Radium Engineering 89-05 Mazda MX-5 Miata Fuel Hanger (Pumps Not Included)

This fuel hanger completely replaces the factory in-tank fuel pump module and allows 1 or 2 aftermarket pumps to be used. The OEM fuel level sensor is reused. No modifications are required for fitment under the fuel pump access cover.

PREVENTING FUEL STARVATION

• Although not very effective, the OEM internal fuel tank baffle is still used.
• Unlike the factory hanger, this includes a 1-piece anodized aluminum collector box that keeps fuel trapped around the pump inlet(s).
• There are two 1-way fill valves incorporated in the bottom of the collector box that allows fuel in, but not out. Each 1-way fill valve flows 355 LPH.
• As shown below, the collector box is constantly replenished with fuel returning from the pressure regulator.

PORTS AND FITTINGS

The "PUMP OUT" port is tapped with 7/8"-14 (10AN ORB) threads.

• Provided is an SAE quick connect hose end with barbs (shown below) for 89-97 MX-5 fuel lines.
• Provided is a 10AN ORB to SAE quick connect banjo fitting for 99-05 MX-5 fuel lines.
  

The "FUEL RETURN" port is tapped with 3/4"-16 (8AN ORB) threads.

• Provided is an SAE quick connect hose end with barbs (shown above) for 89-97 MX-5 fuel lines.
• Provided is an 8AN ORB to SAE quick connect banjo fitting for 99-05 MX-5 fuel lines.
  

FUEL TANK VARIATIONS

There are multiple fuel tank changes between the 89-05 MX-5. Anodized billet aluminum extension brackets (shown below) with distinct mounting configurations permit compatibility with all fuel tank variations. To retain the different OEM fuel level sensors, an extension mount (shown above) is provided for the later models that have deeper fuel tanks.

FUEL PRESSURE REGULATOR

When installing the pump hanger into a 89-97 MX-5, the OEM fuel pressure regulator is retained. This is mounted on the fuel rail and has no direct correlation with the fuel pump hanger.

When installing the pump hanger into a 99-05 MX-5, the OEM fuel pressure regulator will be removed from the system. An aftermarket FPR is required for these vehicles. There are 2 plug and play options:

• 20-1022 FPR KIT, 99-05 MAZDA MX-5
• FUEL HANGER PLUMBING KIT, 89-05 MX-5

FUEL FILTRATION

• This system includes multiple pre-pump filters for all pumps.
• This system does NOT eliminate the OEM "post" pump fuel filter.

ELECTRICAL

• Depending on the fuel pump and fuel pressure, some single pump installations can re-use the OEM wiring.
• It is recommended to upgrade the wiring to ensure the pump(s) are operating at their full potential.
  
• The in-tank wiring is insulated with high quality chemically resistant ETFE.
• The anti-rotation stainless steel terminals easily handle the high current demand that compact bulkhead connectors lack.
• Serviceable connections are hermetically sealed and impervious to all standard and exotic fuels.
• Non-conductive anodized aluminum acorn nuts (shown below) prevent accidental short circuiting.

FITMENT

• 90-97 Mazda NA Miata
• 99-05 Mazda NB Miata