Katerina Swanson
If you're experiencing issues with your Nissan Patrol, such as warning lights, engine spluttering, or poor performance, it may be necessary to drain and change the fuel filter. This process involves several steps, including draining diesel from the old filter, disconnecting fuel hoses and wiring, inspecting and replacing O-rings, installing a new filter, priming the filter, and reconnecting components. Some users have reported issues with priming the filter, which may be due to air leaks or a faulty primer pump. It's important to be cautious when handling fuel and to refer to specific guides or videos for a comprehensive understanding of the process.
| Characteristics | Values |
|---|---|
| Water in the fuel filter | Drain the water by undoing the tap under the filter |
| Air in the system | Find the source of the air leak and fix it |
| Priming the fuel filter | Use an air compressor to pump air into the tank while the hose from the filter to the IP is off |
| Draining diesel | Jack up the rear of the vehicle, place it on stands with the passenger side slightly higher, and fit a jerry can under the vehicle to catch the diesel |
| Fuel filter change | Undo the fuel lines, unplug the wires, remove the old filter, install the new filter, and prime it |
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What You'll Learn
Draining diesel from the old filter
First, locate the drain plug at the bottom of the fuel filter. Place a clean container underneath the filter to catch the diesel. Undo the drain plug by turning it a few times, allowing the diesel to drain out. You may need to use a tool such as an oil filter wrench if the filter is screwed on tightly.
Once the diesel has finished draining, you can move on to the next steps of changing the fuel filter. It is important to be cautious and avoid spilling fuel during this process.
If you are experiencing issues with water in the fuel filter, there are additional steps you can take. After draining the diesel, you can pump the primer on top of the filter to push out any remaining water and fuel. Make sure to have a container underneath to catch the liquid.
It is also important to check for any air leaks in the system. Common problem areas include the primer pump, loose connections, or holes in hoses. Inspect all components thoroughly and address any leaks before reassembling the filter.
Additionally, consider purchasing a new top and bottom O-rings when changing the fuel filter. This will ensure a secure fit and prevent leaks.
By following these steps, you can effectively drain diesel from the old fuel filter of your Nissan Patrol and perform necessary maintenance to keep your vehicle running smoothly.
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Disconnecting the fuel lines
Before beginning, ensure you have the necessary tools and safety equipment, such as gloves and eye protection. Place a container under the fuel filter to catch any fuel or water that may drain out.
Firstly, identify the fuel lines connected to the filter. There should be two fuel hoses connected to the filter. One of these hoses will be the fuel supply line, and the other will be the return line. It is important to label or mark these lines to ensure proper reconnection later.
Next, carefully loosen and disconnect the fuel lines from the filter. This can be done by using the appropriate size wrench or tool to loosen any clamps or fittings holding the hoses in place. Be cautious not to damage the hoses or the filter during this process. Once the lines are disconnected, it is a good idea to block or cap them to prevent any fuel spillage and to ensure no dirt or debris enters the lines.
After disconnecting the fuel lines, you may need to remove the fuel filter by unscrewing it or detaching it from its mounting bracket. This step may vary depending on the specific model of your Nissan Patrol and the location of the fuel filter.
In some cases, you may need to disconnect additional components, such as the primer pump assembly or the water sensor, which are often located near the fuel filter. Always refer to a trusted repair manual or seek advice from a qualified mechanic if you are unsure about any steps.
Remember to exercise caution when working with fuel lines and filters to avoid any spills or accidents. Ensure that the work area is well-ventilated and free from any potential ignition sources.
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Priming the new filter
When priming the new filter, ensure that the little O-ring is still in the housing, then tighten. Do not overtighten the filter. Reinstall the primer pump assembly, reconnect the water sensor, and place a fuel container under the right-hand side of the primer pump. Remove the bolt from the left fuel hose and connect it to the primer pump.
Now, prime the filter. To do this, squeeze the hand pump bellows and block the filter outlet with your thumb. Allow the bellows to expand, which will draw fuel from the tank and push fuel through the filter. Release your thumb and squeeze the pump bellows to check for fuel. Repeat this process until fuel appears, then connect the fuel pump rubber hose to the filter outlet.
If you have an air compressor, try pumping air into the tank while the hose from the filter to the IP is off. You can wrap a rag around the air nozzle. The priming is complete when the priming button feels almost solid. You can also kick the button and keep pumping the primer for a minute to keep the juice flowing if you're unsure if it's 100% bled.
Before you screw the new filter on, pour a bottle of injector cleaner into the filter. Then, prime the filter and run the engine for about five minutes.
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Bleeding the fuel filter
Step 1: Locate the Drain Plug
Begin by locating the drain plug at the bottom of the fuel filter. This plug provides access to drain the fuel and remove any contaminants, such as water or dirt.
Step 2: Prepare for Draining
Place a suitable container underneath the fuel filter to collect the drained fuel. Ensure that the container is clean and can safely hold the drained fuel.
Step 3: Open the Drain Plug
Using the appropriate tool, carefully open the drain plug by turning it a few times. This will allow the fuel and any water present to start draining out. Be cautious and try to control the flow rate to avoid spills.
Step 4: Pump the Primer
With the drain plug open, locate the primer on top of the fuel filter. Start pumping the primer to facilitate the removal of fuel and water from the filter. The primer creates pressure that pushes the contents out through the drain plug.
Step 5: Check for Water
As the fuel and water exit the filter, pay close attention to the colour and consistency of the drained fluid. Look for any signs of water contamination, which may appear as blobs or discolouration in the fuel.
Step 6: Close the Drain Plug
Once the fuel and water have been drained, tighten the drain plug securely. Ensure that it is properly closed to prevent any leaks or spills during the next steps.
Step 7: Refill and Prime the Filter
Refill the new fuel filter with clean diesel fuel. Ensure that the water sensor is installed correctly. Prime the filter by following the standard priming procedure for your Nissan Patrol. This typically involves using a hand pump to draw fuel from the tank and push it through the filter.
Step 8: Reinstall the Filter
After priming, carefully reinstall the new fuel filter, ensuring that all connections are secure and tight. Refer to your Nissan Patrol's specific instructions for any unique considerations when reinstalling the filter.
Step 9: Start the Engine
With the new fuel filter installed, start the engine and let it idle. Observe the engine's performance and listen for any unusual noises. If the engine idles smoothly, you can proceed to the next step.
Step 10: Test Drive
Finally, take your Nissan Patrol for a short test drive. Drive around 10 kilometres to ensure that the new fuel filter is functioning correctly and that there are no issues with fuel flow or engine performance.
Remember to always exercise caution when working on your vehicle. Refer to your Nissan Patrol's specific maintenance guidelines and consult a qualified mechanic if you have any doubts or concerns during the process of bleeding and replacing the fuel filter.
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Reinstalling the primer pump assembly
To reinstall the primer pump assembly, first, ensure that the little o-ring is still in the housing. Then, tighten the new filter, being careful not to overtighten it. Next, reconnect the water sensor and place a fuel container under the right-hand side of the primer pump.
Remove the bolt from the left fuel hose and connect it to the primer pump. Now, prime the pump until fuel comes out constantly into the container. This may take a few attempts, so be patient and keep trying. You can check if it is primed by twisting the sub-tank fuel cap—if it is fully primed, the priming button will feel almost solid.
Once the pump is primed, you can reconnect the fuel hoses and ensure they are blocked with appropriately-sized bolts. Finally, bolt the mounting bracket in place and refit the two small return line rubber hoses.
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