Changing Fuel Filter On 2007 Lbz Duramax: Step-By-Step Guide

Changing the fuel filter on a 2007 LBZ Duramax is a relatively straightforward process that can be done in a few simple steps. First, locate the fuel filter on the passenger side of the engine, below the air intake tube. Disconnect the centre air intake tube and the passenger-side inner fender for easy access. Next, disconnect the water-in-fuel sensor electrical connector and remove the fuel filter by rotating it counter-clockwise. Be careful not to spill any fuel. Drain the old filter and remove the water-in-fuel sensor assembly, replacing the O-ring. Lubricate the new O-rings with clean engine oil and install the new fuel filter, ensuring the water-in-fuel sensor connector is not entangled. Locate and open the bleed valve and repeatedly pump the plunger until diesel fuel begins to flow out. Close the bleed valve, clean up any spills, and reinstall the inner fender and intake tube. Start the engine and check for leaks.

The fuel filter is located on the passenger side of the engine

The fuel filter on a 2007 LBZ Duramax is located on the passenger side of the engine. This is also the case for the Duramax engine models from 2001 to 2016.

To access the fuel filter, you will need to

Disconnect the wire that goes from the water in the fuel sensor

Disconnecting the wire that goes from the water in the fuel sensor is a crucial step when changing the fuel filter on a 2007 LBZ Duramax. Here is a detailed guide on how to do this:

First, locate the fuel filter. It is found on the passenger side of the engine, below the air intake tube. To access it, you will need to remove the centre air intake tube between the air filter housing and the turbocharger inlet mouthpiece. You may also need to remove the passenger side inner fender, which is secured by plastic body clips.

Once you have located the fuel filter, the next step is to disconnect the water-in-fuel sensor electrical connector. This will involve carefully detangling the wire from the sensor. It is important to keep the filter positioned upright during this process to avoid spilling any fuel.

After disconnecting the wire, you can proceed to remove the fuel filter by rotating it counter-clockwise. Again, be cautious not to spill any fuel. Once the filter is removed, drain it and inspect the gasket to ensure it did not stick to the fuel filter housing flange.

At this point, you can remove the water-in-fuel sensor assembly from the bottom of the fuel filter using a wrench, socket, or pliers. Be gentle as the sensor assembly is made of plastic and can crack or strip. If the assembly is damaged, do not reuse it.

Now that the wire from the water-in-fuel sensor is disconnected, you can proceed with the rest of the fuel filter replacement process, including installing a new filter and priming the fuel system. Remember to dispose of any drained fuel properly and to clean up any spills to easily detect leaks.

Remove the fuel filter

To remove the fuel filter from your 2007 LBZ Duramax, you will need to gather a few tools and materials. These include a panel clip remover, a Water In Fuel (WIF) sensor wrench (or channel locks) and a

Lubricate the O-rings of the new filter

Lubricating the O-rings of the new filter is a crucial step in ensuring a proper seal and preventing fuel leaks. Here is a detailed guide on how to lubricate the O-rings when changing the fuel filter on a 2007 LBZ Duramax engine:

• Prepare the O-rings: Before lubrication, it is essential to inspect the O-rings for any damage or wear. Ensure they are in good condition and sit securely in their grooves. If the O-ring appears stretched, you can place it in the freezer for a few minutes to help it shrink back to its original size.
• Choose a suitable lubricant: Various lubricants can be used on the O-rings, including engine oil, diesel fuel, ATF (automatic transmission fluid), grease, or even vaseline. It is recommended to use clean engine oil or diesel fuel for this purpose. Avoid using penetrating fluids like WD-40 as they may potentially soften the O-ring material.
• Apply the lubricant: Take a small amount of your chosen lubricant and apply a thin coat to the O-rings. You can use a clean finger, a small brush, or a cotton swab for this step. Ensure that the lubricant covers the entire surface of the O-ring.
• Install the new filter: With the O-rings lubricated, you are now ready to install the new fuel filter. Carefully place the lubricated O-ring onto the new fuel filter, ensuring it sits securely in its groove. Do not overtighten the O-ring, as this can cause damage. A light coating of lubricant will help the O-ring slide into place as you tighten it.
• Check for leaks: Once the new fuel filter is installed, start the engine and carefully inspect for any fuel leaks. Leaks may indicate that the O-ring is not seated correctly or may be damaged. If a leak is detected, re-inspect the O-ring and ensure it is properly lubricated and installed.

Remember, a well-lubricated O-ring ensures a proper seal and helps prevent excessive wear and strain on the fuel system. Always take your time and work carefully to ensure a successful fuel filter change on your 2007 LBZ Duramax engine.

Reinstall the water in the fuel sensor

To reinstall the water in the fuel sensor, follow these steps:

Firstly, lubricate the water-in-fuel sensor o-ring with clean engine oil. Then, install the sensor snugly onto the new fuel filter. Ensure that you do not overtighten it. Next, lubricate the new fuel filter gasket with clean engine oil and install it at the top of the fuel filter assembly.

Now, install the replacement fuel filter, ensuring that the water-in-fuel sensor connector does not become entangled with its surroundings. Install it snugly by hand only, do not tighten it with tools.

After this, locate and open the bleed valve towards the driver's side of the fuel priming pump. If desired, you can remove the bleed screw for inspection of the o-ring.

Finally, repeatedly pump the plunger on the top of the fuel filter housing until all air escapes and diesel fuel begins to flow out of the bleed screw orifice. Immediately close the bleed screw, ensuring that you do not overtighten it, as the screw is made of plastic. Clean up any spills so that leaks can be easily detected.

Frequently asked questions