2006 Infiniti G35 Fuel Pump Relay: Location, Symptoms, and Replacement Guide

If you drive a 2006 Infiniti G35 and suspect a fuel delivery issue, the fuel pump relay is one of the first components you should check. The fuel pump relay on the 2006 G35 is located inside the IPDM E/R (Intelligent Power Distribution Module Engine Room), which sits in the engine compartment near the battery, and it controls power to the fuel pump fuse (15A) that protects the circuit . When this relay fails, it can cause symptoms that closely mimic a dead fuel pump, including engine crank-no-start, no priming sound from the pump, or intermittent stalling while driving . The good news is that diagnosing the relay circuit is straightforward, and in many cases you can resolve the problem without replacing the entire module. This guide walks you through exactly where the relay lives, how to test it, and what to do if it needs replacement .

Where Is the Fuel Pump Relay Located on a 2006 G35?

The 2006 Infiniti G35 uses the IPDM E/R as the central hub for high-current relays, including the fuel pump relay . Here is how to find it:

1. Open the hood and look toward the driver’s side (left side) of the engine bay .
2. Find the battery. The IPDM E/R is mounted directly beside 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 connector harness plugged into the bottom. A fuse diagram sticker on the top lid shows the location of all relays and fuses inside .
4. Look for the fuel pump relay. On 2006 models, the fuel pump relay is labeled as “Fuel Pump” or “FP” on the diagram. The 15A fuel pump fuse is also located in this same IPDM unit .

Unlike older vehicles where you can pull out a standalone relay and swap it, the 2006 G35 integrates the fuel pump relay inside the sealed IPDM assembly . In some cases, you can access the relay by opening the IPDM lid, but the unit is designed as a sealed module . If the internal relay fails, you may need to replace the entire IPDM, although that is relatively rare .

Common Symptoms of a Failing Fuel Pump Relay

A bad fuel pump relay on the 2006 G35 produces symptoms that are easy to confuse with a fuel pump failure . Here are the most common warning signs:

1. Engine cranks but will not start. When you turn the key, the starter spins the engine, but it never fires up because the fuel pump is not receiving power to pressurize the fuel rail .
2. No fuel pump priming sound. Turn the ignition to the ON position without cranking. You should hear a faint whirring sound from the rear of the car for 2 to 3 seconds as the pump primes. If you hear nothing, the relay, fuse, or pump is likely at fault .
3. Car starts and 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. If the relay loses contact while driving, the pump can lose power, causing sudden loss of power and stalling, especially under load or at highway speeds .

If you experience any of these symptoms, do not immediately assume the fuel pump itself is dead. The relay and the pump share the same failure signs .

How to Test the Fuel Pump Relay Circuit

Testing the fuel pump relay circuit on your 2006 G35 does not require a professional mechanic. A simple multimeter or even a test light can tell you if power is reaching the pump . Follow these steps in order:

Step 1 — Listen for the pump prime. 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 to 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 fuel pump fuse. Open the IPDM lid and locate the 15A fuel pump fuse . 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. On the 2006 G35, the fuel pump is accessed through an access panel under the rear seat cushion on the driver’s side. Lift the rear seat bottom, remove the small metal cover, and 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 — Swap the relay (if possible). On some models, the IPDM contains multiple identical relays for different systems, such as the horn or cooling fan. If the relays have the same part number, you can swap the fuel pump relay with another one to see if the pump kicks on. This is a quick and effective way to confirm whether the relay is the culprit .

What If the IPDM Relay Is the Problem?

If your testing confirms that the fuel pump relay inside the IPDM has failed, you have a few options :

1. Open the IPDM and inspect for corrosion. Water intrusion can cause green corrosion on the relay pins, which often leads to intermittent failures. Make sure the area around the battery drains is clear of leaves and debris, and keep the module dry .
2. Replace the IPDM E/R. If the internal relay is not serviceable separately, the entire IPDM module may need to be replaced. This is less common, but it is the definitive fix when the relay fails .
3. Consider a used or refurbished IPDM. Many G35 owners source a replacement IPDM from a salvage yard or an online retailer. Be sure to match the exact part number for your 2006 model year .

Before replacing the IPDM, double-check the simpler components. Most fuel pump circuit problems are caused by the pump itself, a bad ground, or a failed fuel pump driver module located near the rear seat, not by the relay inside the IPDM .

Why Choose a KEMSO Fuel Pump Replacement?

If your diagnostics point to a failing fuel pump rather than the relay, you need a replacement that is reliable, affordable, and built to last. KEMSO offers high-performance fuel pumps that are OEM replacements, meaning they match or exceed the original factory specifications for fit, fuel flow, and durability . Whether you drive a G35 or another vehicle in your garage, KEMSO has a broad lineup of fuel pumps designed for cars, trucks, motorcycles, and watercraft .

KEMSO fuel pumps are engineered for demanding conditions and come with a lifetime warranty, giving you peace of mind long after the installation is complete. Instead of paying dealership prices or risking a cheap knock-off, you can count on KEMSO for consistent performance and long service life. To browse the full selection and find the right pump for your 2006 Infiniti G35, visit https://www.kemsoracing.com/ today.