78 PSI Static The opening and closing of fuel injectors creates 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 The FPD s internal diaphragm will absorb oscillating pulses and stabilize fuel pressure This correction can be measured throughout the RPM range and can often help idle surge especially with high flow injectors Furthermore a fuel pulse damper can help solve erratic lean air fuel ratio spikes commonly experienced as stumbling that are difficult to tune out In-Line Fuel Pulse DampersThe FPD-R green top is slightly shorter than the FPD-XR black top allowing it to be used in space- constrained applications Parts Included-Anodized laser engraved aluminum top XR extra range-Anodized aluminum body threaded for -8AN ORB fittings-Anodized aluminum O-ring sealed adapter fittings 6AN-Stainless steel M6 mounting bolts and nuts-Rubber vacuum hose 4mm ID-Vacuum hose Y-fitting