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The Nissan S13 240SX is a beloved platform among car enthusiasts, particularly those interested in tuning and performance upgrades. One of the key areas to focus on when increasing horsepower is the fuel system. In this guide, we will cover the steps necessary to upgrade your S13 240SX’s fuel system to support a power increase from 150 to 220 horsepower.
Understanding Your Current Fuel System
Before diving into upgrades, it’s essential to understand the existing fuel system in your S13 240SX. The stock fuel system is designed to support a certain level of horsepower, typically around 150 hp. To achieve higher performance, you need to enhance various components of the system.
- Fuel Pump
- Fuel Injectors
- Fuel Pressure Regulator
- Fuel Lines
- Fuel Filter
Step 1: Upgrading the Fuel Pump
The fuel pump is crucial for delivering the right amount of fuel to the engine. For a power level of 220 hp, you will need a high-flow fuel pump. A popular choice is the Walbro 255lph fuel pump.
Installation Steps
Follow these steps to install the new fuel pump:
- Disconnect the battery.
- Remove the fuel pump access panel.
- Disconnect the fuel lines and electrical connectors.
- Remove the old pump and replace it with the new one.
- Reassemble the access panel and reconnect the battery.
Step 2: Upgrading Fuel Injectors
After upgrading the fuel pump, the next step is to replace the stock fuel injectors. Higher horsepower requires larger injectors capable of delivering more fuel.
Choosing the Right Injectors
For a target of 220 hp, 550cc injectors are generally recommended. Brands like DeatschWerks and Injector Dynamics offer reliable options.
Installation Steps
To install the new fuel injectors, follow these steps:
- Remove the intake manifold to access the injectors.
- Disconnect the electrical connectors from the old injectors.
- Remove the old injectors and install the new ones.
- Reconnect the electrical connectors and reassemble the intake manifold.
Step 3: Upgrading the Fuel Pressure Regulator
The fuel pressure regulator ensures that the fuel system maintains the correct pressure. Upgrading to an adjustable fuel pressure regulator allows for fine-tuning the fuel pressure to match your new setup.
Installation Steps
Here’s how to install the new fuel pressure regulator:
- Locate the stock fuel pressure regulator.
- Disconnect the vacuum line and fuel line.
- Remove the old regulator and install the new adjustable one.
- Reconnect the fuel line and vacuum line.
Step 4: Upgrading Fuel Lines
Stock fuel lines may not be sufficient for higher horsepower applications. Upgrading to larger diameter fuel lines can help ensure proper fuel delivery.
Choosing the Right Lines
Consider using 6AN or 8AN fuel lines for optimal flow. Stainless steel braided lines are a durable option.
Installation Steps
To install the new fuel lines, follow these steps:
- Remove the old fuel lines from the fuel tank to the engine.
- Install the new larger diameter fuel lines.
- Ensure all connections are secure and leak-free.
Step 5: Replacing the Fuel Filter
A new fuel filter is essential to prevent contaminants from entering your upgraded fuel system. Make sure to replace it after all other upgrades are completed.
Installation Steps
Follow these steps to replace the fuel filter:
- Locate the fuel filter, typically found along the fuel line.
- Disconnect the fuel lines from the filter.
- Remove the old filter and install the new one.
- Reconnect the fuel lines securely.
Final Steps and Testing
After completing all upgrades, it’s crucial to test the fuel system to ensure everything is functioning correctly. Start the engine and check for any leaks in the fuel lines and connections.
Once you confirm there are no leaks, take your S13 240SX for a test drive. Monitor the engine’s performance and ensure it runs smoothly at the new power level.
Conclusion
Upgrading the fuel system in your S13 240SX is a vital step in achieving your horsepower goals. By following these steps, you can ensure that your vehicle is ready to handle the increased power and performance. Always remember to tune your engine accordingly to maximize the benefits of your upgrades.