This product IS NOT intended to be used directly on a fuel rail port. The FPR-D can be mounted any direction including upside down. A laser cut anodized aluminum mounting plate with countersink M6x1mm bolts/nuts are included. The FPR-D assembly features two M6x1mm threaded mounting holes. When installing, the NPT fitting requires PTFE paste for proper sealing. A plug is included if this port will not be used. This Radium fuel pressure gauge is commonly used. The 1/8" NPT auxilary port can be used for monitoring fuel pressure, temperature, etc. When installing, the O-rings require petroleum oil for lubrication. Two -6AN and two -8AN adapter fittings are included to suit most aftermarket fuel systems.
The inlet (side) port and outlet (bottom) port feature large 10AN ORB (7/8"-14) threaded ports. NOTE: Base pressure is measured with the fuel pump running without a vacuum line connected to the regulator. Any dynamic fuel pressure created by the rising rate FPR outside of this range is acceptable assuming the vacuum/boost reference line is connected. The base pressure requirement for maximum damping efficiency is 40-120psi (2.8-8.3bar). The integrated 1:1 fuel pulse damper stabilizes fuel pressure created by the fuel pressure regulator, fuel pump, fuel injectors, etc. Unlike many others, the stainless steel adjustament screw has super fine threads for resisting vacuum/boost leaks and fine tuning fuel pressure. Furthermore, with the addition of interchangeable return orifices, the regulator is a good match for big to small powered engines.įuel pressure is dialed in using the preload set screw on top. This added precision will resist diaphragm flutter and optimize pressure stability. Two interchangeable orifices are included to match the amount of fuel bypassed for the application. The 1:1 vacuum reference high flow design has been tested to regulate over 1,400 liters per hour (see MORE DETAILS tab). The FPR-D is compatible with all gasoline and alcohol blends of fuel including E85. It is a fully functional high performance pressure regulator with a unique built-in fuel pulse damper, an industry first. The difference between FPD-R and FPD-XR, is that the FPD-R is slightly shorter than the FPD-XR allowing it to be used in space-contained applications (see images).The Fuel Pressure Regulator-Damper (FPR-D) is the ultimate solution for consolidating critical fuel system components into a high-flow package. This product is safe for use with all fuel types including alcohol blends such as E85. Like any fuel system part, the FPD kit should be kept away from areas with excessive heat. For best results, the damper should be plumbed as close to the fuel rail(s) as possible. Using the supplied M6 bolts/nuts, the FPD In-line kit can be mounted at any possible angle including upside down. These fittings seal to the billet housing using Viton O-rings. Depending on the size of the fuel feed hose used, there are 3 kits to choose from which include different male adapter fittings (AN6, -AN8, -AN10).
The kit features an anodized aluminium housing with a large 0.69" center bore that uses two in-line inlet/outlet ports that are machined with 3/4"-16 UNF threads for AN8 ORB fittings. This becomes essential for boosted systems that use a 1:1 rising rate fuel pressure regulator. Furthermore, a fuel pulse damper can help solve erratic lean air/fuel ratio spikes, commonly experienced as "stumbling", that are difficult to tune out.Īlong with having the flexibility of using common fittings, Radium Engineering FPD's use a vacuum/boost reference port which allows for proper fuel pulse damper performance even at elevated fuel pressures. This correction can be measured throughout the RPM range and can often help idle surge, especially with high flow injectors. The FPD's internal diaphragm will absorb oscillating pulses and stabilize fuel pressure. In order to achieve a safe and consistent rail pressure, a fuel pulse damper (FPD) is often necessary. The opening and closing of fuel injectors creates pressure pulses in the fuel rail which can lead to unstable fuel pressure. Radium Engineering In-Line Fuel Pulse Dampers allows for proper fuel pulse damper performance even at elevated fuel pressures, and are very easy to install.
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