Changing a fuel tank is a big job, but it's a simple process that doesn't usually require any specialist tools. However, it's important to be aware of the dangers involved when dealing with fuel, which has a propensity to ignite. Before you begin, make sure you have the necessary tools and equipment, such as car jacks, spanners, wrenches, and a fire extinguisher. You'll also need to drain the tank completely, which can be done by removing the drain plug or one of the fuel lines. With the tank empty, you can then remove the fuel lines and disconnect the electrical connections before carefully lowering the tank and installing the new one.
Characteristics | Values |
---|---|
Fuel tank location | Under the rear or middle of the vehicle |
Reasons for removal | Replace fuel pump, leakage, contamination, sensor or part failure |
Fuel tank duties | Store fuel and fuel vapour |
Fuel tank materials | Plastic or metal |
Fuel tank replacement reasons | Leak, puncture, damage |
Preparation tools | Car jacks, spanner set, wrench set, hose clamps, fuel can, fire extinguisher |
First step | Drain the fuel tank |
Fuel line details | Smaller line at the bottom, larger line at the top, third air-line |
Rear suspension | May need to be dropped and supported with a jack |
Fuel tank straps | Two metal straps held in place by two bolts |
What You'll Learn
Drain the fuel tank
Before installing a new fuel tank, it is important to drain the fuel from the old tank. This is a necessary step to ensure safety and prevent accidents. Here are the steps you can follow to drain your fuel tank:
Prepare the Necessary Tools and Safety Measures:
- Ensure you are working in a well-ventilated area to avoid inhaling fuel fumes, which can be dangerous.
- Keep a fire extinguisher nearby as fuel is highly combustible and flammable.
- Have a proper gas storage container ready to catch the draining fuel. Use a wide-mouthed container, such as a basin, to collect the fuel.
Locate the Drain Plug or Fuel Lines:
- Some fuel tanks have a drain plug or cock located near the bottom of the tank. If your tank has a drain plug, use a wrench to loosen it, and the fuel will start to drain out.
- If there is no drain plug, look for the fuel lines. Identify the rubber hose exiting the tank at its lowest point, which will be connected to either an electric fuel pump, fuel filter, or a hard fuel line leading to the front of the car.
Drain the Fuel:
- If you have a drain plug, simply loosen it with a wrench, and the fuel will start draining out.
- If you are draining through the fuel line, loosen the clamp on the end of the line connected to the fuel tank using a ratchet and the appropriate socket. Pull the hose off and allow the fuel to flow into your container until the tank is completely drained.
- Alternatively, you can use a hose and insert it into the tank. Suck on the other end of the hose to start the fuel flow and then transfer the fuel to a container. However, this method carries a risk of inhaling toxic fumes or getting fuel in your mouth, so proceed with caution.
- Another option is to use a manual pump, fuel tank adapter, and a fuel line. Connect the fuel line to the tank adapter and the adapter to the pump. Start the pump, and the fuel will be forced out into the container.
Store the Drained Fuel Safely:
Once you have completely drained the fuel tank, pour the fuel into a gas can and store it safely. You can even use this fuel for your new tank.
Remember to work carefully and patiently throughout the process, keeping safety as your top priority.
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Disconnect the fuel lines
Disconnecting the fuel lines is a crucial step in changing a fuel tank. It requires careful attention to detail and a methodical approach to ensure safety and avoid any potential hazards. Here is a step-by-step guide to disconnecting the fuel lines:
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The first step is to identify all the lines connected to the fuel tank. Typically, there are multiple lines attached, each serving a specific purpose. These include the fuel supply line, which carries fuel from the tank to the engine or fuel pump, and the large fill tube, which is connected to the gas fill entry point, also known as the fuel filler tube. Additionally, there is a vent line that helps release pressure when the tank's fuel level changes.
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Before disconnecting any lines, it is essential to have a clear understanding of the setup. Taking a digital photograph of the arrangement can be incredibly helpful for reference during the reassembly process. This visual record ensures that you can correctly reconnect the lines and prevent confusion. It is also important to ensure that you are wearing appropriate safety gear, including protective gloves and eye protection, before proceeding.
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Now, you can begin the process of disconnecting the fuel lines. Some lines can be easily detached by pressing on each side of the connection with your fingers and gently pulling the line away from the tank. It is important to do this slowly and carefully to avoid any sudden movements that could lead to spills or damage. Work on one line at a time to prevent mixing them up. Place the disconnected lines in a safe area away from the workspace.
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Some fuel lines may have a spring clip or clamp that needs to be released using a specialised tool, such as a spring release tool or a wrench. Make sure you have the correct tool for the type of clip or clamp present in your vehicle's fuel lines. Gently insert the tool and release the mechanism holding the line in place. Once the clip or clamp is released, carefully pull the line away from the tank, being mindful of any residual fuel that may be present in the line.
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As you disconnect each line, it is crucial to properly contain any residual fuel that may drip from the lines or the tank. Have a fuel-resistant container or receptacle ready to catch any drips or spills. This step is vital to prevent fuel from coming into contact with hot engine components, which could pose a fire hazard. It also ensures that you can safely dispose of or store any excess fuel that may be released during the disconnection process.
By following these steps, you can safely and effectively disconnect the fuel lines when changing a fuel tank. Remember to work slowly, refer to your photographs, and prioritise safety at all times.
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Remove the fuel tank straps
Removing the fuel tank straps is a critical step in changing a fuel tank. Here is a detailed guide on how to do it:
First, locate the fuel tank straps. There are typically two straps that hold the fuel tank in place securely. These straps are usually made of metal and are designed to keep the tank tightly and safely in position.
Next, gather the necessary tools. You will need a ratchet and the appropriate socket size, usually 15mm. A 15mm crowfoot or OE wrench can also be used to hold the bolt head. In some cases, you may need a drill with a hole cutter or a vise grip to deal with rusted bolts.
Now, begin the process of removing the straps. Using your ratchet, loosen the strap mounting bolts. You may encounter rust or spinning bolts that don't back outward. If the bolts are spinning freely, try to access the nuts that may be welded inside the frame. You might need to wedge a screwdriver or use an open-end wrench to reach the internal nut. If the bolts are rusted, consider using a penetrant to soak the nuts beforehand.
If you are unable to remove the bolts due to severe rust or breakage, you may need to cut the strap. This can be done by using a grinder or a hacksaw to cut the strap near the bolt, allowing the fuel tank strap to fall off.
Finally, with the bolts loosened or the straps cut, carefully remove the straps. Ensure that the fuel tank is supported by a jack or a stand to prevent it from falling unexpectedly.
Remember, working on a fuel tank can be dangerous due to the presence of flammable fuel. Always work in a well-ventilated area, keep a fire extinguisher nearby, and drain the fuel tank completely before starting any work.
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Disconnect electrical connections
Disconnecting the electrical connections from a fuel tank is a delicate task that requires careful attention to safety and procedure. Here is a detailed guide on how to safely disconnect the electrical connections when changing a fuel tank:
Prepare the Work Area:
Before beginning any work on the fuel tank, ensure your work area is clean, organised, and well-ventilated. Clutter can cause accidents, and proper ventilation is crucial when working with flammable gases. It is also recommended to keep a fire extinguisher nearby as fuel is highly combustible.
Disconnect the Battery:
Disconnect the battery's negative terminal to prevent electrical sparks, which could ignite fuel vapours. This is a crucial safety step.
Locate the Electrical Connectors:
Identify the electrical connectors attached to the fuel tank. These connectors may vary depending on the vehicle's model and year. Consult a repair manual or seek advice from a qualified mechanic if you are unsure.
Disconnect the Electrical Connectors:
To disconnect the electrical connectors, follow these steps:
- Clean the connectors and their surroundings to ensure no dirt or debris interferes with the disconnection process.
- Identify the type of connector. They may be plastic or metal and could have a grey connector lock or a tab that needs to be lifted.
- For plastic connectors, press the connector release clips and pull them away from the tank.
- For metal connectors, refer to the vehicle's repair manual or seek advice from a qualified mechanic. Metal connectors may have specific instructions that need to be followed for safe disconnection.
Relieve Fuel Pressure:
Before proceeding further, it is important to relieve fuel pressure in the system. Start the engine and remove the fuel pump relay in the under-hood fuse block. The engine will stall, and you can then try to start it again to relieve most of the pressure.
Lower the Fuel Tank Gradually:
Slowly lower the fuel tank to access the lines and electrical connectors at the top. Lowering it too quickly or too much can break fuel lines or pull wiring from the connectors, causing damage or sparking a hazard.
Disconnect with Care:
When disconnecting the electrical connectors, be gentle and deliberate. Pulling too forcefully could damage the connectors or the wiring. Use rags to absorb any fuel spills, and always be mindful of potential ignition sources.
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Work in a well-ventilated area
Changing a fuel tank is a big job, and it is important to take the necessary precautions to ensure your safety. One crucial precaution is to always work in a well-ventilated area. This is because, even when the fuel tank is completely drained, it will still emit fuel vapors, which can be dangerous.
Fuel vapors can cause you to pass out, leading to potential injury. Additionally, in the case of petrol, the vapors are highly flammable, and a single spark could lead to a fire or explosion. Therefore, it is essential to work in a space with adequate ventilation to avoid the buildup of fuel vapors.
When working on your fuel tank, avoid enclosed spaces, such as a garage with the door closed. Instead, choose an open, airy workspace to ensure proper ventilation. It is also recommended to have a fire extinguisher nearby as an extra safety precaution.
By working in a well-ventilated area, you can help reduce the risk of accidents and create a safer environment for yourself and those around you. Remember, changing a fuel tank can be a complex and potentially dangerous task, so always prioritize your safety and take the necessary time to prepare your workspace adequately.
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Frequently asked questions
The first sign that your fuel tank is damaged is usually finding puddles of fuel under your car after it has been parked. You may also notice higher fuel consumption than normal.
Ensure you have the right tools and equipment. You will need various fasteners, clamps, and connectors to remove the tank. It is also important to work in a well-ventilated area with no sources of flame or spark present. Have a fire extinguisher to hand and make sure you have a container to catch the draining fuel.
The first step is to drain the fuel from your tank. Many tanks have a small stop valve that will allow you to drain the fuel. If not, you will need to remove one of the fuel lines.
The next step is to disconnect the fuel lines and remove the fuel tank straps. You may also need to drop the rear suspension if you can't access the tank.
Once the old tank is removed, you can install the new tank. Simply reverse the removal process to reconnect the fuel lines and refasten the tank. Fill the car with fuel and inspect the tank for any leaks.