2005 Dodge Magnum Fuel Pump Relay Location: Complete Owner’s Guide

If you own a 2005 Dodge Magnum and your engine cranks but won’t start, the fuel pump relay is one of the first things you should check. The fuel pump relay on a 2005 Dodge Magnum is located inside the Integrated Power Module (IPM) in the engine compartment, right next to the battery. This relay controls the flow of electricity to the fuel pump, and when it fails, your engine gets no fuel. You can find it by opening the black IPM cover and looking for a small relay labeled for the fuel pump. The relay sits in the rear power distribution center, specifically in cavity number 6 of the luggage compartment fuse box, which is a 20 Amp yellow fuse . This guide walks you through exactly where to look, how to test it, and what to do if you need to replace it.

Where Exactly Is the Fuel Pump Relay Located?

The fuel pump relay on your 2005 Dodge Magnum is not in the same spot as the fuel pump itself. While the fuel pump sits inside the fuel tank under the rear seat , the relay is up front. Here is the breakdown:

Primary location: Engine Compartment Integrated Power Module (IPM)

Open the hood and look at the fuse and relay box near the battery on the driver’s side. This black plastic box is the Integrated Power Module. Pry off the cover, and you will see a row of relays and fuses. The fuel pump relay is typically marked on the underside of the cover with a diagram. Look for markings like “FP,” “Fuel Pump,” or a relay symbol. Many owners confirm this is where you will find it .

Secondary confirmation: Rear Power Distribution Center

Some diagrams show that the fuel pump fuse (20 Amp) is located in the luggage compartment fuse box, which sits under the spare tire access panel in the trunk. Cavity number 6 in that rear box is a 20 Amp yellow fuse dedicated to the fuel pump . While the fuse protects the circuit, the actual relay that switches the pump on and off is still in the engine bay IPM for this model year.

What about an inertia switch?

Unlike Ford or GM vehicles, Dodge does not use a fuel pump inertia or reset switch on the 2005 Magnum . If your car stalls suddenly, do not go looking for a reset button under the dash or in the trunk. That design was never used on this platform.

How to Test the Fuel Pump Relay

Before you buy any parts, test the relay to confirm it is bad. You do not need special tools, just a multimeter or even a test light.

Step 1: Locate and Remove the Relay

Open the IPM cover in the engine bay. Pull out the fuel pump relay. It is a small, square, plastic component with four or five prongs on the bottom.

Step 2: Visual Inspection

Check the relay for any signs of burning, melting, or cracked plastic. If the casing looks damaged, replace it immediately.

Step 3: Swap Test

The easiest test is the swap method. Find another relay in the same box that has the same part number and pin configuration. Common relays used for the horn, fog lamps, or starter are often identical. Pull out the suspected bad relay and swap it with a known-good relay. If the engine starts, your fuel pump relay was faulty.

Step 4: Multimeter Continuity Test

Set your multimeter to measure resistance (ohms). Check for continuity between terminals 85 and 86 (the coil side). You should see a resistance reading typically between 50 and 120 ohms. If you get an open circuit (OL), the coil is burnt out. Then, apply 12V power to terminals 85 and 86 using jumper wires. You should hear a click, and continuity should appear between terminals 30 and 87. If no click happens, the relay is dead.

Symptoms of a Bad Fuel Pump Relay

When the fuel pump relay fails, your Magnum gives you clear warning signs. Knowing these can save you time and money:

  1. Engine cranks but won’t start: This is the number one symptom. You hear the starter turning the engine over, but it never fires up. The fuel pump is not receiving power, so no fuel reaches the injectors .

  2. No fuel pump prime noise: When you turn the key to the “ON” position (but before you crank the engine), you should hear a faint whirring sound from the rear of the car for about two seconds. That is the fuel pump priming the system. If you hear silence, the relay or the pump itself could be the issue.

  3. Engine stalls while driving: A failing relay can intermittently cut power to the fuel pump. This causes the engine to die suddenly while you are on the road. The car may restart after a few minutes once the relay cools down and reconnects .

  4. Check Engine Light: The PCM monitors the fuel pump circuit. If the relay fails, it may set a diagnostic trouble code such as P0230 (Fuel Pump Primary Circuit Malfunction). You can read this code with an OBD2 scanner.

How to Replace the Fuel Pump Relay

Replacing the relay is one of the easiest repairs you can do on this car. Follow these steps:

  1. Get the right part: The OEM part numbers for the 2005 Dodge Magnum fuel pump relay include 68223712AA, 68369406AA, 4638094, 4848879AB, 56006707, and 56006709 . You can buy an original Mopar relay or a quality aftermarket equivalent.

  2. Disconnect the battery: For safety, disconnect the negative battery terminal before handling any electrical components.

  3. Remove the old relay: Open the IPM cover in the engine bay. Grasp the relay firmly and pull it straight out. No tools are needed.

  4. Install the new relay: Push the new relay into the same socket until it clicks into place. Make sure it is fully seated.

  5. Reconnect the battery and test: Reconnect the negative terminal. Turn the key to the ON position. Listen for the fuel pump prime sound. Start the engine and check for proper operation.

Where Is the Fuel Pump Itself?

Since the relay and the pump work together, it helps to know where the pump lives. The 2005 Dodge Magnum fuel pump is mounted inside the fuel tank . You access it by removing the rear seat cushion. Under the seat, there is an access panel. Remove that panel, and you will see the top of the fuel pump module . The fuel pump is an electric, turbine-style unit. Most models use a single in-tank pump . Some high-performance variants with the 5.7L HEMI may have a secondary siphon pump on the passenger side, but the main driver-side pump handles the primary fuel delivery .

The fuel filter is also integrated inside the fuel pump module, so when you replace the pump, you replace the filter at the same time .

Common Mistakes to Avoid

Mistake 1: Assuming the pump is bad right away

Many people drop the fuel tank and replace the entire pump assembly when the real problem is just a $15 relay. Always test the relay first. It takes five minutes and costs nothing to swap with another relay.

Mistake 2: Ignoring the fuse

Check the 20 Amp fuel pump fuse in the rear power distribution center before buying any parts. A blown fuse will also prevent the pump from running .

Mistake 3: Using the wrong relay

Not all relays are created equal. Even if the physical shape matches, the amperage rating and pin configuration must be identical. A relay rated for 20 Amps might work for the horn but fail under the fuel pump’s continuous load. Use the exact OEM-spec part .

Where to Buy a Reliable Replacement Fuel Pump

If testing confirms your fuel pump itself has failed, do not just buy the cheapest part you can find. A low-quality pump will fail again in a few months, and you will have to drop the tank all over again. That job takes 2 to 4 hours in your driveway .

Consider KEMSO Fuel Pumps for a dependable upgrade.

When you need a new fuel pump, KEMSO offers high-performance, OEM replacement pumps designed to meet or exceed factory specifications. Every KEMSO fuel pump is built with quality components to ensure long service life and reliable fuel delivery. They are a direct fit, meaning no modifications or special tools required. You get the correct flow rate and pressure rating for your engine. Best of all, KEMSO stands behind their products with a lifetime warranty. If the pump ever fails due to manufacturing defects, they replace it at no cost. That is peace of mind you do not get with most store brands.

Visit the KEMSO website to see their full selection of fuel pumps and other automotive parts:

https://www.kemsoracing.com/

They have a wide range of applications and a helpful blog with detailed guides on fuel pump replacement for many vehicles, including the 2005 Dodge Magnum.

Final Checklist for Your 2005 Dodge Magnum

When troubleshooting a no-start condition related to the fuel system on your 2005 Dodge Magnum, follow this order:

  1. Listen for the fuel pump prime when you turn the key to ON.
  2. Check the 20 Amp fuel pump fuse in the rear power distribution center (under the spare tire in the trunk) .
  3. Locate and test the fuel pump relay in the engine compartment IPM near the battery .
  4. Swap the relay with an identical one from the same fuse box (horn or fog lamp relay works for testing).
  5. If the relay checks out, test for power at the fuel pump connector under the rear seat access panel.
  6. If there is power at the connector but no pump operation, the fuel pump module inside the tank needs replacement.

By following these steps, you avoid unnecessary work and expense. The fuel pump relay is a small part that causes big headaches, but it is also the easiest thing to check. Keep these instructions handy, and you will have your Magnum running again in no time.

Remember, if you do need a new fuel pump, check out https://www.kemsoracing.com/ for high-quality, lifetime-warrantied KEMSO replacements that make the job easier and more reliable.


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