Mallory Ignition Mallory COMPETITION FUEL PRESSURE REGULATOR FOR FUEL INJECTION 4305M - Manual (Page 2)

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MALLORY IS A TRADEMARK OF PRESTOLITE PERFORMANCE
10601 MEMPHIS AVE. #12, CLEVELAND, OH 44144
216.688.8300 FAX 216.688.8306
FORM 1527
(REV. D) 01/12
Made in U.S.A.
Printed in U.S.A.
INSTALLING THE 4305M REGULATOR
1. Connect the fuel line and the return line.
The return line must be attached to the bottom
port on the regulator. The fuel line must be attached
to the upper -8AN port on the regulator. Fittings must
be purchased to adapt the fuel line and the return line
to the regulator. The unused port(s) in the regulator
can be plugged or used
as gauge port(s).
2. Turn the fuel pump on and check for leaks. If
leaks are found on the NPT (tapered) fittings,
make sure the threads are covered properly with
thread sealer.
NOTE: If the fuel system will not prime
properly, back the adjustment screw all the way out
of the regulator until the system is primed. Then rein-
stall the adjustment screw.
3. Connect the vacuum hose that was originally
connected to the stock regulator to the small
nipple on the Mallory regulator. This will reduce fuel
pressure at idle and during light-throttle cruise.
4. Set the fuel pressure. Loosen the jam nut on the top of
the regulator and turn the brass adjustment screw to
adjust the pressure. Clockwise increases pressure.
FUEL LINE SIZE (FROM PUMP TO REGULATOR)
Fuel line size is determined by the horsepower of
the engine.
Up to 350 HP:
5/16” or –4AN
Up to 500 HP: 3/8” or –6AN
Up to 700 HP: 1/2” or –8AN
Up to 1200 HP: 5/8” or –10AN
RETURN LINE SIZE
The size of the return line is determined by the
output of the fuel pump.
Up to *29 gal/hr (110 liter/hr):
5/16” or –4AN
Up to *45 gal/hr (170 liter/hr): 3/8” or –6AN
Up to *90 gal/hr (340 liter/hr): 1/2” or –8AN
Up to *180 gal/hr (680 liter/hr): 5/8” or –10AN
*Pump output at 40 psi.
PUMP SIZE
Pump size is determined by horsepower.
Multiply horsepower by .083 to determine pump size in
gallons per hour.
Example: 500 HP x .083 = *42 gal/hr
Multiply horsepower by .314 to determine pump size in
liters per hour.
Example: 500 HP x .314 = *157 liters/hr
*Pump output at 40 psi.
NOTE: Add 25% larger pump for supercharged applica-
tions.