Mallory 4207, 4207M, 4210 Instruction Manual

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 [phone] 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

ADJUSTMENT SCREW

JAM NUT

REGULATOR CAP SCREWS (4)

REGULATOR CAP

OUTLETS TO CARBURETOR
(2 PLACES, 3/8" NPT

FUEL PRESSURE PORT (REAR, 1/8" NPT)

REGULATOR HOUSING

INLET FROM FUEL PUMP (3/8" NPT)

REGULATOR BASEAND
BRACKET SCREWS (4)

REGULATOR BASE

REGULATOR BRACKET (NOT PICTURED)

FIGURE 1

MALLORY IGNITION 550 MALLORY WAY, CARSON CITY, NV 897012

REGULATOR MAINTENANCE
Step 1

Release the jam nut and remove the adjustment
screw. Set aside the diaphragm spring.

Step 2

Remove the four regulator base and bracket screws.

Step 3

Remove the regulator base. Remove the gasket.

Step 4

Set aside the plunger spring and unscrew the plunger.
O-Ring remains on the plunger.

Step 5

Remove the four regulator cap screws.

Step 6

Remove the regulator cap.

Step 7

Remove the diaphragm.

Step 8

Thoroughly clean all surfaces.

Step 9

Assemble in reverse order. Tighten the four regulator
cap and four regulator base and bracket screws
between 16 and 19 in./lbs.

Step 10

Adjust fuel pressure. See Fuel Pressure Adjustment
stated earlier.

REGULATOR SERVICE PARTS KIT

(INCLUDES FUEL TYPE CONVERSIONS AS NOTED

) PART NO.

Diaphragm kit, gasoline, RFG (reformulated gas,
oxygenated fuel)

For Regulator Part Nos. 4207 and 4207M with round
regulator cap and fuel pressure port. Also used to
convert Regulator Part No. 4210 to use gasoline. 3149

Diaphragm kit, Alcohol/Methanol

For Regulator Part No. 4210. Also used to convert
Regulator Part No. 4207 with round regulator cap and
fuel pressure port to use alcohol/methanol. 3149

MALLORY IS A DIVISION OF THE MR. GASKET PERFORMANCE GROUP
550 MALLORY WAY, CARSON CITY, NEVADA 89701
[phone] FAX [phone]
www.mrgasket.com

FORM 1385

(REV. D) 06/03

Made in U.S.A.

Printed in U.S.A.

FIGURE 2

CARB

FUEL

FILTER

REGULATOR

FUEL PRESSURE

PORT

FUEL PRESSURE GAUGE

AND ISOLATOR

FUEL

PUMP

FUEL

FILTER

FUEL
TANK

JAM NUT

ADJUSTMENT SCREW

REGULATOR CAP SCREWS (4)

REGULATOR CAP

DIAPHRAGM SPRING

DIAPHRAGM

REGULATOR HOUSING

GASKET

O-RING
PLUNGER

REGULATOR BASE

REGULATOR BASE AND
BRACKET SCREWS (4)

REGULATOR BRACKET