Installing A Sard Fuel Pressure Regulator: A Step-By-Step Guide

Installing a fuel pressure regulator (FPR) can be a simple process, but it's important to take the necessary precautions when working with fuel. Before beginning, depressurize the fuel lines and refer to your FPR manual to identify the fuel in/out ports. The Sard FPR is designed to maintain steady fuel pressure and comes with a mounting bracket for easy installation in the engine bay. When installing, ensure you have the correct fittings and consider adding thread sealant to the fittings and letting the car sit overnight for the sealant to cure.

Removing the old fuel pressure regulator

Firstly, make sure you are working with a cool engine to avoid any hot surfaces or fuel spillages. Then, depressurize the fuel lines. You can do this by removing the fuel pressure from your fuel lines. There are a few ways to do this, but one method is to simply unplug the fuel cap and pull the fuel pump fuse, then crank the engine.

Next, locate the old fuel pressure regulator. In most cars, it will be located near the fuel rail. Once you have found it, you will need to remove the screws holding it in place. Be very careful when removing these screws, as they can be easily stripped. If this happens, you may need to spend time drilling out the screw. So, use the properly-sized screwdriver or ratchet to avoid any damage.

After the screws are removed, you can loosen the clamps on the fuel hose. In some cases, you may only need to loosen the hose clamps, while in others, you may need to completely remove the hose. Once the hose is loosened or removed, carefully pull out the old fuel pressure regulator. It is normal for a small amount of fuel to spill out, but if a significant amount is leaking, something has gone wrong.

At this point, you will be able to see the rubber O-ring. This should be replaced with a new one when you install the new fuel pressure regulator. Now, you are ready to remove the old fuel pressure regulator from the fuel return line. This step can get a little messy, as fuel may spill out. Be prepared with rags or a container to catch any spills.

Finally, once the old fuel pressure regulator is removed, you can start test-fitting the new one. Ensure that all surfaces are clean and dry before proceeding with the installation.

Installing the SARD fuel pressure regulator

Step 1: Understand the Purpose

Before installing the SARD fuel pressure regulator, it is important to understand its function. The regulator works in conjunction with the fuel pump to maintain a steady pressure relationship between the fuel line and the injectors, allowing for adjustments to suit larger aftermarket injectors and accommodating increased fuel volumes from high-flow aftermarket fuel pumps.

Step 2: Prepare the Vehicle

Start by consulting the SARD fuel pressure regulator manual to identify the location of the fuel in/fuel out ports, as these may vary depending on your specific vehicle. Ensure you have the necessary tools and components, including the regulator itself, a fuel rail adapter, fuel injection hose, fuel fittings, and fuel clamps.

Step 3: Work with Fuel Precautions

Safety is paramount when working with fuel. Do not attempt to install the regulator immediately after driving your car, as the fuel system may still be pressurized. Follow the instructions on your sealant package and allow adequate curing time if using liquid sealant. Remember to remove the fuel pressure from your fuel lines before proceeding.

Step 4: Remove the Old Fuel Pressure Regulator

Refer to your vehicle's repair manual for specific instructions on depressurizing the fuel lines. Typically, this involves cranking the car, removing the fuel pump fuse, and waiting for the car to stall and turn off. Once the lines are depressurized, remove the old fuel pressure regulator. Be careful when removing screws to avoid stripping them, as this can cause complications.

Step 5: Install the New SARD Fuel Pressure Regulator

Test-fit the new SARD fuel pressure regulator to ensure a proper fit. You may need to fabricate a bracket to secure the regulator, as demonstrated in the example of the Skyline installation, where a metal brace was utilized. Secure the regulator according to your vehicle's specifications, ensuring all fittings are secure and any necessary adapters are in place.

Step 6: Finalize Fuel Lines and Adjust Pressure

Complete the fuel line plumbing, referring to the SARD fuel pressure regulator manual to identify the fuel inlet and outlet ports correctly. Connect the vacuum hose from the manifold to the regulator, but leave it disconnected temporarily for testing purposes. Start the car and check for any leaks. If no leaks are detected, adjust the fuel pressure to the desired level as per the manufacturer's recommendations.

Step 7: Test Drive

After ensuring that the SARD fuel pressure regulator is installed correctly, with no leaks and the desired fuel pressure achieved, take the vehicle for a test drive to evaluate its performance.

The installation process may vary slightly depending on your vehicle's specific configuration, but by following these steps and consulting the SARD fuel pressure regulator manual, you can ensure a smooth and successful installation process.

Adjusting the fuel pressure

The base fuel pressure for a Nissan RB25 with the vacuum hose disconnected should be around 43 psi or 3 Bar. When you reconnect the vac hose, the pressure will drop to around 34-37 psi.

To adjust the fuel pressure, first, loosen the lock nut. Then, use a hex key to raise or lower the pressure. You can observe the pressure rise as you turn the hex key by looking at the pressure gauge. Set the regulator to 43 psi, reconnect the vac hose, and the pressure should drop to 34 psi.

Testing the SARD fuel pressure regulator

• Prepare the Vehicle: Park the vehicle on a level surface and ensure the engine is cool. It is recommended to work on a cold engine to avoid any potential hazards associated with hot engine components. Engage the parking brake and block the rear wheels for added safety.
• Disconnect the Battery: Before proceeding, disconnect the negative battery terminal to prevent any accidental electrical shorts during the testing process. This is an important safety precaution.
• Locate the SARD Fuel Pressure Regulator: The SARD fuel pressure regulator is typically located near the fuel rail. Refer to your vehicle's repair manual or seek guidance from online forums specific to your car model if you are unsure of its exact location.
• Depressurize the Fuel System: It is essential to relieve the fuel system pressure before proceeding. Follow the procedure outlined in your vehicle's repair manual. Typically, this involves disconnecting the fuel pump fuse and cranking the engine until it stalls and turns off. This step ensures that the fuel pressure in the lines is released, making it safe to work on the regulator.
• Inspect the Regulator: With the fuel system depressurized, carefully inspect the SARD fuel pressure regulator for any signs of damage, leaks, or wear. Pay close attention to the O-rings, hoses, and fittings. Look for cracks, brittle components, or any signs of fuel leakage. If any issues are identified, address them before proceeding.
• Test Fitting: If you are installing a new SARD fuel pressure regulator or have made adjustments to the existing one, perform a test fitting. Ensure that the regulator sits securely in its designated location and that all connections are properly aligned. Check for any interference with surrounding components, including the bonnet/hood clearance. Make any necessary adjustments or fabrications (such as creating a mounting bracket) to ensure a proper fit.
• Reconnect the Battery: Once you are satisfied with the test fitting, reconnect the negative battery terminal.
• Start the Engine: With the vehicle in a well-ventilated area, start the engine and let it idle. Carefully observe the SARD fuel pressure regulator and the surrounding area for any signs of fuel leaks. Also, listen for any unusual noises that may indicate fuel system issues.
• Check Fuel Pressure: Using a suitable fuel pressure gauge connected to the regulator's fuel pressure sensor port, monitor the fuel pressure. Compare the readings to the specified base fuel pressure for your vehicle. For example, as mentioned in the forum post, the base fuel pressure for a Nissan RB25 should be around 43 psi or 3 Bar with the vacuum hose disconnected. Reconnect the vacuum hose and ensure that the fuel pressure drops to the expected range (34-37 psi in the case of the Nissan RB25).
• Adjust Fuel Pressure (if necessary): If the fuel pressure readings are not within the specified range, carefully adjust the SARD fuel pressure regulator. Refer to the regulator's instructions or seek guidance from online forums specific to your vehicle. Make sure to follow the proper procedure and safety precautions when adjusting the fuel pressure.
• Road Test: After confirming that the SARD fuel pressure regulator is functioning correctly and all connections are secure, take the vehicle for a test drive. Observe the engine's performance, smoothness, and responsiveness during the drive. Ensure that there are no unusual noises or signs of fuel leaks.

By following these comprehensive testing procedures, you can ensure that your SARD fuel pressure regulator is installed and functioning correctly, providing the necessary fuel pressure for optimal engine performance in your high-performance fuel-injected vehicle.

Choosing the right SARD fuel pressure regulator

Compatibility with Fuel System

Before choosing a SARD fuel pressure regulator, it is crucial to understand the type of fuel system your vehicle has. Your vehicle will typically have either a carburetor or an Electronic Fuel Injection (EFI) system. Carburetors are commonly found in older vehicles and operate at lower fuel pressures, around 4 to 7 psi. On the other hand, EFI systems deliver fuel more accurately and run at higher fuel pressures, typically between 30 and 60 psi.

Performance Requirements

Consider the performance requirements of your vehicle. If you have a high-performance engine, it requires a precise balance of fuel pressure to deliver peak power and efficiency. The SARD fuel pressure regulator should be able to provide the correct fuel pressure for your vehicle's specific needs. The SARD Type-R regulator, for example, is designed for high-horsepower, naturally aspirated, and turbocharged engines.

Ease of Installation

Some SARD fuel pressure regulators are designed for easier installation. For instance, the SARD fuel pressure regulator includes a mounting bracket that simplifies mounting in the engine bay. Additionally, consider the complexity of the installation process, such as the need for a return line in return-style regulators.

Adjustability

Look for a SARD fuel pressure regulator that offers adjustability, allowing you to fine-tune the fuel pressure to match your engine's requirements. This feature is particularly useful for EFI systems and setups with carburetors used in conjunction with high-pressure fuel pumps.

Material and Construction

SARD fuel pressure regulators are constructed from high-quality billet aluminium, ensuring durability and performance. The lightweight diaphragm assembly helps dampen pressure spikes caused by high-flow fuel pumps and injectors.

Additional Features

Some SARD fuel pressure regulators include additional features such as a 360-degree adjusting nut, a 1/8PT service hole for installing a fuel pressure gauge, and the ability to accept 8mm hose nipples or AN#6 adapter bolts.

Remember to refer to the specific requirements of your vehicle and select a SARD fuel pressure regulator that meets those needs. A properly chosen and installed fuel pressure regulator will enhance your vehicle's performance, efficiency, and overall driving experience.

Frequently asked questions