Rajan Wilcox
The Tomei Fuel Pressure Regulator is a highly adjustable regulator that ensures stable pressure is supplied with an oversized diaphragm. The regulator is made from billet aluminium with a hard anodized finish to withstand the extreme conditions in the engine bay. Tomei's regulator has a pressure range of 2.0kgf/cm2 to 8.0kgf/cm2 and can be adjusted by loosening the lock nut and then turning a hex key to raise or lower the pressure.
| Characteristics | Values |
|---|---|
| Material | Billet aluminium |
| Finish | Hard anodized |
| Fittings | AN6 1/8x2, #8 Straight 1/8NPTx2 |
| Pressure adjustability | 2.0kgf/cm²~8.0kgf/cm² |
| Diaphragm size | 33mm or 50mm |
| Type | Type S (General Tuning), Type L (High flow, big power, high boost) |
| Installation | Universal, but may require additional parts |
| Self-adjusted | Yes |
What You'll Learn
The Tomei Fuel Pressure Regulator is self-adjusting
The regulator is made from billet aluminum with a hard anodized finish, ensuring durability and protection from the extreme conditions in the engine bay. This finish also adds electrical insulation and resistance to corrosion and heat, maximizing the regulator's longevity and safety.
The Tomei Fuel Pressure Regulator is particularly useful when upgrading to a larger flow setup, as the stock fuel pressure regulator may not be sufficient to handle the required pressures. The oversized diaphragm in the Tomei regulator ensures stable pressures are supplied, even with adjustments made to the setup.
The regulator comes with the popular AN6 and #8 nipple connectors, making it ready to install and use out of the box. However, depending on your vehicle's setup, additional equipment and piping may be required for a complete installation.
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Clockwise increases pressure, counter-clockwise decreases it
The Tomei Fuel Pressure Regulator is designed to ensure stable pressure is supplied to the fuel pump and injectors. It features a large diaphragm, which allows for greater flow and accuracy adjustability. Clockwise increases pressure, and counter-clockwise decreases it. This is a simple and effective way to fine-tune the fuel pressure to your desired level.
To adjust the Tomei Fuel Pressure Regulator, you will need to locate the adjustment nut. This is usually found on the side or top of the regulator. Before making any adjustments, it is important to depressurise the fuel lines by removing the fuel pressure. You can do this by simply unplugging the fuel cap and pulling the fuel pump fuse. Once the fuel lines are depressurised, you can then proceed to adjust the regulator.
When adjusting the regulator, it is crucial to work with caution as you will be dealing with fuel. Make sure to have a properly sized screwdriver or ratchet to avoid damaging the screws. Start by loosening the lock nut on the adjustment nut. Then, using a hex key, turn it in the desired direction to increase or decrease pressure. Turning the hex key clockwise will increase the fuel pressure, while turning it counter-clockwise will decrease the pressure. Make sure to refer to your vehicle's specifications to determine the correct fuel pressure level.
It is important to note that the fuel pressure regulator should be adjusted with the vacuum hose disconnected. For a Nissan RB25, the base fuel pressure without the vacuum hose should be around 43 psi or 3 Bar. Once you have adjusted the regulator to the desired pressure, you can reconnect the vacuum hose, which will result in a slight drop in pressure. For the Nissan RB25, the fuel pressure with the vacuum hose connected should be around 34-37 psi.
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The regulator should be placed after the fuel rail
The fuel filter should go to the gauge, then to the fuel rail, then to the Nismo adapter, then to the FPR, and finally, the return line. The fuel filter goes to the Nismo adapter, then to the fuel rail, then to the return line, then to the gauge, then to the FPR, and finally, the return line.
The stock fuel pressure regulator is located before the fuel rail. However, the fuel filter goes to the fuel rail, then to the FPR, and then back to the tank. This is the same for an aftermarket FPR.
The FPR is usually placed near the stock FPR. All of the Japanese branded ones have a version that bolts onto the stock location and fuel rail.
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The stock fuel pressure regulator may not be enough for a larger flow setup
When upgrading to a larger flow setup, the stock fuel pressure regulator will not be able to handle the required pressures. This is because the stock fuel pressure regulator is preset from the factory for a standard setup and is non-adjustable, restricting the tuning potential of the car.
The TOMEI Fuel Pressure Regulator, on the other hand, is adjustable and ensures stable pressures are supplied with its oversized diaphragm. This special design has proven to maintain the required pressure levels with any adjustments made. The regulator is made from billet aluminium with a hard anodized finish to cope with the extreme conditions in the engine bay. The hard anodizing finish adds more protection to the regulator, helping to protect it from harmful grit and grime, corrosion, heat, and electrical insulation, thus maximizing its durability and safety.
The TOMEI Fuel Pressure Regulator is supplied with two of each AN6 and #8 nipple connectors, which are the most common types of fitments for fuel piping. It is ready to install and use straight out of the box, although depending on your setup, you may require additional equipment or parts to complete the installation.
When the engine is idling low, the fuel flow used is only approximately 15% of the fuel that is sent by the pump, with the rest returned to the fuel tank. When the engine is tuned, optimum efficiency can be obtained with the optimum mixture of the A/F ratio. If the fuel pump is too large and the regulator is not strong enough to handle the excess fuel, it will not be able to regulate the flow, causing the fuel pressure to be too high. This will lead to issues such as over-enrichment, poor fuel efficiency, and operational problems.
Therefore, when upgrading to a larger flow setup, it is essential to also upgrade to an adjustable fuel pressure regulator, such as the TOMEI Fuel Pressure Regulator, to ensure that the required pressures can be maintained and that the tuning potential of the car is not restricted.
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The regulator is shipped with AN6 and #8 nipple connectors
The Tomei Fuel Pressure Regulator is shipped with two AN6 and two #8 nipple connectors, which are the most common types of connectors for fuel piping. This means that the regulator is ready to install and use straight out of the box. Depending on your setup, you may need to purchase additional equipment or parts to complete the installation. Other piping is required and is not included with the regulator.
The AN6 and #8 nipple connectors are supplied with the regulator to ensure that it is compatible with a wide range of vehicles. The regulator's adjustability for pressure range 2.0kgf/cm2 ~ 8.0kgf/cm2 also adds to its versatility.
The Tomei Fuel Pressure Regulator is designed to maintain stable fuel pressures, thanks to its oversized diaphragm. This special design has been proven to maintain the required pressure levels, even with any adjustments made. The regulator is made from billet aluminium with a hard anodized finish to withstand the extreme conditions in the engine bay while maintaining a sleek appearance.
The Hard Anodizing finish on the Tomei Fuel Pressure Regulator adds an extra layer of protection. This finish helps to protect the thick membrane from harmful grit and grime, while also providing additional resistance to corrosion, heat, and electrical insulation. These features work together to maximize the regulator's durability and safety.
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Frequently asked questions
Clockwise is more pressure and counter-clockwise is less. You don't have to remove the vacuum line to adjust it, but doing so will increase the fuel pressure a little bit.
30 to 34 psi with the vac hose connected, 45 to 47 psi with the vac hose disconnected.
The installation of an aftermarket fuel pressure regulator allows for the adjustment of fuel pressure to suit larger aftermarket injectors and other engine modifications. They are also necessary to regulate and flow increased volumes of fuel pumped by high-flow aftermarket fuel pumps.
First, depressurize the fuel lines. Then, remove your old FPR. Next, pull out the old FPR upwards and away from the fuel rail. Once it's out, you will notice it has a rubber o-ring. Normally, you would replace this ring. Then, pull the FPR from the fuel return line. Now you can start test-fitting the new FPR.
