Replacing Fuel Pump In Daewoo Lanos: Step-By-Step Guide

Changing the fuel pump in a Daewoo Lanos can be a challenging task. The fuel pump is located inside the fuel tank, which can be accessed by removing the rear seat and a cover. It is important to disconnect the negative battery terminal before working on the pump to avoid any safety hazards. When replacing the fuel pump, one must disconnect the fuel lines and electric plugs, and carefully remove the pump assembly. Additionally, it is recommended to check the fuel filter and other related components, such as the fuel pressure sensor and sending unit, to ensure optimal fuel delivery and engine performance.

Locating the fuel pump

It is important to note that the Lanos has an immersed pump, so you will need to look either under the rear seats or in the luggage compartment. The pump is covered by a round metal or plastic cover, which is held in place by a large plastic or metal ring. This ring may need to be unscrewed or just turned slightly to disengage the securing lugs.

Before beginning any work on the fuel pump, it is crucial to disconnect the battery negative terminal to avoid any potential safety hazards.

Additionally, when locating the fuel pump, be cautious of the plastic disconnect on the side leading from the fuel tank as it can be brittle and easily break.

Removing the rear seat and cover

To access the fuel pump in a Daewoo Lanos, you will need to remove the rear seat and cover. Here is a step-by-step guide on how to do this:

Step 1: Remove the Rear Seat

• Start by removing the bottom of the rear seat. You may need to refer to your vehicle's manual to locate the necessary bolts or screws holding the seat in place. Once you have located them, use the appropriate tool to remove them.
• Gently lift and pull the seat outwards to remove it from the vehicle. Place it safely aside, as you will need to reinstall it later.

Step 2: Locate and Remove the Cover

• With the rear seat removed, you should now see a round cover, approximately 6 inches in diameter. This is the access point for the fuel pump.
• To remove the cover, you will need to turn or unscrew it. It is likely held in place by a large plastic or metal ring. You may need to unscrew this ring or turn it slightly to disengage the securing lugs.
• Be cautious during this process, as there may be fuel lines or electrical connections attached to the cover.

Once you have removed the rear seat and cover, you should now have access to the fuel pump. Proceed with caution and refer to a qualified mechanic or a repair manual for further instructions on replacing the fuel pump. Remember to always disconnect the battery negative terminal before working on any fuel-related components.

Disconnecting the fuel lines and electric plugs

Firstly, locate the fuel pump. In the Lanos, the pump is located inside the fuel tank, which can be accessed by removing the rear seat. You will then see a round cover, which you should open to expose the fuel pump.

Now, to disconnect the fuel lines and electric plugs:

• Identify the two fuel lines and electric plugs that are connected to the fuel pump.
• Carefully release the clamps or couplings that secure the fuel lines to the pump. You may need a fuel line disconnect tool for this step, as the plastic disconnects can be brittle and delicate.
• Once the clamps are released, gently pull the fuel lines away from the pump.
• For the electric plugs, locate the locking mechanism and turn it to unlock the connection.
• After unlocking, carefully pull the electric plugs away from the fuel pump.

At this point, the fuel lines and electric plugs should be successfully disconnected from the fuel pump. It is important to be cautious throughout this process to avoid any damage to the surrounding components and to minimise the risk of fuel leakage. Ensure you have rags or absorbent materials nearby to catch any spilled fuel.

Now that the connections have been released, the fuel pump assembly can be removed for replacement.

Using a fuel line disconnect tool

Firstly, it is recommended to get a fuel line disconnect tool, which can be purchased at most auto parts stores. This tool is designed to help you safely separate the fuel lines from the fuel filter. Without this tool, you risk damaging the fuel lines and causing fuel leaks.

Once you have the tool, locate the fuel filter. In the Daewoo Lanos, it is usually found either under the rear seats or in the luggage compartment. You will need to remove the rear seat and any covering to access the fuel pump and fuel filter.

Now, carefully position the fuel line disconnect tool around the tube of the fuel filter. Ensure that the tool is clamped securely in place before proceeding.

Next, push the tool up into the fitting on the fuel line. This action will retract the retaining fingers in the fuel line fitting, which are spring-loaded radially. These retaining fingers normally grip a flange on the filter tubing tightly, so using the tool to retract them is essential for safely removing the fuel filter.

In some cases, you may encounter difficulty using the disconnect tool due to space constraints. If this happens, an alternative approach is to use a plastic sleeve or retainer, which can also be purchased at auto parts stores. Cut the fuel tubing at the body of the filter with a hacksaw, being extremely cautious not to damage any surrounding components. With the tubing cut, you can then use the disconnect tool or plastic sleeve to retract the retaining fingers and detach the fuel line from the fuel filter.

Remember to exercise extreme caution throughout the process, as the fuel lines contain flammable fuel, and any leaks can be dangerous. It is always a good idea to have a helper ready to block the fuel lines to prevent leaks.

Checking the injectors

To check the injectors, you will need a noid light, which you can purchase at any major chain auto store.

First, locate the injectors. They will be connected to the fuel rail, which is attached to the engine. The fuel rail is a metal tube that carries fuel to the injectors. Once you have located the injectors, you will need to disconnect the electrical connector from each injector. This can be done by pressing the tab on the connector and pulling it away from the injector.

Next, connect the noid light to each injector, one at a time. Have an assistant turn the key in the ignition to the "on" position, but do not start the engine. If the noid light flashes, that means the injector is receiving power and is functioning properly. If the noid light does not flash, that means the injector is not receiving power and may be faulty.

In addition to checking the injectors with a noid light, you can also perform a visual inspection of the injectors for any signs of damage or corrosion. If the injectors appear to be damaged or corroded, they will need to be replaced.

It is important to note that working with fuel injectors can be dangerous, as they are part of the fuel system and are under pressure. It is recommended that you wear safety goggles and gloves when working with fuel injectors to protect yourself from any potential hazards.

Frequently asked questions