Radium Engineering 99-05 Mazda MX-5 RA-Series Fuel Pressure Regulator Kit

This kit features a new adjustable fuel pressure regulator (FPR) that is compatible with all fuel pump hangers including the factory returnless system found in the NB chassis. As shown below, the FPR is mounted near the EVAP charcoal canister using OEM threaded studs.

The OEM fuel feed line from the fuel pump to the fuel filter is reused and unaltered. However, two new 6AN fuel lines are provided to and from the FPR.

A fuel pressure gauge mounts adjacent to the FPR on the feed line for easy adjustment. A stainless steel SAE quick connect plug is provided to block off the "TEE" on the OEM feed line.

1:1 RISING RATE VACUUM REFERENCE

The RA-series regulator features a 360 degree swiveling vacuum reference port that is double O-ring sealed. This is the first in the industry. It permits the installer to quickly point the vacuum fitting in any direction with no tools required.

There are 4 interchangeable 10-32 threaded vacuum port fittings provided to cover all scenarios:

• Barbed Fitting: A black zinc-plated 3/16" (5mm) barb machined from high strength steel that is compatible with the following vacuum hoses: 5/32" (4mm), 3/16" (5mm), and 7/32" (6mm)
• 3AN Male Fitting: A black zinc-plated adapter machined from high strength steel that is compatible with 3AN hose ends
• Push-To-Connect: A nickel-plated brass fitting with Buna-N O-rings that is compatible with hard plastic 1/4" OD tubing
• Vacuum Plug: A black oxide stainless steel screw that is used to maintain a constant (non dynamic) fuel pressure. To keep fuel pressure the same as the OEM MX-5 fuel system, this plug should be used

NOTE: When installing the vacuum fitting, it is recommended to use a wicking medium-strength threadlocker.