Replacing Fuel Pressure Regulator In Infiniti G35x: Step-By-Step Guide

If you notice that your 2006 Infiniti G35X is getting poor mileage, has gas leaking, has black smoke coming out of the exhaust, or isn’t running smoothly, you may need to replace the fuel pressure regulator. The fuel pressure regulator controls the fuel pressure and returns any excess fuel to the tank, ensuring the injectors operate properly. The cost of this replacement will vary depending on your location, but on average, it will cost $372, with $78 for parts and $294 for labor.

There are many online guides and videos that can show you how to replace the fuel pressure regulator yourself. However, if you feel uncomfortable working on your vehicle, it is best to contact a mechanic.

Remove the engine cover and vacuum line

To remove the engine cover and vacuum line of your 2006 Infiniti G35x, start by opening the hood and removing the engine cover. Then, remove the vacuum line that connects the plenum to the battery cover area. This will give you some good working space.

Looking down between the strut tower and the engine, you will see a bracket that holds two fuel lines to the body. Remove those two bolts (10mm—a ratcheting wrench is recommended). Then, unlock the clip that fastens the fuel damper line to the bracket. Push the now loosened bracket toward the back of the car so that it stays out of the way and doesn't hinder your work.

Use a long screwdriver to remove the green clip that holds the bottom of the fuel damper line to the connecting fuel line. Simply push down on it and it should come right off. Keep a shop towel handy to catch any minor fuel leakage.

Remove bolts and unlock the clip fastening the fuel damper line

To remove the bolts and unlock the clip fastening the fuel damper line, you'll need to follow these steps:

First, open the hood and remove the engine cover. Then, remove the vacuum line that connects the plenum to the battery cover area. This will give you some good working space.

Looking down between the strut tower and engine, you'll see a bracket that holds two fuel lines to the body. Remove the two bolts (10mm- a ratcheting wrench is recommended). Then, unlock the clip that fastens the fuel damper line to the bracket. Push the now loosened bracket toward the back of the car so that it stays out of the way.

Use a long screwdriver to remove the green clip that holds the bottom of the fuel damper line to the connecting fuel line. It should come off with a push. Unbolt the top of the fuel damper hose. A 10mm socket with a small extension is best for this. Keep a shop towel handy to catch any minor fuel leakage.

Jack up the passenger side of the car high enough to crawl under. Remove the lower connection from under the car. Push the green tabs together (top and bottom) and push the connector off. The green "lock" will stay on, but the larger black piece will slide off with some effort while holding those tabs down. Keep a rag handy, as some fuel will drain out.

The installation is the reverse of the removal process.

Push the bracket towards the back of the car

To replace the fuel pressure regulator on a 2006 Infiniti G35X, you'll need to push the bracket towards the back of the car to keep it out of the way. Here's a step-by-step guide to help you through the process:

Step 1: Open the hood and remove the engine cover.

Step 2: Remove the vacuum line that connects the plenum to the battery cover area. This will give you more space to work with.

Step 3: Locate the bracket that holds the two fuel lines to the body. It should be visible when you look down between the strut tower and the engine.

Step 4: Remove the bolts from the bracket. Typically, these are 10mm bolts, and you can use a ratcheting wrench to remove them.

Step 5: Unlock the clip that secures the fuel damper line to the bracket.

Step 6: Now, push the loosened bracket towards the back of the car. This step is crucial to ensure that the bracket doesn't get in the way of your work.

Step 7: Use a long screwdriver to remove the clip holding the bottom of the fuel damper line to the connecting fuel line.

Step 8: Unbolt the top of the fuel damper hose using a 10mm socket with a small extension. Have a shop towel ready to catch any minor fuel leaks.

Step 9: Jack up the passenger side of the car so you can crawl underneath. From this position, it will be easier to remove the lower connection.

Step 10: Push the green tabs together (both top and bottom) and detach the connector. Some fuel will drain out, so keep a rag handy.

By following these steps, you'll be able to access and replace the fuel pressure regulator on your 2006 Infiniti G35X, ensuring a proper fuel pressure and optimal engine performance.

Remove the bottom of the fuel damper line

To remove the bottom of the fuel damper line, you will need to jack up the passenger side of the car high enough to crawl under. Keep a shop towel handy to catch some minor fuel leakage.

You will need to push the green tabs together (top and bottom) and push the connector off. The green "lock" will stay on, but the larger black piece will slide off with some effort while holding those tabs down. Beware that some fuel will drain out here, so keep a rag handy. This step can be tricky, so take your time. Push both tabs, then rotate the hose so they stay open and then push the hose off. Once the hose is off, pull off the green lock and replace it with a new one.

The bottom connection can be difficult to unclip from underneath the car. A useful trick is to use a large flat-head screwdriver. Stick it where you have to push down on the green part and turn the screwdriver to force the hose down from the green clip.

Disconnect the fuel line from the regulator

To disconnect the fuel line from the regulator, you will need to first clear the passenger side of your VQ35DE engine. This will involve undoing the plastic clips that hold your engine wiring harness in place on the passenger side.

Once you have these harnesses pushed aside and have gained the proper clearance, go ahead and undo the 10mm bolts that hold your primary fuel pressure regulator in place. Make sure to use the proper eye wear and protection as the fuel in this line is under high pressure.

At this point, you can disconnect the fuel line from the regulator. You can either try to remove the fuel line from the regulator or disconnect the line from the junction on the frame. If you choose to remove the fuel line from the regulator, be very careful not to tear, pinch or otherwise damage the line. If you do, you must replace it with a fuel-rated line to avoid failure.

If you are disconnecting the line from the junction on the frame, use a long screwdriver to remove the green clip that holds the bottom of the fuel damper line to the connecting fuel line. Push down on the clip and it should come right off.

Once the fuel line is disconnected from the regulator, you can remove the regulator from the car.

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