Fuelab 51502 Fuel Pressure Regulator - Manual (Page 2)

To Engine Intake Manifold
51502 Regulator
Fuel Gauge Shown in
Gauge Port, Liquid Filled
Gauge may have Error Due
to Temperature Variations.
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.
Y-Block or "T" Fitting,
to Split Flow into Two
Fuel Rail System
Vented Fuel Cell or Fuel Tank.
Tank must be Plumbed According
to Maximum Pump Flow Rate.
Consult Pump Manufacturer's
Specifications and Recommendations.
Follow Fuel Cell Manufacturer's
Recommendations for Proper
Cell Vent Plumbing
Fuel Filter with 60 Micron or
Lower Particle Rating is Required.
Fuelab Filter with 6, 10 or 40
Micron Rating is Recommended.
(2X) Fuel Rails
with Injectors
High Pressure
Electric Fuel Pump
Check Valve Required for Reduced
Vehicle Emissions and Improved
Engine Starting. Valve may be Installed
in Fuel Pump,Typical OEM Pumps
do have this Valve Installed. Consult
Pump Manufacturer's Specifications
105020121-1, Rev A Sheet 2 of 4
Plumbing Planning Notes:
Minimize plumbing restrictions between fuel rail(s) and regulator for peak performance, use –6AN (3/8”) 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 –6AN (3/8”) 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 –6AN plug (not supplied) and supplied –906 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 –6AN Inlet Ports and one –6AN 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.
Plumbing Planning Notes:
Minimize plumbing restrictions between fuel rail(s) and regulator for peak performance, use –6AN (3/8”) 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 –6AN (3/8”) 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 –6AN plug (not supplied) and supplied –906 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 –6AN Inlet Ports and one –6AN 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.