Fuelab 51504 Fuel Pressure Regulator - Manual

Adjustment Screw
Bracket
Regulator
Barbed Fitting
Plug
Flat Washer
Jam Nut
(3X) -906 O-ring
(3X) Bracket Lock Washers (3X) Bracket Screws
105020124-1, No Rev Page 1 of 4
Model Number 51504
Fuel Pressure Regulator
Operating and Installation Instructions
C C A A U U T T I I O O N N ! !
This product is to be installed only by persons knowledgeable in the repair and modification of vehicle fuel systems
and general vehicle systems modification. Only a qualified technician or mechanic who is aware of applicable
safety procedures should perform the installation of this product.
GASOLINE AND OTHER FUELS ARE FLAMMABLE AND CAN BE EXPLOSIVE!
Perform the installation in a well ventilated location only to minimize the build up of fuel vapors. NO open flames,
smoking or other sources of ignition are to be present during installation, to prevent fire or explosion that can cause
serious injury or death. Grinding, cutting, and drilling must be performed with care to prevent ignition. Draining and
removal of all fuel and ventilation of vapors in vehicle and fuel system is recommended when performing such
procedures. Proper eye and personal protection is required at all times during installation.
W W A A R R N N I I N N G G ! !
The Vehicle’s fuel system may be under pressure! Do not loosen any fuel connections until relieving all fuel system
pressure. Consult an applicable service manual for instructions to relieve fuel system pressure safely.
This product is intended for racing, off-road, or marine use only. This fuel system component is capable of altering
engine tuning and therefore not legal for sale or use on emission controlled motor vehicles.
Product Contents:
Check the diagram and list of components
(right) to ensure that no components are
missing from box. Contact your Fuelab
distributor immediately for replacement.
51504 Features and Performance Ratings:
Inlet Port Sizes -6AN Military Port
Seat Size Large
Regulation Slope 0.75 PSI/GPM
Maximum Flow
Capacity
2.5 GPM at 5 PSID
(570 LPH at 0.35 Bar)
Pressure
Adjustment Range
Pressure Range “E”
4-12 PSID
(0.28-0.82 Bar)
WARNING! Exceeding maximum flow capacity may result in an over-pressure operating condition.
Before Installation, Plan Entire Fuel System:
These instructions are limited to general topics of regulator component installation and may not include specific
information pertaining to your application. These instructions are written assuming the use of an electric fuel pump
capable of at least 15 PSIG outlet pressure and limited to the specified Maximum Flow Capacity (above). This
regulator has an internal spring that can be changed for other pressure ranges, including “L” range, for 1.5-3.5
PSID, “T” range for 10-25 PSID, if required by the specific application. Higher, fuel injection pressure ranges are
recommended for a different model of regulator (unless for very high flow EFI applications). Visit our company
website for specific details pertaining to example fuel systems and other solution ideas. Additional information
including advanced troubleshooting, any special alerts and FAQ’s pertaining to this and other products is also
available.
General Regulator Performance Notes:
The notation “PSIG” means pressure in Pounds per Square Inch (PSI) relative to the prevailing atmospheric
condition or outside air. This is referred to as Gauge Pressure. The notation “PSID” means pressure in PSI relative
to another pressure source or called the Differential Pressure (relative to Pressure Reference Port in case of
pressure ratings). This regulator acts as a relief valve to control pressure (returning fuel back to fuel cell). Only
“blow-through” boosted applications for carbureted systems should have a line plumbed to the pressure reference
port. The amount of pressure difference to expect with application of full throttle compared to idle (for naturally
aspirated engines) is a function of how much flow the engine is using (reference Regulation Slope, above for
calculations).
Model Number 51504
Fuel Pressure Regulator
Operating and Installation Instructions
C C A A U U T T I I O O N N ! !
This product is to be installed only by persons knowledgeable in the repair and modification of vehicle fuel systems
and general vehicle systems modification. Only a qualified technician or mechanic who is aware of applicable
safety procedures should perform the installation of this product.
GASOLINE AND OTHER FUELS ARE FLAMMABLE AND CAN BE EXPLOSIVE!
Perform the installation in a well ventilated location only to minimize the build up of fuel vapors. NO open flames,
smoking or other sources of ignition are to be present during installation, to prevent fire or explosion that can cause
serious injury or death. Grinding, cutting, and drilling must be performed with care to prevent ignition. Draining and
removal of all fuel and ventilation of vapors in vehicle and fuel system is recommended when performing such
procedures. Proper eye and personal protection is required at all times during installation.
W W A A R R N N I I N N G G ! !
The Vehicle’s fuel system may be under pressure! Do not loosen any fuel connections until relieving all fuel system
pressure. Consult an applicable service manual for instructions to relieve fuel system pressure safely.
This product is intended for racing, off-road, or marine use only. This fuel system component is capable of altering
engine tuning and therefore not legal for sale or use on emission controlled motor vehicles.
Product Contents:
Check the diagram and list of components
(right) to ensure that no components are
missing from box. Contact your Fuelab
distributor immediately for replacement.
51504 Features and Performance Ratings:
Inlet Port Sizes -6AN Military Port
Seat Size Large
Regulation Slope 0.75 PSI/GPM
Maximum Flow
Capacity
2.5 GPM at 5 PSID
(570 LPH at 0.35 Bar)
Pressure
Adjustment Range
Pressure Range “E”
4-12 PSID
(0.28-0.82 Bar)
WARNING! Exceeding maximum flow capacity may result in an over-pressure operating condition.
Before Installation, Plan Entire Fuel System:
These instructions are limited to general topics of regulator component installation and may not include specific
information pertaining to your application. These instructions are written assuming the use of an electric fuel pump
capable of at least 15 PSIG outlet pressure and limited to the specified Maximum Flow Capacity (above). This
regulator has an internal spring that can be changed for other pressure ranges, including “L” range, for 1.5-3.5
PSID, “T” range for 10-25 PSID, if required by the specific application. Higher, fuel injection pressure ranges are
recommended for a different model of regulator (unless for very high flow EFI applications). Visit our company
website for specific details pertaining to example fuel systems and other solution ideas. Additional information
including advanced troubleshooting, any special alerts and FAQ’s pertaining to this and other products is also
available.
General Regulator Performance Notes:
The notation “PSIG” means pressure in Pounds per Square Inch (PSI) relative to the prevailing atmospheric
condition or outside air. This is referred to as Gauge Pressure. The notation “PSID” means pressure in PSI relative
to another pressure source or called the Differential Pressure (relative to Pressure Reference Port in case of
pressure ratings). This regulator acts as a relief valve to control pressure (returning fuel back to fuel cell). Only
“blow-through” boosted applications for carbureted systems should have a line plumbed to the pressure reference
port. The amount of pressure difference to expect with application of full throttle compared to idle (for naturally
aspirated engines) is a function of how much flow the engine is using (reference Regulation Slope, above for
calculations).