1
2-PORT FUEL PRESSURE REGULATORS
PART NO. 4207, 4207M and 4210
INSTALLATION INSTRUCTIONS
FORM 1385 (REV. D) 06/03
GENERAL INFORMATION
The 2-Port Regulator is designed to regulate fuel
pressure between high pressure fuel pumps and
carburetors. The regulator is recommended for Mallory
COMP PUMP® 140 Series Electric Fuel Pump. Also,
recommended for Mallory High Performance and
Competition Mechanical Fuel Pumps.
MOUNTING PROCEDURE
The regulator may be mounted at any angle. For
maximum efficiency, mount the regulator as close
as possible to the carburetors. DO NOT mount the
regulator on or near exhaust manifolds.
A bracket is provided for convenient mounting under
an intake bolt. Loosen the four regulator base and
bracket screws. Remove two of these screws.
Position the bracket over the two screw holes. Install
the two screws. Tighten the four screws between 16
and 19 in./lbs.
FITTINGS AND FUEL LINE
Purchase fittings (and plugs) as necessary. Use a
thread sealant compound on the fitting threads. You
can find thread sealant compound at a hardware
store. Do not use Teflon tape. Install the fittings. Do
not overtighten the fittings. This could damage the
regulator. Connect the fuel lines. See Figures 1 and 2.
FUEL PRESSURE ADJUSTMENT
NOTE: Engine must be running when adjusting
fuel pressure.
Step 1
Connect a fuel pressure gauge to the fuel pressure
port.
Step 2
Release the jam nut on the adjustment screw.
Step 3
Start the engine. (Check the fuel system for fuel leaks.
Shut off the engine and correct any fuel leaks before
proceeding.)
Step 4
Adjust fuel pressure. Turn adjustment screw clockwise
to increase fuel pressure or counterclockwise to
decrease fuel pressure. Rev the engine slightly several
times. Check fuel pressure. Repeat if necessary.
Step 5
Tighten jam nut and shut off engine.
MALLORY TECHNICAL SUPPORT (775) 882-6600 www.mrgasket.com
FUEL APPLICATION
Part No. 4207 Gasoline, Automotive/Street and
Racing
Part No. 4207M Gasoline, Marine
Part No. 4210 Alcohol/Methanol,
Automotive/Street and Racing
PARTS INCLUDED IN THIS KIT
1 2-Port Fuel Pressure Regulator
1 Regulator Bracket
1 Plug, 1/8" NPT
SPECIFICATIONS:
Inlet and outlet port thread sizes: 3/8" NPT
Fuel pressure port thread size: 1/8" NPT
Fuel pressure adjustment range: 4–12 PSI
Maximum inlet pressure: 20 PSI
