Sylvie Willis
Draining the fuel tank of a WRX car can be done in several ways. One method is to disconnect the fuel line from the engine, which goes from the fuel filter to the hardline on the intake manifold, and catch the squirting fuel in a fuel jug. Another method is to use a siphon, which can be started with the mouth or by using a Mighty Vac. Additionally, one can drop the muffler and tail pipe to access the filler tube connection and drain the tank with a hand pump.
| Characteristics | Values |
|---|---|
| Why drain the tank | Old fuel, to check O-Ring, to break in a new motor |
| Methods | Disconnecting the hose, removing the fuel pump and siphoning, removing the fuel line, removing the gas cap, using a hand pump |
| Amount drained | 2-3 tablespoons, 2 gallons, 3 gallons, 4 gallons, 6 gallons |
| Issues | Not being able to get all the gas out, fuel gauge reading incorrectly, fuel syphoning |
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What You'll Learn
Siphoning the fuel
To siphon the fuel, you can start by removing the fuel pump and siphoning the fuel through the opening. You can also try to disconnect the fuel return line, run some hose into a can, and put the fuel pump in test mode. Another option is to take off the fuel line from the engine, from the fuel filter to the hardline on the intake manifold, and catch the squirting fuel in a fuel jug.
If your WRX has old fuel, you may need to siphon with your mouth to get it started, but be warned, it's not pleasant!
One user suggested that you can bridge the fuel pump and use it to pump the fuel out, and then siphon the rest. Using the fuel pump is a quicker option if your tank is more than half full.
Another user shared that they drained their tank by two gallons at a time through the connector with a clamp on the hose, not the quick disconnects. They used a Mighty Vac to start the flow, and it took about 15 minutes to siphon two gallons into an approved container.
It's important to note that the WRX fuel tank is actually two tanks cross-fed by the jet pump, so you will only be able to drain the passenger side without the system being "closed".
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Using a hose
Draining the fuel tank of a WRX can be done in several ways, one of which is using a hose. Here is a step-by-step guide on how to do it:
First, locate the fuel line that runs from the fuel filter to the hardline on the intake manifold. This is usually found on the driver's side of the vehicle. Place a fuel jug or container below the fuel line to catch the fuel.
Next, remove the fuel line by disconnecting the hose. Ensure you have rags or towels nearby to wipe up any spilled fuel. Once the hose is disconnected, you can start draining the fuel into the container.
If you are having trouble getting the fuel to flow out, you can try using a Mighty Vac to start the flow, as mentioned by a WRX owner. This method can take some time, so be patient and let gravity do its work. It is important to note that this process might not drain the entire tank, as the WRX fuel tank is divided into two sections.
To completely drain the tank, you may need to use a hose to access the other side. Be cautious when handling fuel, and ensure you are in a well-ventilated area to avoid inhaling fumes.
Additionally, some WRX owners have suggested using a small, low-pressure fuel pump to make the process more efficient and less messy. This method involves purchasing a cheap fuel pump, fuel hose, and a filter. Connect the hose to the pump and filter, and then insert the hose into the filler tube. Turn on the pump, and it will draw the fuel out of the tank.
Remember always to dispose of the drained fuel properly and follow local regulations for fuel disposal.
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Disconnecting the fuel return line
Locate the Fuel Return Line: The fuel return line is one of the lines coming off the fuel rail. It may be challenging to identify the correct line, as there are mixed results even among experts. One way to identify it is by its location, which is usually on the driver's side of the intake manifold. It is also typically the line with a “normal” hose clamp, not the fuel line fitting.
Prepare the Necessary Tools and Safety Precautions: Before beginning any work on your vehicle, it is essential to have the necessary tools and safety equipment. For this task, you will need a fuel jug or an approved container to catch the fuel, rags to wipe up any spills, and safety gear such as gloves and eye protection. It is also recommended to work in a well-ventilated area to avoid inhaling fuel vapors.
Disconnect the Fuel Return Line: Once you have identified the fuel return line, you can proceed to disconnect it. Be cautious, as fuel may start to spill or spray out. Have your fuel jug or container ready to catch the fuel and avoid spills. You may also need to remove the rear seat for better access, as suggested by some WRX owners.
Use a Hose for Drainage (Optional): Some people choose to attach a hose to the disconnected fuel return line to guide the fuel into the container more efficiently. This can help minimize spills and make the process neater. Ensure the hose is suitable for fuel and securely attached to avoid leaks.
Turn on the Fuel Pump (Optional): To expedite the drainage process, you can turn on the fuel pump by turning the ignition key to the "ON" position. This will prime the pump and help draw out the fuel more quickly. Be cautious, as this may result in fuel spraying out with increased force.
It is important to note that working with fuel can be dangerous, and it is always recommended to refer to your vehicle's manual or seek professional assistance if you are unsure about any steps. Additionally, proper disposal of the drained fuel is crucial to ensure it does not pose a risk to the environment or others.
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Draining via the filler tube
To drain your WRX fuel tank via the filler tube, you'll need a few tools and materials, including a fuel pump, a siphon pump or hose, a funnel, and some fuel-resistant gloves and eye protection. Here's a step-by-step guide:
Before beginning, ensure you are in a well-ventilated area or outdoors, and don
Wear fuel-resistant gloves and eye protection for safety. Locate the fuel filler tube, which is where you normally fill your gas tank. Open the gas cap to access the filler tube. If your WRX has a locking gas cap, you'll need the key to unlock it. Insert the siphon pump or hose into the filler tube. If you're using a hose, place one end of the hose into the filler tube and secure it with a clamp or tie to ensure it doesn't fall out. Place the other end of the hose into a suitable fuel container. If you're using a siphon pump, attach it to the hose and prepare it according to the manufacturer's instructions.
Begin siphoning or pumping the fuel out of the tank and into your fuel container. Work slowly and carefully to avoid spilling any fuel. If you're using a hose, you may need to suck on the end to start the siphoning process, but be sure to have a container ready to spit into if you need to. Continue pumping or siphoning until the fuel tank is empty or you've drained the desired amount. If you're only partially draining the tank, be sure to leave some fuel in it to prevent airlocks and fuel system issues. Once you've finished draining the tank, remove the hose or siphon pump and securely close the fuel filler cap. Properly dispose of the drained fuel according to local regulations and guidelines.
Draining your WRX's fuel tank via the filler tube is a relatively straightforward process, but it's important to take the necessary safety precautions and work carefully to avoid spills. Always dispose of the drained fuel responsibly, and if you're unsure about any part of the process, consult a qualified mechanic or seek advice from a knowledgeable source.
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Using a transfer pump
Draining your WRX fuel tank using a transfer pump is a straightforward process, but it requires careful handling of fuel and attention to safety. Here's a step-by-step guide:
Prepare the Workspace and Gather Tools
Before you begin, ensure you have a safe and well-ventilated workspace. Have an "approved container" ready to collect the drained fuel. You will need a transfer pump, fuel hose, rags, and, optionally, compressed air.
Access the Fuel System
Locate the fuel pump and its connector. Depending on your WRX model, this may be in the engine bay or the rear seat area. Disconnect the fuel line at the fuel filter or the fuel pump. Some models may have a fuel sample port that can be opened for draining.
Use the Transfer Pump
With the fuel line disconnected, attach the transfer pump according to its instructions. Ensure the pump is compatible with fuel and rated for low pressure (~3-4 psi). Connect the pump to the power source and turn it on to start draining fuel.
Manage the Drained Fuel
Ensure the drained fuel is collected in your approved container. Depending on your pump and hose setup, you may need to manually manage the hose to ensure efficient fuel transfer. Be cautious, as the process can be messy.
Finalize the Process
Once you have drained the desired amount of fuel, safely disconnect and store the transfer pump. Reattach the fuel line or close the fuel sample port securely. Ensure all fuel caps are tightened, and clean up your workspace, properly disposing of any fuel-soaked rags or spillages.
Remember to exercise caution when working with fuel, and always prioritize safety and proper ventilation.
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Frequently asked questions
There are several ways to drain your WRX fuel tank. One way is to disconnect the fuel return line, run some hose into a can, and put the fuel pump in test mode. Another way is to take off the fuel line from the engine and catch the squirting fuel in a fuel jug.
If your tank is half-full, a quicker method is to bridge the fuel pump and use it to pump the fuel out. Then, siphon the rest.
You will know your WRX fuel tank is fully drained when no more fuel comes out of the fuel line.
Remove the rear seat and access the fuel tank via the covers. You can also pull the fuel pump out and siphon the fuel through there.
The old-fashioned way of draining a fuel tank is to jam a hose down the filler tube.
