How to Replace and Upgrade the Fuel Pump in a Honda Civic Si for High Performance?

April 15, 2024

When it comes to tuning your Honda Civic Si, a robust fuel system is key to achieving optimum performance. One crucial element of this system is the fuel pump, a piece of equipment that serves as the heart of your Honda’s fuel delivery system. The pump pulls fuel from the tank and pushes it to the engine under the right pressure. So, whether you’re dealing with a faulty pump or aiming for a high-performance upgrade, you’re in the right place. In this comprehensive guide, we’ll walk you through the process of replacing and upgrading the fuel pump in a Honda Civic Si, with a focus on the Walbro 255 LPH (liters per hour) fuel pump kit. Let’s dive in.

Understanding the Importance of a High-Performance Fuel Pump

To embark on a DIY fuel pump replacement and upgrade, it’s crucial to understand the role and importance of a high-performance fuel pump. A fuel pump ensures that your car’s engine receives a constant and precise flow of gasoline. It’s common to find stock fuel pumps in many Honda Civic models, which work perfectly well for regular driving conditions. However, when you start adding performance upgrades, the stock pump may not provide the necessary fuel volume and pressure. In high-performance scenarios, you need a pump that can deliver up to 255 LPH at 43.5 PSI or even more.

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A high-performance fuel pump like the Walbro series provides the enhanced flow and pressure ratings required for high horsepower applications. They’re designed to withstand the harsh environments inside a fuel tank and guarantee longevity and reliability.

Selecting the Right Fuel Pump and Installation Kit

When upgrading your fuel pump, it’s crucial to choose a pump and installation kit suited to your specific vehicle model and the type of performance you’re aiming for. Walbro pumps are a popular option due to their high-flow design and robust performance. Particularly, the Walbro 255 LPH pump is a pro-choice for many Honda Civic Si owners. This pump can move large volumes of fuel, making it ideal for tuned vehicles that demand more fuel.

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An installation kit should typically include the pump itself, a filter, necessary connectors, a fuel hose, and a retention clip. A ring removal tool may also be needed to remove and secure the retaining ring on your Honda Civic’s fuel pump.

Preparing for the Fuel Pump Replacement and Upgrade

Before you begin, take a quick view of your workspace and ensure you have all the necessary tools on hand. You’ll need a socket set, a ring removal tool, a fuel line disconnect tool, and a pry bar, among others. It’s also essential to work in a well-ventilated area and keep a fire extinguisher close by, considering you’ll be working with combustible fuel.

To avoid any damage to your vehicle’s electrical system, you should disconnect the negative battery terminal. Also, it’s a good idea to let the vehicle sit for a few hours to cool down and allow the fuel pressure in the lines to decrease.

Replacement and Upgrade Procedure

Here comes the most exciting part: installing your new high-performance fuel pump. Start by removing the rear seat of your Civic, which will give you access to the fuel pump cover. Once you unscrew the cover, you’ll find the fuel pump and sending unit assembly. Carefully disconnect the electrical connectors and the fuel supply line from the top of the assembly.

Using a ring removal tool, remove the retaining ring that holds the fuel pump assembly in place. You can now lift the assembly out of the tank, taking care not to damage the float that’s attached to it. Once removed, replace the stock pump with your new Walbro fuel pump, following the instructions provided with the installation kit.

After installing the new pump, reverse your steps to reassemble the unit. Place the assembly back into the tank, secure the retaining ring, reconnect the fuel line and electrical connectors, and replace the pump cover. Lastly, reconnect the battery, start the car and check for any leaks.

By replacing and upgrading your fuel pump, you’re empowering your Honda Civic Si to handle more demanding conditions and high-performance tuning. Just remember that while an upgraded fuel pump can significantly improve your vehicle’s performance, it must be complemented by a well-maintained fuel delivery system for the best results.

Troubleshooting Common Fuel Pump Problems

The performance of your Honda Civic Si can be significantly hindered by a faulty fuel pump. Before replacing or upgrading your fuel pump, it’s wise to identify symptoms of potential fuel pump issues. A failing fuel pump may manifest in several ways such as decreased fuel efficiency, difficulty starting, power loss especially while accelerating, engine misfire, and ultimately, a non-starting engine. If you notice any of these signs, it’s time to check the fuel pump.

When checking, pay attention to the condition of the fuel filter. A clogged fuel filter can mimic the symptoms of a failing fuel pump. If the fuel filter is not the problem, you can perform a fuel pressure test to ascertain the state of the pump. This test measures the pressure in the fuel lines, indicating whether the pump is delivering fuel at the right pressure.

If the problem persists despite your troubleshooting efforts, then a replacement may be in order. When replacing, consider upgrading to a high-performance fuel pump like the Walbro 255 LPH fuel pump that provides optimal flow and pressure for high horsepower applications.

The Aftermath of the Fuel Pump Upgrade: What to Expect

After successfully replacing and upgrading your fuel pump, you should expect some significant improvements. A robust fuel pump like the Walbro 255 LPH promises not only enhanced flow and pressure ratings but also longevity and reliability. This, in essence, translates to improved fuel efficiency and overall engine performance.

With an upgraded fuel pump, your Honda Civic Si will be better equipped to handle the challenges of high-performance driving conditions. You’ll experience smoother acceleration, better throttle response, and a more satisfying driving experience overall.

However, it’s important to monitor the condition of the upgraded fuel pump regularly. Regular maintenance checks can help ensure the fuel pump, and the entire fuel delivery system operate at optimal efficiency. Also, it’s crucial to use high-quality fuel to prevent damaging your new high-performance fuel pump.


Investing in a high-quality, high-performance fuel pump is a smart move for any Honda Civic Si owner looking to optimize their vehicle’s performance. The Walbro 255 LPH is an ideal choice, thanks to its robust design, high flow rate, and pressure ratings.

The replacement and upgrade process is not overly complicated, but it does require careful attention to detail and a few specialized tools. As always, safety should be your top priority when working with fuel and electrical components.

Remember, upgrading your fuel pump is just one aspect of tuning your vehicle for better performance. For optimal results, regular maintenance of the entire fuel delivery system is essential. Following this comprehensive guide will set you on the right path to achieving a high-performance Honda Civic Si that’s ready to conquer the roads. Enjoy your drive!