Replacing Fuel Accumulator: Step-By-Step Guide For Beginners

Replacing a fuel accumulator can be a complex task, but with the right tools and safety measures, it can be done seamlessly. The fuel accumulator is part of the fuel system and is crucial in preventing vapour lock by keeping the system pressurised. Here are the steps to replace a fuel accumulator:

- Park your vehicle on a firm, level surface and engage the parking brake.

- Locate the fuel accumulator. It is usually found in the fuel tank or next to the fuel pump.

- Depressurise the fuel system.

- Disconnect the fuel lines from the accumulator.

- Remove the old accumulator.

- Install the new accumulator, ensuring it is securely fastened.

- Reconnect the fuel lines.

- Refill the fuel tank and test for leaks.

Depressurise the fuel system

Depressurising a fuel system is an important step before making any adjustments to avoid spraying yourself with hot, highly pressurised fuel. Here is a step-by-step guide on how to depressurise a fuel system:

Park your vehicle and put on the parking brake:

This is to ensure that the vehicle doesn't move during the process.

Locate the fuel pump and test it:

On most vehicles, the fuel pump is located in the fuel tank. Open the fuel cap and ask an assistant to turn the key to the "ON" position while you listen at the filler opening. A properly functioning fuel pump will make a humming sound for two to three seconds. If there is no sound, the pump may need to be replaced.

Check the fuel pump fuse and relay:

If the fuse is blown, replace it with one of the same amperage. If the fuse and relay are functional, proceed to the next step.

Check for power and ground at the fuel pump:

If there is power and ground at the pump, then the pump is faulty and needs to be replaced.

Relieve the fuel system pressure and disconnect the battery:

Disconnect the negative battery cable. Siphon or drain as much fuel as possible from the fuel tank. Detach the filler tube hose and the electrical connection to the pump.

Support the fuel tank and remove it:

Use a jack and a block of wood to support the fuel tank. Remove any retaining straps or bolts holding the tank to the frame, then carefully lower it.

Depressurise the fuel system:

Loosen the fuel filter cap without removing it to release any remaining pressure. Use a flare wrench to loosen the fuel line fittings without detaching them. Wait for any hissing to stop and clean up any spilled fuel.

Optional: Completely detach the fuel lines if replacing the fuel filter:

If you are replacing the fuel filter, disconnect the sensor wire plugs and open the valve drain to release any remaining fuel into a pan.

Re-pressurise the fuel system (after making necessary repairs):

Tighten the fuel lines and screw the fuel filter cap back into place. Reconnect the negative battery cable. Fill the tank with fuel and conduct a road test to ensure a successful repair.

Disconnect the fuel lines

Disconnecting the fuel lines is a crucial step in replacing the fuel accumulator. Here is a detailed guide on how to do it:

Before you begin, ensure the car has been sitting for a while, preferably overnight. This allows the fuel system to depressurise, which is essential for safety. Working on a pressurised fuel system can be extremely dangerous.

First, locate the fuel lines. These are the lines that connect the fuel accumulator to the rest of the fuel system. They are usually found near the fuel pump and tank. Once located, the next step is to carefully disconnect them. This can be done in several ways, depending on the type of connectors used. Some common methods include:

• Using a quick-disconnect tool specifically designed for fuel lines.
• Clamping the fuel line with a specialised fluid line clamp to stop fuel flow before disconnecting.
• For spring-type connectors, a small piece of zip tie can be curled and inserted into the connector to depress the spring, allowing the line to be removed.
• Cutting off the end of a screw clamp to create an open-ended ring, which can then be slipped over the fuel line and pushed into the connector to release it.

When disconnecting the fuel lines, be prepared for some fuel spillage. It is recommended to have paper towels or a container ready to catch any fuel that may leak out. It is also important to work in a well-ventilated area due to the risk of inhaling gasoline fumes.

Additionally, it is crucial to wear the appropriate safety gear, such as gloves and safety glasses, to protect your skin and eyes from gasoline exposure. Gasoline is a hazardous chemical, and skin contact should be avoided.

Once the fuel lines are disconnected, carefully lower the fuel accumulator and remove it from the vehicle. This may require removing any retaining straps or bolts holding it in place. Be cautious not to damage any surrounding components or fuel lines during this process.

After the old fuel accumulator is removed, you can proceed to install the new one. Simply secure the new accumulator in place, reconnect the fuel lines, and ensure all connections are tight to prevent leaks.

Finally, conduct a road test to ensure the new fuel accumulator is functioning correctly and that there are no fuel leaks.

Remove the old fuel accumulator

To remove the old fuel accumulator, you will need to first depressurise the fuel system. This can be done by undoing the union at the fuel filter, which is usually located under the driver's side front fender or sill. Some fuel will escape during this process, so have a container or rag ready to catch it.

Next, you will need to locate the accumulator. It is usually found next to the fuel pump. Once located, use a fluid line clamp to block the fuel line and then simply unscrew the old accumulator. It is attached by a jubilee clamp at the rear and branches into the fuel pump output.

When removing the old accumulator, be prepared for some fuel spillage. It is recommended to wear long sleeves with the cuffs buttoned or to tie a shop towel around your wrists, as fuel can run down your arm. Additionally, keep a fire extinguisher nearby as a safety precaution.

Install the new fuel accumulator

To install the new fuel accumulator, follow these steps:

• Ensure that the new fuel accumulator is the correct part by comparing it with the old one.
• Install the new fuel accumulator in the original position, ensuring proper alignment and securely tightening any bolts or nuts.
• Reconnect the fuel lines to the new accumulator, using the correct connections and seals, and don't forget to use hose clamps where needed.
• Refill the fuel tank and conduct a road test to confirm a successful repair.
• Before starting the engine, make sure that all the fuel you may have spilled has evaporated and that your fuel lines are tight.
• Turn the key towards the ignition position without starting the engine.
• When you are confident that the fuel system is pumping fuel through the new accumulator without leaking, start the engine.

Reconnect the fuel lines

To reconnect the fuel lines, follow these steps:

• Clean the connectors on the fuel tank and the engine with a clean rag. This will remove any dirt or debris that may interfere with the connection.
• Apply a small amount of fuel line lubricant to the connectors to prevent leaks.
• Carefully insert the fuel line into the connectors, ensuring the line is fully seated.
• Use pliers to tighten the connectors. Be careful not to overtighten, as this could damage the fittings.
• Reconnect the battery's negative terminal.
• Start the engine and allow it to run for a few minutes. Check for any fuel leaks around the connectors. If you notice any leaks, tighten the connectors further.

If you need to replace the fuel line, follow these additional steps:

• Disconnect the fuel line as described above.
• Measure the length of the old fuel line and cut a new fuel line to the same length.
• Connect the new fuel line to the fittings on the fuel tank and the engine.
• Tighten the connectors using pliers.
• Start the engine and check for leaks.

Frequently asked questions