Model Number 56502-c
Fuel Pressure Regulator
Operating and Installation Instructions
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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.
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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.
56502-c Features and Performance Ratings:
Inlet Port Sizes -10AN Military Port
Return Port Size -10AN Military Port
Regulation Slope < .5 PSI/GPM
Maximum Flow
Capacity
5.0 GPM at 5 PSID
(1100 LPH at .35 Bar)
Pressure
Adjustment Range
Pressure Range “E”
4-12 PSID
(.3 – .8 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 20 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 “T” range, for 12-25 PSID
and “E” range for 25-65 PSID, if required by the specific application. 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. Only “blow-through” boosted applications for
carbureted systems should have a line plumbed to the pressure reference port (Plumbed to induction tube, same
pressure as float bowl vent). “Blow-through” applications will have limitations based on inlet fuel pressure and boost
pressure. 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). The actual readings of pressure in a real world application would show a lower pressure, as the
engine is using fuel that would normally be returning back through the return line when the engine is off or at idle.
Barbed Fitting
(3X) -910 O-ring
Flat Washer
Plug
(3X) Bracket Lock Washers
Regulator
Jam Nut
Bracket
Adjustment Screw
(3X) Bracket Screws
Filter
105020622-1, No Rev Sheet 1 of 4
(4 paginas)
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