Model Number 56501-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.
56501-c Features and Performance Ratings:
Inlet Port Sizes -10AN Military Port
Return Port Size -10AN Military Port
Regulation Slope < 1 PSI/GPM
Maximum Flow
Capacity
8.0 GPM at 25 PSID
(1800 LPH at 1.7 Bar)
Pressure
Adjustment Range
Pressure Range “E”
25-65 PSID
(1.7 – 4.5 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 80 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 “C” range for 4-12 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. The intake manifold pressure, when plumbed to the
regulator, changes the fuel pressure in a 1:1 ratio. When the engine idles (for example 12 Inches of Mercury or 6
PSIG of vacuum) fuel rail pressure will lower 6 PSI, when compared to the setting with the engine off. For boosted
applications, including turbo or superchargers, fuel rail pressure increases at a 1:1 ratio. An engine at 10 PSIG of
boost as measured in the intake manifold, will increase the fuel pressure by 10 PSIG. 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. The amount of pressure difference to expect is a
function of how much flow the engine is using (reference Regulation Slope, above).
(3X) -910 O-ring
Regulator
Bracket
Barbed FittingAdjustment Screw
Plug
(3X) Bracket Lock WashersFlat Washer Jam Nut
(3X) Bracket Screws
105020621-1, No Rev Sheet 1 of 4
(4 paginas)
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