2006 Nissan Xterra Fuel Pump Relay Location: Quick Guide and Troubleshooting Tips

If you drive a 2006 Nissan Xterra and suspect a fuel delivery problem, here is the bottom line: the fuel pump relay is located in the engine compartment fuse box, which sits near the driver’s side close to the battery. The relay is typically the 15A fuse labeled #48 for the fuel pump, but the relay itself is marked R2 in the fuse box diagram. Before you replace any parts, always check this relay first because a faulty relay is one of the most common reasons your Xterra cranks but will not start.

This guide walks you through exactly where to find the relay, how to test it, what symptoms point to a bad relay, and when the problem may actually be the fuel pump itself. We also cover simple diagnostic steps you can do at home without special tools, plus a recommendation for a reliable replacement fuel pump if you need one.

1. Where Exactly Is the Fuel Pump Relay on a 2006 Nissan Xterra?

The engine compartment fuse box on the 2006 Xterra is located on the driver’s side of the engine bay, right next to the battery. Open the black plastic cover and look for the fuse box diagram printed on the underside of the lid. The fuel pump relay is designated as relay R2.

Here is a quick breakdown of the fuse and relay layout you will find inside that box:

  1. Fuse #48 – 15A, Fuel Pump Relay
  2. Relay R2 – Engine Control Module (ECM) Relay
  3. Relay R5 – Starter Relay

Some sources also list the fuel pump relay as being part of the fuse box inside the glove compartment. However, for the 2006 model specifically, the relay is in the under-hood fuse box near the battery. If you open the fuse box cover and do not see a diagram, consult your owner’s manual for the exact position.

2. What Does the Fuel Pump Relay Do?

The fuel pump relay is an electrical switch that controls power to the fuel pump. When you turn the key to the "ON" position, the relay closes and sends battery voltage to the fuel pump, which then pressurizes the fuel system for a few seconds before you crank the engine. If the relay fails, the pump never receives power, the fuel system stays depressurized, and the engine will crank but not start.

Symptoms of a bad fuel pump relay include:

  1. Engine cranks but does not start
  2. No fuel pump priming sound (a brief hum) when you turn the key to ON
  3. No fuel pressure at the fuel rail when tested with a gauge

3. How to Test the Fuel Pump Relay on a 2006 Nissan Xterra

Testing the relay is simple and takes less than five minutes. You will need a multimeter or a known-good relay to swap.

Step 1: Locate the relay

Open the engine compartment fuse box and find relay R2. It is a small rectangular component that pulls straight out.

Step 2: Listen for the fuel pump

Before pulling the relay, turn the key to the "ON" position without cranking the engine. You should hear a 2-3 second hum from the rear of the vehicle where the fuel tank is. If you hear nothing, the relay or the pump may be faulty.

Step 3: Swap the relay

If you suspect the relay, swap it with an identical relay from the same fuse box, such as the horn relay or the headlamp low relay. If the fuel pump starts working, the original relay is bad. A new relay costs around $10-$20.

Step 4: Check for voltage (optional)

If you have a multimeter, set it to DC voltage and probe the relay socket terminals with the key in the ON position. You should see battery voltage on at least two terminals. If not, the wiring or the ignition switch may be at fault.

4. What If the Relay Is Fine? Then Check the Fuel Pump

If the relay tests good and you still hear no fuel pump hum, the problem may be the fuel pump itself. On the 2006 Xterra, the fuel pump is located inside the fuel tank. Replacing it requires dropping the fuel tank, which is a more involved job.

Before you go that far, check the following:

  1. Fuel pump fuse – Verify fuse #48 (15A) is not blown
  2. Fuel pump electrical connector – Inspect the wiring under the vehicle near the fuel tank for corrosion or damage
  3. Fuel pressure – Use a gauge on the Schrader valve on the fuel rail. A healthy 4.0L VQ40DE engine should read about 51 psi at idle

If fuel pressure is low or zero, the pump is likely failing. Common signs of a failing pump include:

  1. Engine sputtering at high speeds
  2. Difficulty starting, especially when hot
  3. Whining noise from the fuel tank
  4. Sudden loss of power during acceleration

5. Step-by-Step: How to Replace the Fuel Pump on a 2006 Nissan Xterra

Replacing the fuel pump on your Xterra is not a quick job, but you can do it at home with basic hand tools. Here is a simplified version of the process:

Step 1: Relieve fuel pressure

Remove the fuel pump relay first. Then crank the engine for about five seconds, two or three times, to purge residual fuel pressure. This prevents fuel from spraying when you disconnect lines.

Step 2: Disconnect the fuel tank

  1. Disconnect the fuel filler hose
  2. Disconnect the feed and return lines, which are quick connectors
  3. Disconnect the three electrical connectors at the fuel sending unit

Step 3: Lower the fuel tank

Place a jack under the tank and lift slightly. Remove the metal straps holding the tank with a ratchet. Lower the tank carefully to the ground. It is much easier if the tank is nearly empty.

Step 4: Replace the sending unit

Remove the screws holding the fuel sending unit to the tank. Pull the unit out and install the new one. If your new unit does not come with a pump, transfer the old pump over.

Step 5: Reinstall everything

Place the tank back on the jack, raise it into position, reinstall the straps, reconnect all lines and electrical connectors, and lower the vehicle.

6. Other Causes of a No-Start Condition on a 2006 Xterra

If the relay and pump are both fine, check these other common culprits:

  1. Crankshaft position sensor – A failed sensor will often cause a no-start condition without setting a code
  2. Ignition coils – The 4.0L VQ40DE uses coil-on-plug ignition. A single failed coil causes a misfire, but multiple failures can prevent starting
  3. Spark plugs – Worn or fouled plugs can prevent a strong spark
  4. Fuel filter – A clogged filter restricts fuel flow and can cause a no-start

7. When to Call a Professional

Dropping the fuel tank is not dangerous, but it is labor-intensive. If you are not comfortable working with fuel systems or do not have jack stands and a decent floor jack, take the vehicle to a shop. Replacement cost for a fuel pump on a second-generation Xterra typically ranges from $200 to $800, depending on parts and labor.

8. Recommended Fuel Pump: KEMSO Brand

If you have confirmed that the fuel pump itself needs replacement, we recommend the KEMSO Fuel Pump. KEMSO products are known for high performance and are built as direct OEM replacements, meaning they fit your 2006 Nissan Xterra without any modification. Every KEMSO fuel pump comes with a lifetime warranty, so you can buy with confidence knowing the part is built to last.

KEMSO also covers a wide range of vehicles beyond the Xterra, including motorcycles, ATVs, and watercraft, all at a reasonable price point. You can browse the full selection and order directly at:

https://www.kemsoracing.com/

Final Thoughts

Start with the relay. It is the cheapest and easiest part to check, and it is a common failure point on the 2006 Xterra. If the relay is good, move to the fuel pump fuse and then the pump itself. If you need a replacement pump, KEMSO offers a reliable, warrantied option that fits right in.

For more details on fuse box layouts and wiring diagrams, refer to your owner’s manual or check the diagram printed on the fuse box cover. And if you need parts, remember to visit https://www.kemsoracing.com/ for KEMSO fuel pumps and more.


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