Radium Engineering Multi-Port Regulator-Rotating Assembly (MPR-RA) is a great solution for both simple and complex high-flow fuel systems. Its unique port configuration makes it ideal for combining dual fuel pumps into a single feed line. Alternatively, it can be used to split a single feed line to a dual bank fuel system with 2 fuel rails. However, it can also be used for single pump or single fuel rail applications by simply plugging the unused ports.This regulator can be plumbed many different ways to suit any installation, such as traditional flow-through or dead-head systems. Because of this flexibility, it eliminates the need for an extra "Y" fitting. The lower 2 opposing return ports are unique in that they flow parallel with the pressure ports eliminating the need for elbow fittings. Either lower port can be used for the return line, just plug the one not used (plugs are included).There are many unique ways to mount this regulator. Wall mounting can be accomplished by using the holes that pass through the body. Alternatively, the regulator can be floor mounted using the provided mounting bracket. It is compatible with all gasoline and alcohol blends of fuel including E85. FUEL PRESSURE ADJUSTMENTRA-series regulators feature the first ever wrench-free pressure adjustment; a jam nut and set screw are no longer required. Simply turn the knob clockwise to increase pressure or counterclockwise to decrease pressure. Furthermore, there are incremental detents that provide haptic feedback to the user. Every detent permits 1psi (+/-0.5psi) of adjustment depending on current fuel pressure. FUEL PRESSURE STABILITYAfter years of track and bench testing, the RA-series regulators have been refined to optimize pressure management. A new single stainless steel return orifice generates laminar flow that enhances stability control.Minimum Pressure: 18.5psi (1.3bar)Maximum Pressure: *N/A*This is rhetorical. The maximum pressure is dependent on the relief valve inside the pump or the maximum current the fuel pump controller allows. 1:1 RISING RATE VACUUM REFERENCERA-series regulators feature a 360 degree swiveling vacuum reference port that is double O-ring sealed. This is a first in the industry. It permits the installer to quickly point the vacuum fitting in any direction.There are 4 interchangeable 10-32 threaded vacuum port fittings provided for all scenarios. 1. Barbed FittingThis is a black zinc-plated 3/16" (5mm) barb machined from high strength steel. It is compatible with the following vacuum hoses: 5/32" (4mm), 3/16" (5mm), and 7/32" (6mm).2. 3AN MaleThis is a black zinc-plated adapter machined from high strength steel. It is compatible with 3AN hose ends.3. Push-To-ConnectThis is a nickel-plated brass fitting with Buna-N O-rings. It is compatible with hard plastic 1/4" OD tubing.4. PlugThis is a black oxide stainless steel screw. It is used to maintain a constant (non dynamic) fuel pressure. Beginning in the mid 1990s, vehicle manufacturers started transitioning to returnless fuel systems to lower EVAP emissions. To keep temperatures lower, these regulators are mounted inside the tank and do NOT have the ability to be vacuum referenced. A plug would be required in this scenario.NOTE: When installing, it is recommended to use a wicking medium-strength threadlocker, such as Loctite 294. INCLUDED-Main Rotating Assembly-Mounting Bracket with Hardware-5mm Barbed Vacuum Fitting-Vacuum Plug Fitting (Returnless)-1/4" Push-To-Connect Vacuum Fitting-3AN Male Vacuum Fitting-6AN ORB plug (x2)-8AN ORB plug (x1)-6AN ORB to 6AN male adapter (x3)-8AN ORB to 8AN male adapter (x1)
