INSTALLING THE 4305M REGULATOR
FUEL LINE SIZE (FROM PUMP TO REGULATOR)
1. Connect the fuel line and the return line. The return line Fuel line size is determined by the horsepower of the en-
must be attached to the bottom port on the regulator. The gine.
fuel line must be attached to the upper -8AN port on the Up to 350 HP: 5/16" or 4AN
regulator. Fittings must be purchased to adapt the fuel Up to 500 HP: 3/8" or 6AN
line and the return line to the regulator. The unused port(s) Up to 700 HP: 1/2" or 8AN
in the regulator can be plugged or used as gauge port(s). Up to 1200 HP: 5/8" or 10AN
2. Turn the fuel pump on and check for leaks. If leaks are
RETURN LINE SIZE
found on the NPT (tapered) fittings, make sure the threads The size of the return line is determined by the output of
are covered properly with Teflon sealer.
the fuel pump.
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 reinstall the adjust-
ment screw.
Up to *29 gal/hr (110 liter/hr):
Up to *45 gal/hr (170 liter/hr):
Up to *90 gal/hr (340 liter/hr):
Up to *180 gal/hr (680 liter/hr):
1/4" or 3AN
5/16" or 4AN
3/8" or 6AN
1/2" or 8AN
3. Connect the vacuum hose that was originally connected
* Pump output at 40 psi.
to the stock regulator to the small nipple on the Mallory
PUMP SIZE
regulator. This will reduce fuel pressure at idle and during
Pump size is determined by horsepower.
light-throttle cruise.
Multiply horsepower by .083 to determine pump size in gal-
4. Set the fuel pressure. Loosen the jam nut on the top of
lons per hour.
the regulator and turn the brass adjustment screw to ad-
just the pressure. Clockwise increases pressure.
Example: 500 HP x .083 = *42 gal/hr
Multiply horsepower by .314 to determine pump size in li-
ters per hour.
Example: 500 HP x .314 = *157 liters/hr
*Pump output at 40 psi.
NOTE: Add 25% larger pump for supercharged
applications.
MALLORY IS A DIVISION OF THE MR. GASKET PERFORMANCE GROUP
550 MALLORY WAY, CARSON CITY, NEVADA 89701
(775) 882-6600
FAX (775) 887- 4326
www.mrgasket.com
FORM 1527
(REV. B) 06/01
Made in U.S.A.
Printed in U.S.A.
MALLORY [ MALLORY PERFORMANCE CLUB ]
