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Radium fuel pulse damper install11/22/2023 ![]() ![]() This is done with a spring loaded flexible diaphragm inside the damper.īelow is a graph showing fuel pressure fluctuations on a 4-cylinder engine, with and without a Radium fuel pulse damper installed. The fuel pulse damper works by allowing the volume of the fuel system to change slightly to absorb the pulses. These pulsations can be large enough to hear and feel, but are often undetectable with a liquid-filled analog mechanical fuel pressure gauge because they happen so quickly. Under certain circumstances, they can also cause issues with fuel delivery to the engine. These hydraulic pulses can cause an undesirable noise, which can be transmitted to the passenger compartment. Radium Engineering fuel pulse dampers are designed for use with high performance fuel systems, so damper benefits can be realized.Īn FPD is used in fuel injection systems to attenuate (absorb) pressure pulsations generated by the fuel pump operating and by the injectors opening/closing. these dampers are no longer as effective, or they must be removed for modifications. When modifications are made to the fuel pump, fuel rails, injectors, etc. OEM-grade fuel pulse dampers are specifically designed for the factory fuel system. Formerly only seen on OEM fuel systems, Radium Engineering is the first to introduce the FPD to the high- performance aftermarket. Download the installation instructions for more info.For many years Radium has been touting the benefits of a fuel pulse damper (FPD) in fuel injected systems. This product is safe for use with all fuel types including alcohol blends such as E85. For best results, the damper should be mounted directly onto the fuel rail(s). The FPDs can be mounted at any possible angle including upside down. The 8AN ORB ( 3/4"-16 UNF threads) version seals using a Viton O-ring while the 3/8" NPT variation seals with the tapered pipe threads. The anodized aluminum housing features two selectable threaded male fittings. Base static fuel pressure exceeds the 40-70psi requirement. Also, the vacuum/boost reference line does not need to be installed since maximum fuel pressure does not exceed 120psi.Ĭan I use a FPD-R? No. However, the vacuum/boost reference line must be installed.Ĭan I use a FPD-XR? Yes. Even though fuel pressure is 73.5psi at full boost, the FPD-R will work because the base static pressure was set within the 40-70psi requirement. Any dynamic fuel pressure created by a rising-rate FPR outside of this range is acceptable, but only when the base "static" fuel pressure is set within these ranges and the vacuum/boost reference line is connected.Ĭan I use a FPD-R? Yes. IMPORTANT: The ranges above are base static fuel pressures only. The FPD- R (Fuel Pulse Damper- Range) and FPD- XR (Fuel Pulse Damper- Extra Range) both have unique base "static" fuel pressure requirements:įPD-R base pressure requirement = 40 - 70psi (static)įPD-XR base pressure requirement = 40 - 120psi (static)īase pressure is the fuel pressure measured when the fuel pump is running WITHOUT a vacuum line connected to the regulator. The FPD-R (green top) is slightly shorter than the FPD-XR (black top) allowing it to be used in space-contrained applications. What is the difference between FPD-R and FPD-XR? ![]() 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.įor more in-depth information on the function of fuel pulse dampers, read the Radium blog HERE.Īlong with having the flexibilty 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. The opening and closing of fuel injectors create pressure pulses in the fuel rail which can lead to unstable fuel pressure. In order to achieve a safe and consistent rail pressure, a fuel pulse damper (FPD) is often necessary. HAS BEEN UPDATED TO FEATURE A SWIVELING BODY.
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