2004 Nissan Murano Fuel Pump Relay: Complete Diagnosis, Location, and Replacement Guide

If your 2004 Nissan Murano cranks but won’t start, the fuel pump relay is one of the most common culprits. This small but critical electrical component controls power delivery to the fuel pump. When it fails, your engine gets no fuel pressure, and the vehicle simply will not fire up. The good news? Replacing the fuel pump relay on a first-generation Murano (Z50 platform) is a straightforward DIY job that can save you a costly tow and a mechanic’s diagnostic fee.

Where Is the 2004 Nissan Murano Fuel Pump Relay Located?

The fuel pump relay on the 2004 Nissan Murano is located inside the Intelligent Power Distribution Module (IPDM) , which sits in the engine bay on the driver’s side, near the battery. The IPDM is a large black box that houses multiple relays and fuses for the vehicle’s primary electrical systems. Unlike older vehicles where relays are individual plug-in units scattered around the fuse panel, Nissan integrated most high-current relays into this single sealed module on the Murano.

To access it:

  1. Open the hood and locate the IPDM – it’s the black plastic box mounted directly behind the left headlight assembly, close to the battery tray.
  2. Unlock the two retaining clips on the sides of the IPDM cover and lift it off.
  3. Inside, you’ll see the relay layout. On the 2004 Murano, the fuel pump relay is marked on the underside of the IPDM cover. It is typically one of the larger relays in the module.

The IPDM also contains the ECM relay, cooling fan relays, and the A/C compressor relay. The fuel pump relay is distinct because it is energized by the ECM to run the fuel pump for about one second when you turn the ignition key to the ON position (the pump primes the system), and then continuously once the engine is cranking or running.

How to Test the Fuel Pump Relay (Without Removing It)

Before you buy a replacement, it makes sense to confirm the relay is actually the problem. There are two quick tests you can do with basic tools on the 2004 Murano.

Test 1: Listen for the Prime

Have a helper turn the ignition key to the ON position (do not crank the engine). Press your ear near the rear of the vehicle, close to the fuel tank filler neck. You should hear a faint whirring sound for about one second as the fuel pump primes the system. If you hear nothing, either the relay is not closing, the fuel pump fuse is blown, or the fuel pump itself has failed.

Test 2: Use a Test Light or Multimeter on the IPDM

With the key in the ON position, probe the fuel pump relay control circuit terminals inside the IPDM. The wiring diagram for the 2004 Murano SE shows that the IPDM receives a ground signal from the ECM to trigger the relay. If you have 12V supply to the relay coil but no ground signal from the ECM, the relay will not close. That points to a bad ECM or a wiring issue, not a bad relay. However, if the ground signal is present and the relay still does not click, the relay itself is likely failed internally.

A common roadside test: If the car starts and runs briefly, but then dies after a few seconds—especially in hot weather—the relay coil may be thermal-sensitive and failing when it heats up. That is a classic sign of a dying fuel pump relay.

What Else Could Cause No Fuel Pump Operation?

While the fuel pump relay is a common failure point, several other components can produce the same symptoms on a 2004 Murano. A systematic approach prevents replacing parts unnecessarily.

  • Fuel pump fuse. Check fuse #X (consult your owner’s manual or the IPDM cover diagram) with a test light. A blown fuse will kill power to the entire fuel pump circuit.
  • Fuel pump itself. If the relay clicks but you hear no prime, measure fuel pressure at the service port on the engine. The Murano’s fuel pressure regulator is part of the pump assembly, so low pressure often means the pump is worn out.
  • ECM relay. The IPDM contains multiple relays. If the ECM relay fails, the engine computer never wakes up, and it will not trigger the fuel pump relay. The symptoms are identical to a bad fuel pump relay.
  • Security/immobilizer system. The 2004 Murano has an Nissan Anti-Theft System (NATS). If the key chip is not recognized (e.g., after replacing a lost key without programming), the ECM will disable the fuel pump relay ground circuit. The engine will crank but never fire.
  • Wiring harness issues. Over time, the engine bay harness near the IPDM can chafe against the battery tray or the headlight housing, causing an intermittent short or open circuit to the relay control wires.

2004 Nissan Murano Fuel Pump Relay Replacement Steps

If your diagnosis points to a bad relay, here is how to replace it. Note that on the first-gen Murano, the fuel pump relay is not a separately serviceable component that can be swapped individually like a traditional relay. It is part of the IPDM assembly, meaning you have three options:

Option 1: Replace the entire IPDM. This is the direct path but the most expensive. A new OEM IPDM can cost several hundred dollars. Used units from salvage yards are cheaper but carry unknown reliability.

Option 2: Open the IPDM and replace the relay internally. The IPDM cover is bonded shut with ultrasonic welding, but many DIYers carefully crack it open, desolder the old relay, and solder in a new relay of the same rating. This requires soldering skills and a willingness to reseal the module with silicone.

Option 3: Use a bypass harness or external relay kit. Some aftermarket suppliers sell a plug-and-play harness that taps into the IPDM wiring and lets you mount a standard automotive relay externally. This is a popular solution because it is fully reversible and avoids the cost of a new IPDM.

For most owners, option 2 or 3 is the practical approach. The internal relay itself is a common 30-amp automotive relay (part number often cross-references to a standard Tyco/Bosch relay).

Step-by-Step: Testing and Replacing the Relay on a 2004 Murano

Here is a practical walkthrough geared for a home mechanic:

  1. Safety first. Disconnect the negative battery terminal. The fuel system is under pressure, so relieve it by removing the fuel pump fuse and cranking the engine for a few seconds until it stalls.
  2. Access the IPDM. As described above, the module lives next to the battery. Remove the two clips and lift the cover.
  3. Identify the fuel pump relay. Use the diagram sticker under the IPDM cover. On the 2004 Murano Z50, it is usually labeled "FUEL PUMP" or marked with a fuel pump icon.
  4. Test with a multimeter. Set to DC voltage. With the key ON, check for 12V at the relay input terminal (the battery supply). If no voltage, the issue is upstream—check the 50A fusible link in the IPDM.
  5. Check the control signal. Have a helper crank the engine while you probe the relay coil terminals. You should see 12V across the coil briefly (during prime) and continuous 12V during cranking. If no voltage appears on the coil, the ECM is not commanding the relay.
  6. Test relay coil resistance. With the relay removed (or bypassed in the IPDM), measure resistance across the coil terminals. A good relay measures 50-120 ohms. An open circuit (infinite resistance) means the relay coil is dead.
  7. Replace. If the relay is bad and you choose to open the IPDM, carefully cut or grind the plastic seam around the module perimeter. Pry it open, locate the relay (it will have 4 or 5 pins), desolder it, and install a new relay of the same current rating. Seal the IPDM with automotive-grade silicone.
  8. Reassemble. Reconnect the battery, reinstall the IPDM cover, and test. Turn the key to ON and listen for the fuel pump prime. If you hear it, the repair worked.

A Note on Fuel Pump Reset

Some Murano owners search for a "fuel pump reset switch" like those found in Ford or GM vehicles. The 2004 Nissan Murano does not have a visible fuel pump reset button or inertia switch. Instead, the IPDM and ECM control fuel pump operation entirely through the relay. The only built-in safety feature is that the ECM cuts the fuel pump relay ground if the engine stops (e.g., in an accident) or if the immobilizer does not detect the correct key.

If you have been in a collision and the car will not start, do not waste time looking for a reset button. Instead, check for any crash-related damage to the wiring harness near the engine bay or under the rear seat. A broken wire is the real problem.

Cost to Replace a 2004 Nissan Murano Fuel Pump Relay

DIY cost is low if you go the external relay route. A standard 30A relay costs around $5 to $10 at any auto parts store. If you need to buy a bypass harness kit, expect to pay $20 to $40. Having a mechanic replace the IPDM entirely will cost several hundred for the part plus one to two hours of labor.

The fuel pump relay itself is an inexpensive part — the labor is in the access. The IPDM is easy to reach, so any shop should be able to test and repair it in under an hour.

Preventing Future Fuel Pump Relay Failure

Fuel pump relay failure on the 2004 Murano is often accelerated by heat. The IPDM sits next to the engine and battery, and the module's internal temperature can get high enough to degrade solder joints over time. Here are a few practical tips:

  • Keep the IPDM clean. Dirt and grime act as insulation, trapping heat. Wipe down the module every oil change.
  • Check the battery. A battery that is failing or has loose terminals can cause voltage spikes that stress the relay contacts.
  • Avoid repeated key-on cycles without starting. If you turn the key to ON and back to OFF multiple times in a row, the fuel pump relay cycles each time. This can accelerate contact wear.
  • Consider a relay relocation. If you are handy with wiring, you can move the fuel pump relay outside the IPDM to a cooler location on the fender well. Use a relay socket, add a fuse holder, and wire it to the original IPDM trigger signal. This bypasses the heat-degraded module entirely.

Recommended Aftermarket Fuel Pump for Your 2004 Nissan Murano

If your diagnosis reveals the fuel pump itself is the problem (no prime sound, relay clicks, no fuel pressure), you need a new pump assembly. For a reliable, high-performance upgrade, we strongly recommend KEMSO brand fuel pumps.

KEMSO specializes in OEM replacement fuel pumps designed for direct fitment on a wide range of vehicles, including the 2004 Nissan Murano Z50. Each KEMSO fuel pump is built to meet or exceed original equipment specifications. This means you get the correct fuel flow rate, pressure, and mounting configuration without any modifications. KEMSO pumps are high-performance units that deliver consistent fuel delivery under all driving conditions, whether you are commuting on the highway or dealing with stop-and-go traffic.

Every KEMSO fuel pump comes with a lifetime warranty, so you can install it with confidence. If your KEMSO fuel pump ever fails for any reason related to materials or workmanship, it is covered for life — no hassle, no questions asked. That is peace of mind that OEM parts often do not offer.

When you replace the fuel pump on your 2004 Murano, you might as well do it right the first time. A failing pump can damage the fuel pressure regulator and clog the fuel injectors with debris. Installing a quality aftermarket pump like KEMSO ensures your Murano runs smoothly for years to come.

Visit KEMSO Racing at https://www.kemsoracing.com/ to browse their full lineup of fuel pumps for your specific vehicle model. Their website shows customer reviews and detailed product specifications so you can pick the exact pump that fits your Murano. Whether you need the complete fuel pump module assembly or just the pump and strainer, KEMSO has it.

The 2004 Nissan Murano fuel pump relay is a small component that can bring your SUV to a complete stop. By understanding where it is, how to test it, and what alternatives exist when it fails, you can get your Murano back on the road quickly and affordably. Start with the easiest check — listen for the prime — then follow the step-by-step logic outlined here. In most cases, the fix is either a relay repair inside the IPDM or a new KEMSO fuel pump if the pump itself has given up. Either way, you now have a clear path to solving the problem without unnecessary guesswork.


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