Fuelab 56504 High Flow Fuel Pressure Regulator - Manual (Page 2)

Plumbing Planning Notes:
Minimize plumbing restrictions between fuel rail(s) and regulator for peak performance, use –8AN (1/2”) to –10AN
(5/8”) line as required per flow rate requirements of the vehicle’s engine and fuel pump. Typical performance EFI
applications use a “Y” block or “T” fitting to split the output of the fuel pump into one end of each fuel rail (for dual
fuel rail application). The opposite end of each fuel rail is plumbed to the Inlet Ports of the regulator. Plumb the
return line back to the fuel tank. Use of a –8AN (1/2”) or -10AN (5/8”) return line is typically recommended for this
model of regulator. See diagram on next page as well as diagram below, to identify the ports used on the regulator.
If only one fuel rail is used for the application, use a –10AN plug (not supplied) and supplied –910 O-ring to plug the
unused Inlet Port (“Y” block or “T” fitting not required in this case). The fuel line used must handle high pressure.
The use of fuel line such as stainless steel braided line and “AN” style fitting connections is recommended. The fuel
ports (two –10AN Inlet Ports and one –10AN Return Port) use “AN” or “military” style fittings. This plumbing
standard is commonly used with racing and high performance applications. See step 6 on next page for additional
information on this port standard. A fuel filter with a 60 micron or lower particle rating is required to be used
upstream of regulator and downstream from fuel pump to protect it and the fuel injectors from foreign object
damage. Reference the Schematic Diagram below for filter locations. Use of a liquid filled gauge exposed to
engine compartment heat is not recommended as the liquid inside the gauge may exert measurement errors. DO
NOT plumb gauge port to any gauge mounted inside the vehicle or in passenger compartment. A line burst can
spill fuel inside passenger compartment and on occupants, possibly causing serious injury or death. An electric
gauge or pressure transducer system is recommended for readings in a passenger compartment.
Typical EFI V-8 Fuel System Schematic Diagram:
Installation Steps:
1. Disconnect the ground terminal from battery and allow the vehicle’s engine and exhaust system to cool.
Relieve fuel system per applicable service manual. Follow all Warnings and Cautions written on previous page
of these instructions.
2. Modify, remove or replace other fuel system components as required per established build plan (reference
notes on previous page and above).
3. Use the supplied bracket as a drilling template to mark holes for mounting bracket. Choose a location that
minimizes exposure to excessive heat, near fuel rails. Mounting bracket can be modified as required. Use
clear or colored enamel paint to protect bracket surface after any modification.
56504-c Regulator
Fuel Gauge Shown in
Gauge Port, Liquid Filled
Gauge may have Error Due
to Temperature Variations.
Fuel Pump,
Fuelab Prodigy 42402 Series
Fuel Pump Recommended.
Capacity of Regulator is
Sufficient to Support Most
Mechanical Pumps
to Maximum Pump Flow Rate.
Consult Pump Manufacturer's
Specifications and Recommendations.
Vented Fuel Cell or Fuel Tank.
Tank must be Plumbed According
Follow Fuel Cell Manufacturer's
Recommendations for Proper
Cell Vent Plumbing
Y-Block or "T" Fitting,
to Split Flow into Two
Fuel Rail System
Fuel Filter with 60 Micron or
Lower Particle Rating is Required.
Fuelab Filter with 6, 10 or 40
Micron Rating is Recommended.
Check Valve May be Required for Reduced
Vehicle Emmissions and Improved Engine
Starting. Fuelab Integrated Check Valve / Filter
Shown.
Fuel Straining Filter Required, Typical
Micron Rating: 75-150, Fuelab
75 Micron Filter Recommended. Straining
Filter may be Installed in Fuel Pump,
Consult Pump Manufacturer's Specifications.
(2X) Fuel Rails
with Injectors
105020624-1, No Rev Sheet 2 of 4