Mallory Ignition 4207, 4210 User Manual
FORM 1385 (REV. E) 01/12
INSTALLATION INSTRUCTIONS
2-PORT FUEL PRESSURE REGULATORS
PART NO. 4207, 4207M and 4210
PARTS INCLUDED IN THIS KIT
1 2-Port Fuel Pressure Regulator
1 Regulator Bracket
1 Plug, 1/8” NPT
FUEL APPLICATION
Part No. 4207 Gasoline, Automotive/Street and
Racing
Part No. 4207M Gasoline, Marine
Part No. 4210 Alcohol/Methanol,
Automotive/Street and Racing
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
FIGURE 1
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 BASE AND
BRACKET SCREWS (4)
REGULATOR BASE
REGULATOR BRACKET (NOT PICTURED)
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
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 thread sealing 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 www.mallory-ignition.com
1
FIGURE 2
FUEL PRESSURE GAUGE
AND ISOLATOR
FUEL PRESSURE
CARB
FUEL
FILTER
REGULATOR
PORT
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.
FUEL
PUMP
FUEL
FILTER
FUEL
TANK
JAM NUT
ADJUSTMENT SCREW
REGULATOR CAP SCREWS (4)
REGULATOR CAP
DIAPHRAGM SPRING
DIAPHRAGM
REGULATOR HOUSING
GASKET
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 TRADEMARK OF PRESTOLITE PERFORMANCE
10601 MEMPHIS AVE. #12, CLEVELAND, OH 44144
216.688.8300 FAX 216.688.8306
2
www.mallory-ignition.com MALLORY
O-RING
PLUNGER
REGULATOR BASE
REGULATOR BASE AND
BRACKET SCREWS (4)
REGULATOR BRACKET
FORM 1385
(REV. E) 01/12
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