Mallory Ignition Mallory COMPETITION FUEL PRESSURE REGULATOR FOR FUEL INJECTION 4305M - Manual

COMPETITION
FUEL PRESSURE REGULATOR
FOR FUEL INJECTION
PART NO. 4305M
IMPORTANT: This regulator must use a fuel return line. The fuel return line runs between the
fuel by pass port of the regulator and the fuel tank. Fuel pressures cannot be adjusted if the
fuel return line is absent.
INSTALLATION INSTRUCTIONS
FORM 1527 (REV. D) 01/12
PARTS INCLUDED IN THIS KIT
1 Fuel Pressure Regulator
1 Bracket
2 Bracket Mounting Screws
2 3/8” NPT Pipe Plugs
2 AN-8 Fittings
2 O-rings for Fittings
SPECIFICATIONS:
Port thread sizes: 3/8” NPT and AN-8
Adjustment range: 30-100 PSI
Fuel Application: Gasoline and Alcohol/Methanol
GENERAL INFORMATION
Mallory’s 4305M regulator regulates fuel pressure
between high pressure fuel pumps and fuel injection sys-
tems. The regulator is recommended for Mallory COMP
PUMP® 60FI, 110FI, or any fuel injection pump designed
to produce 30-100 PSI.
The 4305M regulator is a return style fuel pressure regu-
lator. The excess fuel and fuel pressure is sent back to the
fuel tank through the fuel return line. The fuel return line
runs between the fuel bypass port of the regulator and
the top of the fuel tank. The fuel tank must have provi-
sions for a fuel return line.
This regulator is equipped with a vacuum/boost
compensation port (brass barb fitting) that can be
used to momentarily decrease fuel pressure (vacuum
compensation) at idle and part throttle, or increase
fuel pressure under blower boost (boost compensa-
tion). While it is not necessary to connect a hose to
the vacuum/boost compensation port, it may be ben-
eficial in some cases. However, the small plug
on the barb must be removed before use.
You can mount the 4305M regulator at any angle.
For maximum efficiency, mount it as close as
possible to the fuel injection system. DO NOT
mount the regulator on or near exhaust manifolds.
A bracket is provided for convenient mounting.
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ADJUSTMENT SCREW
JAM NUT
REGULATOR CAP
REGULATOR HOUSING
INLET PORT FROM PUMP (AN-8)
BRACKET MOUNTING HOLES (2)
FUEL BYPASS PORT (AN-8)
VACUUM/BOOST
COMPENSATION PORT (3/16"
O.D. BRASS BARB FITTING)
OUTLETS TO INJECTION
(3 PLACES, 3/8" NPT)
UNUSED PORTS MAY BE
PLUGGED OR USED AS
GAUGE PORTS