Ameer Randolph
Bleeding the fuel lines on a Duramax engine can be a tricky task. The process involves removing air bubbles from the fuel system, which can cause issues with engine performance and starting. Various methods can be used to bleed the fuel lines, such as using a lift pump to prime the system or manually pumping the filter housing. Additionally, factors like the weather and the type of fuel filter used can impact the effectiveness of the bleeding process. With the right tools and knowledge, Duramax owners can successfully bleed their fuel lines and ensure their trucks run smoothly.
How to bleed fuel lines on a Duramax
| Characteristics | Values |
|---|---|
| Cause of air in fuel lines | Weak, kinked, or restricted original fuel lines |
| Solution | Replace the fuel filter housing |
| Steps to replace fuel filter housing | 1. Pump the primer bulb until hard 2. Crack the bleeder screw open 3. Repeat until solid fuel with no air comes out of the bleeder 4. Close bleeder screw 5. Prime the lines until fuel squirts out 6. Drive for a few minutes 7. Turn on the lift pump |
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What You'll Learn
Pump the filter housing
Pumping the filter housing is a crucial step in bleeding the fuel lines on a Duramax engine. This process helps to remove air from the fuel system, ensuring that only solid fuel passes through. Here's a detailed guide on how to pump the filter housing effectively:
Firstly, locate the bleeder screw on the filter housing. This screw plays a vital role in bleeding the air from the system. Before starting the pumping process, ensure that the bleeder screw is closed tightly. This prevents any air from entering the system during the pumping process.
Next, begin pumping the primer bulb or plunger on the filter housing. The primer bulb is usually located on top of the OEM filter head. Pump it vigorously and repeatedly until you feel resistance and it becomes challenging to push down. This indicates that the system is building up pressure and the air is being forced out.
Once the primer bulb is hard to push down, it's time to crack open the bleeder screw slightly. Be careful not to open it too wide, as this may release too much pressure. With the bleeder screw slightly open, continue pumping the primer bulb. You may notice that fuel starts to squirt out, which is a good sign. It indicates that the air is being purged from the system.
Repeat the process of pumping the primer bulb and cracking the bleeder screw until you achieve a consistent flow of solid fuel without any air bubbles. This step may take several attempts, and it's important to be patient and persistent. Remember to close the bleeder screw before pumping to maximize pressure.
Finally, after achieving a solid fuel flow, tighten the bleeder screw securely. At this point, you can start the engine and let it run for a few minutes. Observe the engine's performance and ensure that it runs smoothly without any issues related to fuel delivery. If necessary, you can also check the fuel pressure at the port on the engine to ensure it's within the optimal range.
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Check for leaks
After performing maintenance on your Duramax, such as changing the fuel filter or installing new injectors, it is important to check for leaks to ensure that your fuel system is functioning properly. Here are the detailed steps to follow:
First, locate the fuel lines under the truck, near the tank. Look or feel for any residue that may indicate a leak. Check the nylon flex lines on the side of the engine, as well as any rusty spots along the frame behind the wheel. Make sure that the filter is secure and not loose, as a loose filter can cause air to enter the system.
Next, inspect the fuel filter housing for any signs of damage or warping. A warped fuel filter housing can cause leaks and allow air to enter the system. If you notice any issues with the housing, it may need to be replaced.
If your Duramax has a lift pump, you can use it to prime the system and check for leaks. Crack the bleeder screw, turn on the lift pump until solid fuel squirts out, and then close the bleeder screw. If your fuel rail was empty or contained air, give the plunger a few more pumps until it becomes hard after closing the bleeder screw.
After making any necessary adjustments or repairs, start the truck and run it for a few minutes. Then, shut off the truck and check the fuel pressure at the port on the engine. Ensure that the fuel pressure is within the normal range and that there are no leaks present.
Finally, if you have recently changed the OEM filter, you can use the pumps to prime the system or the plunger on top of the OEM filter head. Running the truck with the pump(s) disengaged for a few minutes will help identify any leaks and ensure that all the air has been removed from the system.
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Replace the fuel filter housing
To replace the fuel filter housing on a Duramax, you'll need to first locate the fuel filter. On a 2001-2016 Silverado or Sierra HD, the fuel filter is on the passenger side of the Duramax, below the air intake tube.
The first steps are to remove the centre air intake tube between the air filter housing and the turbocharger, and then to remove the passenger side inner fender. Next, open the bleed screw at the top of the fuel filter housing, and then open the water separator drain valve. Drain the water/fuel into a container and then properly dispose of it. Disconnect the water-in-fuel sensor electrical connector.
Rotate the fuel filter counter-clockwise (from the bottom) and then remove it. Keep the filter positioned upright to avoid spilling any remaining fuel. Drain the remaining fuel out of the fuel filter and then dispose of the fuel. Make sure that the old gasket isn’t stuck to the fuel filter head. With a wrench, deep socket, or pliers, remove the water-in-fuel sensor assembly from the bottom of the filter.
If the new fuel filter comes with an o-ring for the water-in-fuel sensor assembly, replace the old one with the new one. If the water in the fuel sensor assembly is damaged, it should also be replaced with a new one.
Finally, install the replacement fuel filter, ensuring that the water-in-fuel sensor connector does not become entangled. Install by hand only, do not tighten with tools. 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.
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; do not overtighten, the screw is plastic. Clean up any spills so that leaks can be easily detected.
Start the engine and check for leaks. If the engine runs rough for an extended period, turn off the engine, re-bleed the system at the fuel filter housing, and check for leaks again.
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Check nylon flex lines
When bleeding fuel lines on a Duramax, it is important to check the nylon flex lines for any signs of damage or wear. These lines are located on the side of the engine, and it is common for them to develop cracks or leaks over time, especially in the original fuel line ends. This can cause air to enter the system and lead to issues with the fuel pressure.
To check the nylon flex lines, start by visually inspecting the lines for any signs of damage, such as cracks, kinks, or leaks. If the lines appear damaged, they should be replaced. Even small cracks can lead to problems with fuel pressure, as the system relies on vacuum pressure to pull fuel out of the tank.
Feel along the lines for any residue or fuel buildup, as this can also indicate a leak. Pay close attention to the connections and fittings, as leaks often occur at these points. If the lines are damaged or leaking, replace them before continuing with the bleeding process.
In addition to checking the nylon flex lines, it is also important to inspect the fuel filter housing for any signs of damage or wear. The fuel filter housing is another common source of leaks, and it may need to be replaced if it is cracked or warped. A warped fuel filter housing can cause the system to lose pressure and affect the overall performance of the engine.
By regularly inspecting and maintaining the nylon flex lines and fuel filter housing, you can help ensure that your Duramax's fuel system is functioning properly and prevent issues with air and fuel pressure.
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Prime the system
To prime the system, you can use a lift pump if your Duramax is equipped with one. Start by cracking the bleeder screw, then turn on the lift pump until solid fuel squirts out. Close the bleeder screw, and if your fuel rail was empty or had air in it, give the plunger a few more pumps until it gets hard.
If your Duramax does not have a lift pump, you will need to do this process by hand. Pump the primer bulb until it gets so hard you have trouble pushing it down, then crack the bleeder screw open. Repeat this process until you get solid fuel and no air out of the bleeder.
If your Duramax has a filter/primer housing that is damaged or cracked, you will need to replace it. This is a common issue with these trucks, as the nylon flex lines can get rusty and the housing can crack, causing air to enter the system.
It is important to note that if you have a Kennedy lift pump, you should not use it to prime your system, as it will ruin it.
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Frequently asked questions
To bleed the fuel lines on a Duramax, you need to check for air in the system, prime the lines, and then drive for a few minutes. You can do this by cranking the engine and then pumping the filter housing.
If your Duramax is not starting, stalling, or bleeding bubbles from the fuel filter, it may need bleeding. Check for residue on the lines under the truck by the tank, as this could indicate a leak.
The original ends of the fuel lines can get weak and restrict flow, causing bubbles. The fuel filter housing could also be damaged or warped, which would need to be replaced.
To bleed air out of the fuel lines, crack the bleeder screw, turn on the lift pump until solid fuel comes out, and then close the bleeder screw. You may need to repeat this process several times.
