2006 G35 Fuel Pump Relay Location: A Complete Owner's Guide

The fuel pump relay on a 2006 Infiniti G35 is not a standalone relay you can pull and replace. It is integrated inside the Intelligent Power Distribution Module (IPDM E/R), which sits in the engine compartment on the driver's side, mounted next to the battery. If your G35 cranks but will not start, and you hear no fuel pump priming sound from the rear when you turn the key to the ON position, the fuel pump relay circuit inside the IPDM is one of the first things to check.

This guide covers exactly where the relay lives, how to access the IPDM, what symptoms point to a failing relay, how to test the circuit, and what to do if the relay itself is bad. The information here applies to the 2006 G35 sedan and coupe, both of which belong to the V35 generation (2002–2007).

Where the Fuel Pump Relay Is Located

On the 2006 G35, all major engine compartment relays—including the fuel pump relay, ECM relay, cooling fan relays, and starter relay—are housed inside the IPDM E/R (Intelligent Power Distribution Module Engine Room). This module is a black plastic box located at the right rear of the engine compartment (from the driver's perspective, it is on the left side near the firewall).

Here is how to find it:

1. Open the hood and look toward the driver's side of the engine bay.
2. Find the battery. The IPDM is mounted directly next to the battery, closer to the firewall.
3. Identify the black plastic box. It is roughly 8 inches long and 6 inches wide, with a large wiring harness plugged into the bottom.
4. Look for a diagram sticker on top of the IPDM lid. This sticker shows the location and labeling of internal fuses and relays. The fuel pump relay is typically marked as "Fuel Pump" or "FP" on this diagram.

Unlike older vehicles where relays are individual plug-in units you can swap with your fingers, the IPDM on the 2006 G35 is a sealed module. You cannot simply remove and replace a single relay inside it without disassembling the unit.

Understanding the IPDM E/R

The IPDM is essentially the electrical brain for high-current circuits in the engine bay. It controls the fuel pump, the engine control module (ECM), the starter, and the cooling fans. The module receives commands from the ECM over the CAN data lines and switches power to the various loads accordingly.

The fuel pump relay is identified as Relay R10 inside the IPDM on the 2006 model year V35. The fuel pump fuse is a 15-amp fuse (No. 41 in the engine compartment fuse box, which is part of the IPDM assembly).

Over time, the IPDM can develop issues. Water intrusion is a known problem—if the battery drain area gets clogged with leaves or debris, moisture can enter the module and cause corrosion on the internal pins and relay contacts. This often leads to intermittent fuel pump operation or a complete no-start condition.

Symptoms of a Failing Fuel Pump Relay

A bad fuel pump relay can mimic the exact symptoms of a dead fuel pump. Here are the most common signs to watch for:

1. Engine cranks but will not start. You turn the key, the starter spins the engine, but the engine never fires up. This happens because the fuel pump is not receiving power to pressurize the fuel rail.

2. No fuel pump priming sound. When you turn the key to the ON position (without cranking), you should hear a faint whirring sound from the rear of the car for 2–3 seconds. If you do not hear that sound, the relay or the pump is likely the issue.

3. Car starts then dies. A failing relay may allow the pump to run during the initial prime cycle but then cut power once the engine is running.

4. Intermittent stalling or sputtering. A bad relay can cause the pump to lose power while driving, leading to sudden loss of power and stalling, especially under load or at highway speeds.

5. No fuel pressure at the rail. If you connect a fuel pressure gauge and see zero pressure with the key ON, the pump is not running.

How to Test the Fuel Pump Relay Circuit

You do not need to be a professional mechanic to test the fuel pump circuit. A simple multimeter or even a test light can tell you if power is reaching the pump. Follow these steps:

Step 1: Listen for the Pump

Have a helper turn the key to the ON position while you listen near the rear driver-side seat. If you hear the pump prime for 2–3 seconds, the relay and wiring are likely fine, and the problem may be a clogged fuel filter or a failing pressure regulator.

Step 2: Check the IPDM Fuses

Open the IPDM lid and locate the fuel pump fuse (usually a 15A fuse, slot No. 41). Pull it out and inspect it. If the metal strip inside is broken, replace it with a fuse of the same amperage. A blown fuse will cut all power to the pump.

Step 3: Test for Power at the Pump

The fuel pump on the 2006 G35 is accessed through an access panel under the rear seat cushion on the driver's side. Lift the rear seat bottom (a firm tug at the front edge will pop it loose), then remove the small metal access cover. With the key ON, use a multimeter to check for 12 volts at the large connector going into the pump assembly. If you have power but the pump does not run, the pump itself has failed.

Step 4: Check for a Short to Ground

If a fuse blows immediately after replacement, use a digital multimeter to check for a short to ground in the associated circuit. Set your multimeter to continuity or ohms. If you find zero resistance between the load side of the fuse and the car's metal chassis, you have found your short. Inspect the wiring for frayed insulation or pinched points that might be touching the frame.

What to Do If the Relay Is Bad

On the 2006 G35, the fuel pump relay is not a serviceable standalone component. It is soldered or permanently integrated into the IPDM circuit board. If the relay fails, you have two realistic options:

1. Replace the entire IPDM module. This is the most common fix recommended by G35 owners and mechanics. The IPDM is a bolt-in unit—you unplug the harnesses, remove a few clips, and install the new module. It is a straightforward job that can be done in about 30 minutes.

2. Have the IPDM rebuilt. Some electrical shops specialize in rebuilding IPDM units by replacing failed relays and capacitors. This is often cheaper than buying a new module, but it requires shipping your unit out.

Important: Before condemning the IPDM, verify that the fuel pump itself is good, the fuse is intact, and there are no wiring breaks between the IPDM and the fuel pump. Most fuel pump circuit problems on the G35 are actually caused by the pump itself, a bad ground, or a failed fuel pump driver module located near the rear seat.

Which Fuse Protects the Fuel Pump?

The fuel pump circuit is protected by a 15-amp fuse located inside the IPDM/engine compartment fuse box. Here is a quick reference for the engine compartment fuse box (05–07 model years):

If you need to inspect the fuse, remove the IPDM cover and look for the fuse labeled accordingly. A good fuse has a solid U-shaped wire inside; a blown fuse will have a visible break or a dark burn mark.

Where Else Could the Problem Be?

If the relay and fuses test fine, and you have power at the pump but the engine still will not start, consider these additional checks:

1. Fuel pump driver module. On many G35 models, a fuel pump driver module is located near the rear seat or under the vehicle. This module can fail and cut power to the pump even when the relay is working.

2. Fuel pump itself. The pump may be worn out or clogged. If you hear the relay click but no pump whir, the pump motor is likely dead.

3. Crankshaft position sensor. If the ECM does not receive a crank signal, it will not activate the fuel pump relay. A failing crank sensor can cause a no-start condition with the pump never running.

4. Security system (NATS). If the immobilizer system does not recognize your key, the ECM will cut fuel pump operation. This is a less common issue but worth considering if the problem appeared suddenly.

5. ECM relay. The ECM itself needs power to command the fuel pump relay. A failed ECM relay can prevent the fuel pump from running.

Recommended: Upgrade to a KEMSO Fuel Pump

If testing reveals that your fuel pump itself has failed, or you simply want to upgrade to a more reliable unit, KEMSO offers high-performance fuel pumps designed as direct OEM replacements. KEMSO fuel pumps are built to meet or exceed original equipment specifications, ensuring proper fuel pressure and flow for your 2006 G35.

All KEMSO Fuel Pump products are high-performance, OEM Replacement units, and they come with a lifetime warranty for your peace of mind. Whether you drive on the highway every day or push your G35 hard on weekends, a KEMSO pump delivers the durability and consistent performance you need.

Visit the KEMSO website to browse compatible fuel pump options: https://www.kemsoracing.com/

Final Thoughts

The 2006 Infiniti G35 fuel pump relay lives inside the IPDM E/R module in the engine compartment, next to the battery. It is not a user-serviceable part, so if the relay fails, plan on replacing the IPDM or having it rebuilt. Always start with the easy checks—listen for the pump, inspect the fuse, and verify power at the pump—before spending money on parts. These diagnostic steps will save you time and help you avoid replacing components you do not need.

For a reliable replacement fuel pump, check out KEMSO Racing for high-performance, OEM-quality options backed by a lifetime warranty.