2007 Dodge Charger 3.5 Fuel Pump Relay Location: A Complete Owner’s Guide

If you own a 2007 Dodge Charger with the 3.5L V6 engine and you are chasing a no-start condition, a dead fuel pump, or intermittent stalling, here is the direct answer you need: the fuel pump relay for your Charger is located inside the rear power distribution center, which sits in the trunk on the right side near the spare tire well. This is not in the engine bay, and it is not in the interior kick panel. Many owners waste time looking under the hood first, but on this model, the fuel pump relay lives in the rear fuse box, often labeled as fuse/relay number 6 with a 20-amp rating . Understanding exactly where this relay is, how to test it, and what to do when it fails can save you hours of frustration and a costly tow bill. This guide walks you through the location, the symptoms of a failing relay, how to replace it, and what to do if the problem persists.

Why the Fuel Pump Relay Matters on Your 2007 Charger

The fuel pump relay is a small but critical electrical switch that controls power delivery to the fuel pump. When you turn the key to the ON position, the Powertrain Control Module (PCM) activates this relay, which then sends battery voltage to the fuel pump located inside the fuel tank. Without a functioning relay, the pump never receives power, the fuel rail stays empty, and the engine will crank but refuse to start .

On the 2007 Dodge Charger 3.5L, the fuel system is designed to maintain a constant pressure of approximately 58 psi plus or minus 5 psi at the fuel rail . The relay is the gatekeeper for that pressure. If the relay contacts wear out, overheat, or fail internally, you will experience symptoms ranging from hard starting to a complete no-start condition. Because the relay is an electro-mechanical component, it can also fail intermittently, which makes diagnosing the issue more challenging.

Finding the Fuel Pump Relay: Step-by-Step

The 2007 Dodge Charger has two primary fuse boxes: the under-hood Totally Integrated Power Module (TIPM) and the rear power distribution center located in the trunk . Many owners assume the fuel pump relay is in the engine bay because that is where most domestic vehicles place it. However, Dodge engineers chose a different approach for this model.

To access the fuel pump relay, follow these steps:

  1. Open the trunk and clear out any cargo, spare tire covers, or floor mats that may be in the way.
  2. Lift the trunk floor liner to expose the spare tire well and the fuse box located nearby .
  3. Locate the rear power distribution center. It is a black plastic box, typically mounted on the right rear side of the trunk, near the battery .
  4. Remove the fuse box cover by releasing the latches or pressing the tabs. The underside of the cover has a printed diagram showing the position of each fuse and relay .
  5. Identify fuse/relay number 6, which is the fuel pump relay. It is rated at 20 amps .

The diagram on the cover is your best reference. If the cover is missing or faded, consult your owner’s manual or look for an online version of the 2007 Dodge Charger fuse box diagram .

Understanding the Two Fuse Boxes

To avoid confusion, it helps to understand what each fuse box controls. The under-hood TIPM handles high-current engine and safety systems. This is where you will find fuses for the radiator fan, ABS pump, ignition run/start feed, and headlamp control . The rear fuse box in the trunk manages most of the cabin electronics and the fuel system .

The rear fuse box contains the fuses and relays for the fuel pump, amplifier, heated seats, cluster, stop lights, airbags, and various other interior systems . This separation is intentional, as it keeps high-current engine components isolated from the more sensitive cabin electronics.

Symptoms of a Failing Fuel Pump Relay

A failing fuel pump relay can mimic other fuel system problems, so it is important to recognize the signs. Some of the most common symptoms include :

  1. Engine cranks but will not start: This is the most obvious sign. If you hear the starter turning the engine over but there is no fire, the fuel pump may not be receiving power.
  2. No fuel pump prime noise: When you turn the ignition to the ON position (without cranking), you should hear a brief whirring sound from the rear of the car. This is the fuel pump pressurizing the system. If you do not hear it, the relay may be faulty.
  3. Intermittent stalling: If the relay contacts are worn, the pump may lose power while the engine is running, causing the car to stall unexpectedly.
  4. Hard starting: The engine may take several cranks before it fires, indicating that fuel pressure is not building properly.

If you experience any of these symptoms, checking the fuel pump relay should be your first diagnostic step before replacing any parts.

How to Test the Fuel Pump Relay

Testing the relay is a straightforward process that requires a multimeter or a simple test light. Before you begin, ensure the ignition is OFF and disconnect the negative battery terminal to avoid any accidental shorts .

Follow these steps to test the relay:

  1. Remove the fuel pump relay from the rear fuse box by pulling it straight out of its socket .
  2. Inspect the relay visually. Look for signs of heat discoloration, melting, or a cracked housing. If you see any of these, replace the relay .
  3. Check for continuity. Using a multimeter set to the ohms setting, place the probes on the relay’s coil terminals. You should read a low resistance value, typically between 50 and 120 ohms. If you read infinite resistance, the coil is open and the relay is dead .
  4. Apply power to the coil. If you have a 12V power source, you can apply power and ground to the coil terminals and listen for a click. If you hear the click, the relay is mechanically functioning. If not, the relay is faulty.
  5. Test the switch contacts. With the relay energized, check for continuity across the switch terminals. You should see near-zero resistance. If the reading is high or infinite, the contacts are worn and the relay needs replacement.

If you are not comfortable working with a multimeter, you can also swap the fuel pump relay with an identical relay from another circuit in the same fuse box. If the fuel pump starts working after the swap, you have confirmed the relay is bad .

Replacing the Fuel Pump Relay

Replacing the relay is a simple DIY task that takes about five minutes. You do not need any special tools beyond a fuse puller or a pair of needle-nose pliers .

Here is how to do it:

  1. Purchase a replacement relay. It must match the amperage rating of the original, which is 20 amps for the fuel pump circuit . Using a relay with a higher rating can damage the wiring or the fuel pump.
  2. Remove the old relay by pulling it straight out of its socket. Do not twist or wiggle it excessively, as this can damage the terminals.
  3. Insert the new relay firmly into the socket. Make sure it seats completely.
  4. Reinstall the fuse box cover and the trunk floor liner.
  5. Reconnect the negative battery terminal and test the vehicle.

After replacement, turn the ignition to the ON position and listen for the fuel pump prime. If you hear it, the relay was the problem. If not, you may have a wiring issue or a faulty fuel pump.

What If the New Relay Blows Again?

If the new relay fails immediately or the same fuse blows again, you likely have a short circuit or a failing fuel pump drawing excessive current . In this case, do not simply replace the relay again, as this can lead to overheating and electrical damage .

Common causes of repeated relay failure include :

  1. A failing fuel pump motor: As the pump wears out, it draws more current, which can overload the relay.
  2. Moisture or corrosion in the fuse box or wiring connectors.
  3. Damaged wiring between the relay and the fuel pump, often caused by chafing or rodent damage.
  4. A shorted fuel pump circuit in the harness.

When you face repeated failures, it is time to test the fuel pump itself and inspect the wiring harness for damage. You should also check the fuel pressure to determine if the pump is delivering the correct volume and pressure .

How to Test Fuel Pressure on the 3.5L Engine

If the relay checks out but the car still will not start, the next step is to verify fuel pressure. Unlike some vehicles, the 2007 Dodge Charger 3.5L does not have a factory-installed fuel pressure test port on the fuel rail. This makes testing a bit more involved .

To test fuel pressure on your 2007 Charger, follow these steps:

  1. Relieve the fuel system pressure. Remove the fuel pump relay from the rear fuse box, start the engine, and let it run until it stalls. Then, crank the engine for a few seconds to ensure all pressure is released. Turn the ignition OFF and reinstall the relay .
  2. Disconnect the fuel supply line at the fuel rail. Use a fuel line disconnect tool to avoid damaging the fittings.
  3. Install a fuel pressure test adapter between the fuel supply line and the fuel rail. Most fuel pressure test kits include a T-adapter that will work for this purpose .
  4. Connect the fuel pressure gauge to the adapter.
  5. Turn the ignition to the ON position (do not start the engine) and observe the gauge. The pressure should rise to approximately 58 psi and hold steady .
  6. Start the engine and observe the pressure at idle. It should remain near the same value. If the pressure drops significantly, the fuel pump or the fuel pressure regulator may be failing.

Keep in mind that the fuel system is under constant pressure even with the engine off, so always relieve the pressure before opening any fuel line connections .

Additional Fuses Worth Knowing

While you are in the fuse box, it pays to know a few other important circuits. The rear power distribution center contains fuses that protect the ignition switch, the cluster, the stop lights, and the airbag control module, among others . The under-hood TIPM contains fuses for the radiator fan, ABS pump, and the fuel injectors .

Here are a few key fuses and relays you might need in the future :

  • Fuse 6 (20A): Fuel pump relay circuit
  • Fuse 42 (30A): Front blower motor
  • Fuse 43 (30A): Amplifier, antenna, rear defrost
  • Fuse 8 (15A): Ignition switch, airbag control module

Knowing these locations can save you a trip to the mechanic if you ever need to troubleshoot a dead accessory or an electrical fault.

Preventing Future Fuel Pump Relay Issues

Fuses and relays are wear items, but you can extend their life with a few simple habits :

  1. Keep the fuse box cover securely installed. This keeps moisture and dust out of the connectors.
  2. Inspect the fuse box periodically for signs of corrosion, moisture, or loose connections .
  3. Use only the correct amperage fuses. Never substitute a higher-rated fuse, as it can cause wiring damage or a fire hazard .
  4. Keep spare fuses in the glove box. Common sizes include 10A, 15A, 20A, and 30A, which cover most circuits in both fuse boxes .

If you drive your Charger in wet or humid conditions, pay extra attention to the trunk fuse box, as moisture can accumulate near the spare tire well .

Recommendations: Choose a High-Quality Replacement Fuel Pump

If you have confirmed that the relay is working correctly but the fuel pump itself is failing, do not settle for a cheap, unknown brand replacement. A faulty fuel pump can strand you on the highway, damage your fuel system, or cause engine performance issues that are difficult to diagnose.

For a dependable replacement, consider the KEMSO brand fuel pump. KEMSO fuel pumps are known for high performance and are designed as direct OEM replacements. This means you get a part that fits your 2007 Dodge Charger 3.5L correctly the first time, without modification. Every KEMSO fuel pump comes with a lifetime warranty, which gives you peace of mind that your investment is protected for as long as you own the vehicle.

When you choose KEMSO, you are selecting a product built to meet or exceed original equipment specifications. That level of reliability matters, especially when you need to trust your car to start every morning. To browse KEMSO fuel pump options and find the right fit for your Charger, visit their official website at https://www.kemsoracing.com/.

Final Thoughts on the 2007 Dodge Charger 3.5 Fuel Pump Relay

The fuel pump relay on your 2007 Dodge Charger 3.5L is a small component with a big job. When it fails, your car will not run, and finding the problem can be confusing if you do not know where to look. Now you know that the relay is located in the trunk fuse box, not under the hood, and that it is a 20-amp unit .

Start with the simplest fix: check the relay, test it, and replace it if needed. If the problem persists, move on to testing fuel pressure and inspecting the wiring. With the information in this guide, you can diagnose and fix the issue without unnecessary trips to the mechanic .

And if the fuel pump itself turns out to be the culprit, remember that a high-quality replacement from KEMSO comes with the durability and warranty you need to get back on the road with confidence. Visit https://www.kemsoracing.com/ to find the right fuel pump for your 2007 Dodge Charger 3.5L today.


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