Mallory Ignition Mallory 3-PORT COMPETITION FUEL PRESSURE REGULATOR (RETURN STYLE) 4309 - Manual (Page 4)

MAXIMUM OPERA TING
PRESSURE
COMP PUM P ® SERIES
110 14 0
7 PSI 14 PSI
4 MALLORY IGNITION www.mallory-ignition.com
FIGURE 4
FUEL PRESSURE ADJUSTMENT
NOTE: It is not necessary to have the engine running
while setting fuel pressures with this type of regulator.
DO NOT exceed the fuel pump manufacturer’s maximum
recommended operating pressures. This could damage
the fuel pump. (See Figure 4 for Mallory COMP PUMP
® Series Electric Fuel Pumps maximum recommended
operating pressures.)
Step 1
Remove and discard the plastic cap on the vacuum/
boost compensation port. Release the jam nut on the
adjustment screw. Remove the adjustment screw.
Step 2
With the engine off, turn on the fuel pump. Check the
fuel system for fuel leaks. Check the fuel pressure with
the adjustment screw removed. The pressure must be
less than 3 psi. If not, a less restrictive return line must be
used. Turn off the fuel pump and correct any fuel leaks
before proceeding. Install adjustment screw.
Step 3
Adjust fuel pressure. Check the fuel system for fuel
leaks. Turn off the fuel pump and correct any fuel
leaks before proceeding. Install and tighten jam nut.
VACUUM/BOOST COMPENSATION POR
While it is not necessary to connect a hose to the vac-
uum/boost compensation port, it may be beneficial in
some cases. The vacuum/boost compensation port can
be used to momentarily decrease fuel pressure (vacuum
compensation) at idle and part throttle, or increase fuel
pressure under blower boost (boost compensation).
Connect a hose between the vacuum/boost compensa-
tion port and a carburetor or intake manifold vacuum
port to vacuum index the regulator. The set pressure of
the regulator decreases about 1 PSI for every 2 inches
Hg (2 inches on the vacuum gauge). Connect a hose
between the vacuum/boost compensation port and an
intake manifold boost port to boost index the regulator.
The set pressure of the regulator increases 1 PSI for every
1 PSI of boost.
NOTE: DONOT exceed the fuel pump manufacturer’s
maximum recommended operating pressures. This could
damage the fuel pump.
REGULATOR SERVICE PARTS: KI T PART NO.
D IAPHRAGM KIT, G ASOLINE, FO R
REGULATOR PART NO. 4309.
3156
FORM 1078
(Rev B) 01/12
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10601 MEMPHIS AVE. #12, CLEVELAND, OH 44144
216.688.8300
FAX 216.688.8306