Replacing Fuel Pump In Subaru Impreza: Step-By-Step Guide

If you're experiencing a shuddering or jolting after accelerating your Subaru Impreza, it's likely that there's an issue with your fuel pump. This can be caused by worn-out internal components, which affect fuel delivery pressure and engine performance. Fortunately, changing the fuel pump on your Impreza is a simple task and can be done in under 30 minutes with the right tools and skills. Before beginning this procedure, it is important to take safety precautions as fuel is extremely flammable. Ensure you work in a well-ventilated area, keep clear of any open flames, and wear a proper respirator.

Disconnect the fuel pump relay

Disconnecting the fuel pump relay on a Subaru Impreza is a simple task, but it is important to take the necessary precautions when working with fuel. Here is a detailed, step-by-step guide on how to disconnect the fuel pump relay:

Park your Subaru Impreza in a safe and level place, preferably in a well-ventilated area, away from any open flames or sources of ignition. Open the hood and start the engine.

Locate the fuel pump relay in the power distribution box or fuse box. It is usually found at the front and to the left (driver's side) of the engine compartment. The relay should be marked, and you may need to refer to the markings on the inside or top of the distribution box lid for identification.

Once you have located the fuel pump relay, proceed to disconnect it. With the engine running, this will cause the engine to stall. Crank the engine for about three seconds to relieve any remaining pressure in the fuel system, and then turn the ignition off.

Loosen the fuel filler cap to release any built-up pressure in the fuel tank. You may also want to raise the rear seat and move the floor mat to access the fuel pump assembly and its electrical connector.

At this point, you have successfully disconnected the fuel pump relay. The next steps would involve cleaning the fuel lines and connectors and removing the jet pump hose and fuel supply and return lines. However, these steps are beyond the scope of your request, which focuses solely on disconnecting the fuel pump relay.

Remember to exercise caution when working with fuel, and always refer to a qualified mechanic or a detailed guide if you are unsure about any steps in the process.

Loosen the fuel filler cap

To loosen the fuel filler cap, simply turn it counterclockwise until it is loose enough to be removed. This will allow you to access the fuel tank and begin the process of changing the fuel pump. Make sure to have a shop rag or towel nearby to absorb any fuel that may spill during the process.

It is important to work in a well-ventilated area when dealing with fuel and to keep clear of any open flames. Fuel is extremely flammable, so it is crucial to take the necessary precautions to ensure your safety.

Once the fuel filler cap has been loosened and removed, you can proceed with the next steps of changing the fuel pump, such as raising the rear seat, moving the floor mat to the side, and removing the access lid on the floor to expose the fuel pump assembly. Remember to work carefully and follow the recommended procedures for your specific vehicle model.

Remove the access lid

To remove the access lid on your Subaru Impreza, start by parking your vehicle in a safe and level place. Open the hood and start the engine. Disconnect the fuel pump relay located in the power distribution box or fuse box at the front and to the left (driver's side) of the engine compartment. Markings on the relay, the inside or top of the distribution box lid should identify the relay.

Wait until the engine stalls and crank it for about three seconds to relieve the remaining pressure in the system, then turn the ignition off. Loosen the fuel filler cap, raise the rear seat, and move the floor mat to the side.

Now, you can remove the access lid on the floor to expose the fuel pump assembly on the fuel tank. Be sure to clean the fuel line connectors and around the fuel pump assembly lid to avoid fuel system contamination. Place a shop rag underneath the fuel lines to absorb any remaining fuel.

Disconnect the fuel pump electrical connector

Disconnecting the fuel pump electrical connector is a crucial step in changing the fuel pump on a Subaru Impreza. Here is a detailed, step-by-step guide on how to do this:

Park Your Vehicle in a Safe Place and Open the Hood

• Ensure your Subaru Impreza is parked in a safe, level area before beginning any work.
• Open the hood of your car and start the engine.

Locate and Disconnect the Fuel Pump Relay

• Locate the fuel pump relay in the power distribution box or fuse box. It is usually on the front left side (driver's side) of the engine compartment.
• Disconnect the fuel pump relay. Look for markings on the relay, inside, or on top of the distribution box lid to identify it correctly.

Wait for the Engine to Stall and Crank It

• After disconnecting the relay, wait for the engine to stall.
• Crank the engine for about three seconds to relieve any remaining pressure in the fuel system, then turn the ignition off.

Loosen the Fuel Filler Cap and Access the Fuel Pump Assembly

• Loosen the fuel filler cap and raise the rear seat to access the fuel pump assembly.
• Move the floor mat to the side and remove the access lid on the floor to expose the fuel pump assembly on the fuel tank.
• This is the critical step we are focusing on. Ensure you have a clean, dry rag or towel ready to absorb any fuel spillage.
• Disconnect the fuel pump electrical connector. This is usually located on the top of the fuel pump assembly.
• Use a suitable pair of pliers to carefully remove the spring clips or locking tabs on the hoses connected to the electrical connector.
• Gently pull the hoses to disengage the connector.
• Absorb any fuel spillage with your rag or towel and place it underneath the fuel lines to catch any remaining fuel.

Remember to work in a well-ventilated area and take precautions to avoid any open flames or sparks, as fuel is highly flammable.

Remove the jet pump hose

To remove the jet pump hose on a Subaru Impreza, you will need to follow these steps:

Firstly, locate the jet pump hose. This is found in the fuel pump assembly, which is accessed by removing the rear seat and moving the floor mat to the side. Once you have located the fuel pump assembly, you will need to disconnect the fuel pump electrical connector. Clean the area around the fuel pump assembly and the fuel lines connectors to avoid any fuel system contamination.

Now, you are ready to remove the jet pump hose. Hold the quick connector and press down on the locking tabs at the end of the connector. Then, pull the line to disengage the connector. Place a shop rag or towel underneath the fuel lines to absorb any remaining fuel.

By following these steps, you will be able to safely and effectively remove the jet pump hose on your Subaru Impreza. Remember to work in a well-ventilated area and take the necessary precautions when working with fuel.

Frequently asked questions