pump relay is a critical electronic component that bridges the gap between your ignition system and the fuel pump. If this component fails, your vehicle will crank but refuse to start, or it may stall unexpectedly while driving due to a lack of fuel pressure.
We have all experienced that sinking feeling when you turn the key or press the start button and nothing happens. It is a common frustration for many SUV owners, but the solution is often simpler than a total fuel pump replacement. This guide will help you master the 2017 ford explorer fuel pump relay system so you can diagnose the issue without an expensive trip to the dealership.
I will walk you through the exact location of the relay, the symptoms of failure, and the step-by-step testing process. Whether you are in your garage or stuck on a remote trail, these practical insights will give you the confidence to handle the repair safely. Let us dive into the mechanics of your Explorer’s fuel delivery system.
Understanding the Role of the 2017 Ford Explorer Fuel Pump Relay
The 2017 ford explorer fuel pump relay acts as a high-current switch controlled by the Powertrain Control Module (PCM). When you turn the ignition to the “on” position, the PCM sends a low-current signal to the relay coil. This creates a magnetic field that closes the internal contacts, allowing high-current electricity to flow directly to the fuel pump.
This design protects your sensitive ignition switch and PCM from the high amperage required to run the fuel pump. In modern vehicles like the Explorer, this system has become more complex. While older vehicles used a simple mechanical relay, the 2017 model often utilizes a Fuel Pump Driver Module (FPDM) to vary the pump speed based on engine demand.
Understanding this distinction is vital for troubleshooting. If the relay or the driver module fails, the fuel pump stays dormant. Without that initial “prime” of fuel, the combustion chambers remain dry, and your engine stays silent. Identifying a relay failure early can save you from replacing a perfectly healthy, and much more expensive, fuel pump.
Where to Find the 2017 Ford Explorer Fuel Pump Relay
Locating the 2017 ford explorer fuel pump relay can be slightly confusing because Ford moved toward integrated power distribution. In many 2017 Explorer configurations, the traditional “plug-and-play” relay is not a standalone unit in the engine bay box. Instead, the fuel pump power is often managed by a non-serviceable relay soldered onto the circuit board of the Battery Junction Box.
However, you should first check the Battery Junction Box located under the hood on the driver’s side. Look for Fuse 27 (a 20-amp fuse), which provides the primary power for the fuel pump circuit. If this fuse is blown, the relay cannot send power to the pump regardless of its condition. Always inspect the underside of the fuse box cover for the specific layout diagram for your trim level.
If your vehicle uses the Fuel Pump Driver Module instead of a traditional relay, you will find it hidden in the rear of the vehicle. It is typically located under the second-row seat or behind the interior trim panels near the rear cargo area. This module performs the “relay” function by switching power to the pump as commanded by the vehicle’s computer.
Accessing the Engine Compartment Fuse Box
- Pop the hood and locate the black plastic box near the battery.
- Release the plastic tabs on the side of the cover to lift it off.
- Refer to the legend inside the lid to identify the fuel pump power fuse.
Locating the Fuel Pump Driver Module
- Fold down the rear passenger seats to inspect the floor area.
- Look for a small rectangular plastic module bolted to the floor pan or frame.
- Check the wiring harness for signs of corrosion or loose connections.
Common Symptoms of a Faulty Fuel Pump Relay
Identifying a failing 2017 ford explorer fuel pump relay requires a keen ear and a bit of observation. The most obvious sign is an engine that cranks vigorously but never actually fires up. This happens because the starter is turning the engine, but the fuel injectors have no pressurized fuel to spray into the cylinders.
Another common symptom is an intermittent stall. You might be driving at highway speeds when the engine suddenly dies as if you turned off the key. This often points to internal heat buildup within the relay or module. When the components get hot, the internal contacts may warp and lose connection, cutting off the fuel supply instantly.
Listen for the “fuel pump prime” when you first turn the ignition to the “on” position without starting the engine. You should hear a faint humming sound coming from the rear of the vehicle for about two seconds. If you hear total silence, the relay is likely not sending power to the pump, or the pump itself has failed.
How to Test the 2017 Ford Explorer Fuel Pump Relay System
Before you spend money on new parts, testing the 2017 ford explorer fuel pump relay circuit is a smart move. You will need a basic 12-volt test light or a digital multimeter. Safety is paramount here; ensure you are working in a well-ventilated area and away from open flames, as you are dealing with the fuel system’s electrical supply.
Start by checking the fuel pump fuse (Fuse 27) in the engine bay. Use your multimeter to check for continuity across the fuse. If the fuse is intact, move to the fuel pump driver module in the rear. Unplug the connector and check for power at the input pin while an assistant cycles the ignition key.
If you have power going into the module but nothing coming out to the pump, the module (acting as your relay) is defective. If there is no power reaching the module, the issue lies further up the chain, potentially in the Battery Junction Box or the PCM wiring harness. This systematic approach prevents the common “parts cannon” mistake of replacing items blindly.
Using the “Swap Test” Method
If your Explorer uses a traditional removable relay in the fuse box, find another relay with the exact same part number. Often, the horn or cooling fan relays are identical. Swap them temporarily to see if the vehicle starts. If the engine fires up with the horn relay installed, you have confirmed a bad fuel pump relay.
Voltage Drop Testing
For a more advanced check, perform a voltage drop test on the fuel pump circuit. High resistance caused by corroded wires can mimic a relay failure. Ensure the ground wire for the fuel pump driver module is clean and securely fastened to the vehicle’s chassis to maintain a steady current flow.
Step-by-Step Replacement of the Fuel Pump Driver Module
Since the 2017 ford explorer fuel pump relay function is often handled by the driver module, replacing this unit is the most common fix. This is a beginner-friendly DIY task that requires only basic hand tools. Most owners can complete this job in under 30 minutes once the part is located.
- Disconnect the Battery: Always remove the negative battery terminal to prevent short circuits.
- Clear the Area: Remove the rear floor mats or fold the seats to gain clear access to the module.
- Unplug the Harness: Press the release tab on the electrical connector and pull it away from the module.
- Remove Mounting Bolts: Use a socket wrench (usually 8mm or 10mm) to remove the bolts holding the module to the floor.
- Install New Module: Bolt the new unit in place, ensuring it sits flush against the mounting surface.
- Reconnect and Test: Plug the harness back in, reconnect the battery, and listen for the fuel pump prime.
When purchasing a replacement, ensure you get an OEM-equivalent part. Cheap aftermarket modules can sometimes struggle with the heat and vibration of off-road driving or towing. A high-quality module ensures that your fuel pressure remains consistent under heavy engine loads.
Safety Precautions and Expert Tips for DIYers
Working on the 2017 ford explorer fuel pump relay system involves electrical components and proximity to fuel vapors. Always wear safety glasses to protect your eyes from debris. If you are working in the rear of the vehicle near the fuel tank, ensure there are no sparks or heat sources nearby that could ignite lingering fumes.
One “pro tip” for off-roaders is to carry a spare fuel pump driver module in your recovery kit. These modules are known to fail due to moisture or extreme vibrations on rough trails. Having a spare can mean the difference between a quick 10-minute fix and a very expensive tow from the middle of nowhere.
If you find that your fuses keep blowing immediately after replacement, do not install a larger fuse. This indicates a short circuit or a seizing fuel pump that is drawing too much current. Installing a larger fuse can melt the wiring harness or even cause a vehicle fire. In this scenario, it is time to consult a professional technician.
Frequently Asked Questions About 2017 Ford Explorer Fuel Pump Relay
Where is the 2017 ford explorer fuel pump relay fuse located?
The primary fuse for the fuel pump is located in the engine compartment fuse box (Battery Junction Box). It is typically Fuse 27, which is a 20-amp yellow fuse. Always verify this with the diagram printed on the inside of your fuse box cover, as configurations can vary by engine type.
Can a bad relay cause my Explorer to lose power while driving?
Yes, a failing relay or driver module can cause intermittent power loss. If the internal contacts are worn, they may vibrate loose or overheat, causing the fuel pump to shut off momentarily. This results in a jerking sensation or a complete engine stall while the vehicle is in motion.
Why does my fuel pump relay click but the car won’t start?
A clicking sound indicates that the relay coil is receiving a signal and attempting to close. However, the internal contacts may be burnt or corroded, preventing the high-current electricity from passing through. Alternatively, the relay may be fine, but the fuel pump itself is seized and cannot spin.
Is there a reset button for the fuel pump on a 2017 Explorer?
Unlike older Ford models that had a physical inertia switch (red button), the 2017 Ford Explorer uses the Restraints Control Module to cut fuel in the event of a crash. If the fuel has been cut due to an impact, the system usually needs to be reset using a diagnostic scan tool or by cycling the ignition in a specific sequence.
Final Thoughts on Maintaining Your Fuel System
Mastering the 2017 ford explorer fuel pump relay and its associated modules is an essential skill for any DIY mechanic or long-distance traveler. By knowing where to look and how to test the circuit, you take control of your vehicle’s reliability. Most fuel delivery issues start with these small electrical components rather than the pump itself.
Always prioritize diagnostic testing before buying expensive parts. A simple multimeter check can reveal a blown fuse or a loose ground wire that costs nothing to fix. Keeping your electrical connections clean and dry will extend the life of your relay system and keep your Explorer running smoothly for years to come.
Stay safe, keep your tools handy, and enjoy the peace of mind that comes with knowing your vehicle inside and out. Whether you are commuting to work or exploring a mountain pass, a healthy fuel system is your ticket to a successful journey!
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