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

If you own a 2006 Infiniti G35 and suspect a fuel delivery problem, the fuel pump relay is one of the first components you should check. The fuel pump relay is located in the engine compartment fuse box, mounted near the battery on the right side of the engine bay. This small but critical component controls power to the fuel pump, and when it fails, your G35 may crank but refuse to start, stall unexpectedly, or hesitate during acceleration. This guide walks you through the exact location, how to test the relay, and what to do if it needs replacement.

Understanding the Fuel Pump Relay's Role

The fuel pump relay acts as an electrical switch that sends battery power to the fuel pump when you turn the ignition key to the "ON" position. When functioning properly, you should hear a brief hum from the rear of the car for about 2-3 seconds after turning the key — that's the fuel pump pressurizing the fuel system. If you don't hear that hum, the relay is often the culprit.

The G35's fuel system relies on this relay to deliver fuel from the tank to the engine. A failing relay can produce symptoms that mimic a dead fuel pump, including:

  • Engine cranks but won't start
  • Intermittent stalling while driving
  • Long cranking times before the engine fires
  • Loss of power under load or at highway speeds
  • Engine dies suddenly and won't restart

Before you assume the fuel pump itself is bad, checking the relay should always be your first diagnostic step. It is one of the cheapest and easiest components to test and replace.

Locating the Fuel Pump Relay in Your 2006 G35

The 2006 Infiniti G35 has two fuse boxes: one in the engine compartment and one inside the cabin. The fuel pump relay lives in the engine compartment fuse box, which is positioned on the right side of the engine bay (as you face the car from the front) or the left side when standing in front of the vehicle, depending on market configuration. In North American models, the fuse and relay box sits at the right rear of the engine compartment near the battery.

Here is how to find it step by step:

1. Open the hood and secure it properly.

2. Look toward the back of the engine bay on the passenger side. You will see a black plastic cover over the fuse box assembly next to the battery.

3. Remove the plastic cover. On some models, you may need to unclip or unscrew a small retaining fastener. There is also a secondary fuse box underneath a separate plastic housing.

4. Identify the relay. The fuel pump relay is one of several identical-looking relays inside this box. On the 2006 G35, it is typically labeled as "Fuel Pump" on the underside of the fuse box cover. If the label is missing, consult the diagram printed on the cover or in the owner's manual.

5. Confirm you have the right relay. The fuel pump relay is usually a square, dark-colored component with four or five prongs on the bottom. It should match the size and shape of the other relays in the box.

For the 2006 model year specifically, the fuel pump relay is wired to fuse number 50 (15A) in the main engine compartment fuse box, according to detailed fuse diagrams. This fuse protects the fuel pump circuit, so it is worth checking as well.

The Second Fuse Box: A Note for G35 Owners

The 2006 Infiniti G35 actually has two engine compartment fuse boxes. The first one, described above, houses most of the engine-related fuses and relays. The second, smaller box is located near the battery and contains additional relays. While the fuel pump relay is in the primary box, it is good to know both locations in case you need to check other components like the horn or headlights.

In some 2006 G35 configurations, especially the coupe models, the fuse and relay layout may differ slightly from the sedan. Always verify against the diagram on your fuse box cover or owner's manual before replacing anything.

How to Test the Fuel Pump Relay

Once you have located the relay, testing it takes only a few minutes. Here are three methods you can use:

Method 1: The Swap Test

This is the quickest way to check if the relay is faulty.

  1. Remove the fuel pump relay from the fuse box.
  2. Find another relay in the same box that has the exact same part number and pin configuration. Commonly, the air conditioner relay or horn relay is identical.
  3. Install the known-good relay in the fuel pump slot.
  4. Turn the ignition to the "ON" position without starting the engine.
  5. Listen for the fuel pump hum from the rear of the car.

If you hear the hum, your original relay was bad and needs replacement. If you still hear nothing, the problem lies elsewhere — possibly in the fuel pump itself, the wiring, or the engine control module.

Method 2: Using a Multimeter

For a more precise check, use a digital multimeter set to measure resistance (ohms).

  1. Remove the relay from the fuse box.
  2. Identify the coil terminals (usually pins 85 and 86) and the switch terminals (pins 30 and 87). The pin numbers are typically printed on the relay casing.
  3. Measure resistance across the coil terminals. You should see a reading between 50 and 120 ohms. If you get no reading (infinite resistance), the coil is open and the relay is dead.
  4. Apply 12V power and ground to the coil terminals using a battery or power supply. You should hear a distinct click as the switch closes.
  5. With power applied, check continuity across the switch terminals (30 and 87). There should be zero or near-zero resistance. If there is no continuity, the relay's internal contacts are worn out.

Method 3: Listening for the Click

If you don't have a multimeter, a basic functional test works:

  1. Have a helper turn the ignition key to the "ON" position while you hold the relay in your hand.
  2. You should feel and hear a distinct click when power is applied to the relay coil.
  3. If there is no click, the relay is not receiving power or the coil is burned out.

Common Causes of Fuel Pump Relay Failure

Understanding why the relay fails can help you prevent future issues. Several factors contribute to relay failure in the G35:

1. Heat and vibration. The engine compartment subjects relays to constant heat and vibration, which can weaken internal solder joints over time.

2. Electrical overload. A failing fuel pump can draw excessive current, overheating the relay contacts and causing them to weld together or burn open.

3. Corrosion. Moisture entering the fuse box can corrode relay terminals, creating high resistance and eventual failure.

4. Age. Relays are mechanical components. The internal spring and contacts wear out over years of use. A 2006 vehicle is now nearly two decades old, so the original relay may simply be at the end of its service life.

Replacing the Fuel Pump Relay on Your 2006 G35

Replacement is straightforward and requires no special tools. Here is the complete process:

1. Purchase a replacement relay. You can buy a new relay from auto parts stores, online retailers, or the dealership. The cost is modest, making this one of the cheapest repairs you can perform on a G35.

2. Disconnect the negative battery cable. This prevents any accidental shorts while working in the fuse box.

3. Remove the old relay. Grip it firmly and pull straight upward. It should come out with moderate resistance. If it feels stuck, gently rock it back and forth while pulling.

4. Inspect the fuse box socket. Check for corrosion, burnt plastic, or bent pins. If you see damage, the fuse box itself may need attention.

5. Install the new relay. Align the prongs with the socket and press down firmly until it clicks into place.

6. Reconnect the battery and test. Turn the ignition to "ON" and listen for the fuel pump prime. Then start the engine and confirm normal operation.

When the Relay Is Not the Problem

If replacing the fuel pump relay does not fix your issue, the problem may be elsewhere in the fuel delivery system. Other common culprits include:

  • A blown fuse in the fuel pump circuit. Check fuse number 50 (15A) and replace if blown.
  • A faulty fuel pump itself. The pump may have worn brushes, a seized motor, or a failed check valve.
  • Wiring harness damage. Corroded or broken wires between the relay, fuse box, and fuel pump can interrupt power delivery.
  • A bad ground connection. Poor grounding at the fuel pump can prevent it from operating.
  • The anti-theft system. If the factory security system malfunctions, it can disable the fuel pump circuit.

A fuel pressure gauge test will tell you whether the pump is delivering adequate pressure. On the 2006 G35, the fuel pump should produce approximately 43 PSI. If pressure is low or zero, either the pump is weak, the fuel filter is clogged, or there is a wiring issue.

Preventing Future Fuel Pump Relay Failures

Taking a few preventive steps can extend the life of your new relay:

  1. Keep the fuse box cover sealed. This prevents moisture and dirt from entering the relay sockets.
  2. Address fuel pump issues early. If you notice your G35 is sluggish or hard to start, check fuel pressure before the problem destroys the relay.
  3. Use quality replacement parts. Cheap relays may not handle the current draw consistently. Stick with reputable brands.
  4. Inspect the relay annually. During routine maintenance, pull the relay and check for signs of overheating, such as discoloration or a burnt smell.

Choosing a Quality Fuel Pump for Your 2006 G35

If testing confirms your fuel pump is failing, you will need a replacement that meets or exceeds factory specifications. When you shop for a new fuel pump, look for one that offers reliable performance, direct fitment, and long-term durability. This is where KEMSO stands out as a trusted choice.

KEMSO specializes in high-performance fuel pumps that are designed as direct OEM replacements. Each pump is engineered to match the exact specifications of your vehicle, so you get a precise fit without modifications. KEMSO fuel pumps are built with quality materials and undergo rigorous testing to ensure consistent fuel delivery and reliable operation under demanding conditions. Whether you are driving your G35 as a daily commuter or pushing it hard on the weekends, KEMSO pumps deliver the fuel flow your engine needs.

One of the standout benefits of choosing KEMSO is the lifetime warranty that comes with every pump. This coverage gives you peace of mind, knowing that your investment is protected for as long as you own your vehicle. If a KEMSO fuel pump ever fails, the company stands behind its product and will replace it. This lifetime coverage is rare in the aftermarket parts industry and speaks to the confidence KEMSO has in its manufacturing quality.

You can view the full lineup of KEMSO fuel pumps and find the correct application for your 2006 Infiniti G35 by visiting the official website at https://www.kemsoracing.com/. The site provides detailed product descriptions, application guides, and customer reviews to help you select the right pump with confidence.

Final Thoughts

The 2006 Infiniti G35 fuel pump relay is a small component that can cause big headaches when it fails. Knowing its exact location — in the engine compartment fuse box near the battery — and understanding how to test and replace it can save you time and money. Always start with the relay when your G35 shows signs of fuel delivery problems; it is the easiest and cheapest fix to rule out before moving on to more expensive repairs like the pump itself.

Remember these key points:

1. The fuel pump relay is in the engine compartment fuse box, labeled clearly on most models. If you cannot find the label, check the fuse box cover diagram or your owner's manual.

2. A simple relay swap test takes five minutes and can confirm whether the relay is faulty. Use a relay with the same part number for accurate results.

3. If the relay tests good, check the fuel pump fuse before condemning the pump. A blown fuse is a quick, affordable fix.

4. Fuel pump failure symptoms are often mistaken for relay failure. If the relay is fine, test fuel pressure before buying a new pump.

5. When you do need a new fuel pump, KEMSO offers high-performance, OEM-replacement options with a lifetime warranty. Visit https://www.kemsoracing.com/ to browse the selection and find the right pump for your G35.

Taking a systematic approach to diagnosing your fuel system will save you from unnecessary expenses and get your 2006 Infiniti G35 back on the road faster. Start with the relay, check the simple things first, and always use quality replacement parts. For a dependable fuel pump upgrade, KEMSO provides the performance and peace of mind you need — backed by a lifetime warranty and available at https://www.kemsoracing.com/.

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