Fuelab 55501 Fuel Pressure Regulator - Manual

Jam Nut
(3X) -908
Regulator Adjustment Screw
Port Filter
DO NOT LOOSEN
(3X) Bracket Lock Washers
Flat Washer
Bracket
Part of Regulator.
O-rings
Plug
(3X) Bracket
Screws
105020521-1, Rev A Sheet 1 of 4
Model Number 55501-c
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.
55501-c Features and Performance Ratings:
Inlet Port Size -8AN Military Port
Outlet Port Sizes -8AN Military Port
Regulation Slope 0.8 PSI/GPM
Maximum Flow
Capacity
160 GPH with 20 PSI Inlet
(600 LPH at 1.4 Bar Inlet)
Pressure
Adjustment Range
Pressure Range “C”
4-12 PSID
(.3 – .8 Bar)
WARNING! Exceeding maximum inlet pressure (45 PSI) 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 internally relieved
electric fuel pump with 45 PSIG maximum outlet pressure. Some high pressure pumps may be used with regulator,
but will require a bypass or relief, plumbed prior to inlet of regulator. This regulator has an internal spring that can
be changed for other pressure ranges, including “L” range, for 1-3 PSID and “T” range for 10-25 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 (relative to Pressure Reference Port in case of
pressure ratings). This regulator acts via restriction to control pressure (restricting fuel between inlet and outlet
ports). Only “blow-through” boosted applications for carbureted systems should have a line plumbed to the
pressure reference port. “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).