Regan Brown
If you're looking to prime the fuel filter on your VW T5, there are a few methods you can try. The official service manual for VW T5 recommends using a VW-specific scan tool to enter basic settings and input 35 in the test window to run both electric fuel pumps and purge air from the system. However, some VW technicians shared that they simply fill the fuel filter canister with clean fuel. Another method is to fill the new filter with fresh diesel, perform 5-10 ignitions, and then start the vehicle. If it doesn't start, you can try cranking it over until it fires up. It's important to note that the replacement interval for the fuel filter is 120,000 km for countries with stable fuel quality and 40,000 km for countries with unreliable fuel quality.
VW T5 Fuel Filter Characteristics and Values Table
| Characteristics | Values |
|---|---|
| Fuel Filter Replacement Interval | 120,000 km for countries with stable fuel quality |
| Fuel Filter Replacement Interval | 40,000 km for countries with unreliable fuel quality |
| Fuel Filter Replacement Process | Disconnect the return pipe from the filter |
| Disconnect the fuel supply to the tandem pump | |
| Place a tube/pipe on the filter RT outlet and collect fuel | |
| Use the ignition to turn on the primary fuel pump | |
| Repeat the process a few times until fuel starts to flow | |
| Re-connect the pipes and tighten the connections | |
| Fill the new filter with fresh diesel | |
| Turn the ignition on and off a few times to pressurize the system | |
| Start the engine and crank if necessary | |
| Alternative Method | Use a VW-specific scan tool and enter basic settings |
| Run both electric fuel pumps to purge air from the system |
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$75
What You'll Learn
Using a vacuum to prime the fuel filter canister
The service manual also states that the fuel system should be filled (or primed) after the fuel system is opened up. However, it has been noted that many VW technicians do not follow the service manual. Many people simply fill the fuel filter canister with clean fuel, and it appears to work fine.
If you do not have access to a VW-specific scan tool, there are other methods to prime the fuel filter. One method is to siphon out the old fuel, add a small amount of fresh fuel, and slowly lower the filter. The lines running to the filter will self-prime. There is plenty of space between the filter and the HPFP and lines for fresh fuel to cycle in without any issues.
Another method is to fill the new filter with fresh diesel, then perform 5-10 ignitions to pressurize the system. If the system cuts out, crank it over until it fires up.
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Using a VW-specific scan tool to prime the fuel system
To prime the fuel system of a VW T5, one method is to use a VW-specific scan tool. The official service manual for these cars recommends using a VW-specific scan tool to prime the fuel system after any time that the fuel system is opened up.
The correct steps to prime the fuel system using a VW-specific scan tool are as follows:
- Use a VW-specific scan tool and go to "Basic Settings".
- Enter 35 in the test window.
- Run both electric fuel pumps to completely purge all air from the system.
The VW-specific scan tool method is considered the correct way to prime the fuel system, but some people debate the importance of this procedure. Some people just fill the fuel filter canister with clean fuel, and it appears to work fine. However, there may be a potential for damage if the system is not properly primed.
Another method to prime the fuel system without using a VW-specific scan tool is to fill the housing with fuel. This method has been debated, but some people have not noticed any issues with their cars after priming the system this way. Additionally, some people have mentioned that opening the driver's door and turning the key several times can help prime the filter.
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Bleeding the fuel system
Step 1: Disconnect the Return Pipe
Start by disconnecting the return pipe from the filter. This pipe is marked as "RT" and is usually located near the filter.
Step 2: Disconnect the Fuel Supply
Next, you need to disconnect the fuel supply to the tandem pump. This will involve detaching some tubes or pipes connected to the fuel system. Place a container, such as a jar or glass, below the pipes to collect any fuel that may spill.
Step 3: Use Ignition to Operate the Primary Fuel Pump
With the fuel supply disconnected, you can now use the ignition to turn on the primary fuel pump. Turn the key to the first position for 3 seconds, then switch it off. Repeat this process about 10 times. This step helps to initiate fuel flow from the tandem fuel pump supply pipe.
Step 4: Loosen the High-Pressure Outlet
After the fuel starts flowing, loosen the high-pressure outlet on the tandem fuel pump. You may need to unscrew this outlet slightly to get the pipe to move. Fuel should start dripping from the outlet after a few seconds.
Step 5: Re-tighten the High-Pressure Outlet
Once fuel is dripping from the high-pressure outlet, re-tighten this connection. Ensure that the connection is secure to prevent any leaks.
Step 6: Remove Air from the System
To ensure that all air is removed from the system, use the ignition again, turning it on and off about 5 times. You can observe the jar or container you placed below to check for any air bubbles. If there are no air bubbles, you have successfully removed the air from the system.
Step 7: Reconnect the Return Pipe
Finally, reconnect the return pipe to the filter. Make sure all connections are secure before starting the engine.
Some VW T5 owners have reported alternative methods for bleeding the fuel system. One method involves filling the new filter with fresh diesel, then performing 5-10 ignitions on and off to pressurize the system. Another approach is to use a vacuum to prime the fuel filter canister, as recommended by some VW mechanics. However, the official service manual suggests using a VW-specific scan tool to enter "basic settings" and run both electric fuel pumps to purge all air from the system.
Remember to refer to your VW T5's service manual for specific instructions and safety precautions before attempting any fuel system maintenance.
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Draining water from the filter
Draining water from the fuel filter of a VW T5 is a crucial step in maintaining optimal engine performance and preventing potential issues caused by water contamination. Here is a detailed guide on how to effectively drain water from the fuel filter:
First, locate the fuel filter and the return pipe connected to it. This pipe is marked as "RT." Before beginning any work, it is essential to have a safe and appropriate container to catch the drained fluid. Place a container under the RT pipe to collect the fluid that will be drained.
Next, disconnect the return pipe (RT) from the fuel filter. This step will allow you to access and drain the fluid inside. Be cautious and have a designated container ready to collect the fluid that may come out when the pipe is detached.
Once the return pipe is disconnected, you can now focus on draining the water from the fuel filter. If there is water present, it should be drained, and it is advisable to also drain some fuel along with it to ensure that any water residue is removed. This process helps prevent water from being reintroduced into the system.
After draining the water and some fuel, it is now important to refill the system with fresh, clean fuel. This step ensures that the fuel filter and the fuel system are primed correctly and helps maintain the overall health of the engine.
Finally, it is crucial to bleed the fuel system to remove any air that may have entered during the draining and refilling process. Refer to specific instructions for bleeding the fuel system of a VW T5 to ensure that all air is removed and the system is primed correctly.
Draining water from the fuel filter of a VW T5 is an important maintenance task that helps keep the fuel system in optimal condition. By following these steps, you can effectively remove water contamination and help ensure the smooth operation of your vehicle's engine.
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Disconnecting the return pipe from the filter
Firstly, locate the return pipe, which is marked as "RT". This pipe is connected to the filter and plays a vital role in circulating fuel back to the fuel system. Before disconnecting any pipes, it is essential to exercise caution and place a container underneath to catch any spilling fuel. This will prevent fuel from spilling onto the floor and creating a hazardous situation.
Once you have identified the RT pipe, proceed to carefully detach it from the filter. This step requires a steady hand and a basic understanding of the vehicle's fuel system. Loosen the connection between the pipe and the filter, being mindful of any fuel that may be present in the line. Have a fuel-safe container ready to collect any fuel that might spill during this process.
After successfully disconnecting the return pipe, you will have access to the filter itself. At this stage, it is common to inspect the filter for any signs of damage, debris, or water contamination. If you notice any issues with the filter, it may be necessary to replace it with a new one to ensure the fuel system operates efficiently.
Before proceeding with the next steps of priming the fuel pump, ensure that you have carefully set aside the disconnected return pipe and filter in a safe location. It is important to keep these components secure and free from any potential contaminants. Additionally, if there is a significant amount of fuel in the system, you may consider collecting it in an appropriate container for proper disposal or reuse.
By following these steps, you will have successfully disconnected the return pipe from the filter in your VW T5 vehicle. Remember to refer to the official service manual or seek advice from a qualified mechanic if you have any doubts or concerns about this procedure. Safety should always be a top priority when working on your vehicle's fuel system.
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Frequently asked questions
It is recommended that you prime your VW T5 fuel filter every 120,000 km if you live in a country with stable fuel quality, and every 40,000 km if you live in a country with unreliable fuel quality.
You will need a VW-specific scan tool to access the basic settings and run the electric fuel pumps. Alternatively, you can use a vacuum to prime the fuel filter canister, or fill it with clean fuel.
If your VW T5 is experiencing low fuel pressure, it may be time to prime the fuel filter. Check the fuel lines for any water or contaminants, and listen for any unusual engine noises.
First, disconnect the return pipe (RT) from the filter. Disconnect the fuel supply to the tandem pump and collect the fuel in a jar or glass. Use the ignition to turn on the primary fuel pump several times until fuel starts to flow. Re-connect the pipes, loosen the high-pressure outlet, and use the ignition again to ensure all air is out of the system.
Yes, it is important to work in a well-ventilated area and wear protective gear when handling fuel. Ensure that you dispose of any spilled fuel properly, and do not smoke or create any sparks near the fuel system.
