Mallory Ignition Mallory 3-PORT COMPETITION FUEL PRESSURE REGULATOR (RETURN STYLE) 4309 - Manual

3-PORT COMPETITION
FUEL PRESSURE REGULATOR
(RETURN STYLE)
PART NO. 4309
NOTE: DO NOT RUN THIS PUMP WITHOUT FUEL (EXCEPT FOR BRIEF PERIODS WHILE PRIMING).
IMPORTANT: This regulator must use a fuel return line. The fuel return line runs between the fuel return port of the regulator and the fuel
tank. Fuel pressures cannot be adjusted if the fuel return line is absent.
GENERAL INFORMATION
Mallory’s 3-Port, return style regulator regulates fuel pressure between high pressure fuel pumps and carburetors. The
regulator is recommended for Mallory COMP PUMP® 110, and 140 Series Electric Fuel Pumps.
NOTE: This regulator is not recommended for pumps over 200 gallons per hour.
By returning excess fuel and fuel pressure to the fuel tank, this regulator benefits fuel pumps in several ways. The fuel pump will run
cooler, draw less current and will always have full volume output available at the pressure setting. The fuel return line runs between
the fuel return port of the regulator and the top of the fuel tank. The fuel tank must have
provisions for a fuel return line.
This regulator is equipped with a vacuum/boost compensation port (brass barb fitting) that can be used tomomentarily decrease
fuel pressure (vacuum compensation) at idle and part throttle, or increase fuel pressure under blower boost (boost compensation).
While it is not necessary to connect a hose to the vacuum/boost compensation port, it may be
beneficial in some cases. However, the small plug on the barb must be removed before use.
FORM 1078 (Rev B) 01/12
INSTALLATION INSTRUCTIONS
1 MALLORY IGNITION www.mallory-ignition.com
PART INCLUDED IN THIS KIT
1 3-Port Fuel Pressure Regulator
1 Bracket
2 Bracket Mounting Screws
1 Bypass Spacer (to modify COMP PUMP® 110 and 140 Series
Electric Fuel Pumps)
SPECIFICATIONS:
Port thread sizes (ALL): 3/8” NPT
Adjustment range: 3-12 PSI (approximate)
Fuel Application: Gasoline, Automotive/Street and Racing
applications