Katerina Swanson
Water in your Duramax fuel filter is usually the result of contaminated fuel. This can be addressed by opening the petcock at the bottom of the fuel filter, without removing the fender liner. However, some Duramax models have difficult access to the filter, requiring the removal of the passenger-side front wheel liner to reach the filter from the bottom. Once accessed, the drain cock can be opened using channel locks, and an empty water bottle can be used to collect the drained fluid. Draining should continue until the fluid runs clear.
How to Drain Water from Duramax Fuel Filter
| Characteristics | Values |
|---|---|
| Cause | Usually occurs when buying contaminated fuel |
| Tools | Channel locks, pliers, screwdrivers |
| Steps | 1. Unplug the wire. 2. Use channel locks to open the drain cock/petcock/wing nut-type valve at the bottom of the filter. 3. Drain until clear fuel comes out. 4. Carefully tighten the drain. 5. Open the bleeder screw on the filter head and use the primer bulb until solid fuel comes out. |
| Tips | 1. Use an empty water bottle to see what is being drained. 2. Check the fuel filter regularly, especially during the rainy season. 3. Buy fuel from the same place to ensure clean fuel. |
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What You'll Learn
Drain water from the bottom of the fuel filter
To drain water from the bottom of the fuel filter, you must first locate the petcock or drain valve at the base of the filter. This is usually a "wing nut"-type valve with a drain tube in the centre.
You can try turning it counter-clockwise to open it, but be careful not to use excessive force as you may risk cracking the valve. If it doesn't open easily, you may need to use a tool to gain leverage, but again, be cautious not to damage the valve.
Once the valve is open, you can drain the water. It's a good idea to use an empty bottle to collect the drained liquid so you can inspect it. The water will likely be brown and dirty, and you should continue draining until you see clear fuel coming out.
After draining, carefully tighten the valve, being careful not to over-tighten, as this could make it difficult to open in the future.
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Use a water bottle to see what you're draining
When draining water from your Duramax fuel filter, it is important to be able to see what you are draining. One way to do this is by using an empty water bottle. This method is recommended because it allows you to see the colour of the liquid being drained, which will help you determine if it is water or fuel.
To use this method, place the empty water bottle under the drain cock of the fuel filter. Open the drain cock using a pair of channel locks. The water will then start to drip out of the fuel filter and into the water bottle.
You are likely to see brown and nasty-looking water coming out of the filter at first. Continue draining until the liquid in the bottle becomes clear, indicating that you are now draining fuel instead of water. At this point, you can carefully tighten the drain cock and move on to the next step of bleeding the fuel filter.
Using a water bottle to catch the drained liquid is a simple and effective way to visually inspect what you are draining from your Duramax fuel filter. It helps ensure that you have successfully removed the water from the filter and can provide peace of mind that your fuel system is free of contamination.
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Drain until you see clear fuel
If you're experiencing issues with water in your Duramax fuel filter, it's likely due to contaminated fuel purchased from a fuel station. To resolve this, you'll need to drain the water from the fuel filter. Here's a step-by-step guide:
Step 1: Access the Fuel Filter
Locate the fuel filter and ensure you can reach it without removing any components. On some Duramax models, you may need to drop the passenger side front wheel liner to access the fuel filter from the bottom.
Step 2: Unplug the Wire and Open the Drain Cock
Unplug the wire connected to the fuel filter. Use a pair of channel locks to open the drain cock, which is typically located at the bottom of the fuel filter.
Step 3: Drain the Water
Place an empty water bottle under the drain cock to collect the drained fluid. The water is likely to be discoloured and dirty. Continue draining until you see clear fuel being drained out. It is important to ensure that all the contaminated fuel is removed.
Step 4: Close the Drain Cock
After draining, carefully tighten the drain cock, being cautious not to overtighten it as this may cause cracking.
Step 5: Bleed the Fuel System
Go to the top side of the filter and locate the bleeder screw on the filter head. Open the bleeder screw and use the primer bulb until you see solid fuel coming out, free of any water or contaminants.
Step 6: Reassemble and Test
Reassemble any components that were removed during the process. Start the engine and observe if the "water in fuel" message has disappeared. Your Duramax should now be operating without any issues related to water in the fuel.
Remember to practice safety and wear appropriate protective gear when performing any maintenance on your vehicle. It is also recommended to consult a professional if you are unsure about any steps or procedures.
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Tighten the drain carefully
When tightening the drain, it is important to be cautious and careful. This is because the drain valve, often described as a "wing nut" type valve, can be tight and difficult to open. One user even reported that they were unable to turn it counterclockwise at all, despite their efforts. Therefore, it is crucial to avoid over-tightening the drain to prevent cracking it.
To tighten the drain carefully, you can follow these steps:
- Use a pair of channel locks to gently snug up the drain. Avoid using excessive force to prevent damage.
- Ensure that the drain is securely tightened but not overly tightened. Over-tightening can make it challenging to loosen the drain in the future and may increase the risk of cracking.
- Check that the drain is properly aligned and seated before proceeding to the next steps.
- Once tightened, move on to the next steps in the fuel filter draining process, such as opening the bleeder screw and priming the bulb.
It is important to note that accessing the drain valve can vary depending on the model and generation of your Duramax engine. Some users have reported easier access from the bottom, while others have had to remove the passenger side front wheel liner or pull the fender well to reach the drain valve. Understanding the specific layout of your engine will help you locate and tighten the drain more effectively.
Remember, it is always recommended to consult a professional mechanic or refer to the Duramax Supplement Manual for detailed instructions on draining water from the fuel filter.
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Find the bleeder screw and open it
To drain water from the fuel filter of your Duramax, you must first locate the bleeder screw. This can be found on the filter head, which is situated on the top side of the filter. Once you have located the bleeder screw, you need to open it. This will involve using a tool to loosen it, as it is likely to be tight. A pair of channel locks or pliers can be used for this purpose. Be careful not to apply too much force, as you do not want to crack the screw or damage the surrounding area.
Once the bleeder screw has been opened, you will need to use a primer bulb until solid fuel starts to come out. This process will help to clear any remaining water from the system and ensure that your engine is running on pure fuel. It is important to take your time during this step and not to rush, as you want to ensure that all the contaminated fuel has been drained and replaced with fresh, clean fuel.
After you have completed the bleeding process and are satisfied that only solid fuel is coming out, you can move on to the final step of reassembling the filter. This involves carefully tightening the bleeder screw back into place and ensuring that all other components are securely fastened. Once everything is in place, you can start your engine and ensure that it is running smoothly.
By following these steps and paying attention to the details, you can effectively drain water from your Duramax fuel filter and maintain the optimal performance of your engine. Remember to consult a professional or a trusted mechanic if you have any doubts or concerns during the process.
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Frequently asked questions
You will receive a "water in fuel" message on your DIC.
You should stop driving and change the fuel filter. You can also try draining the water by opening the petcock on the bottom of the fuel filter.
First, unplug the wire and use a pair of channel locks to open the drain cock. Drain the water until you see clear fuel coming out. Then, carefully tighten the drain cock and open the bleeder screw on the filter head. Use the primer bulb until solid fuel comes out.
