INSTALLING THE 4307M 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 Teflon 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 reinstall the adjust-

ment screw.

3. Set the fuel pressure. Loosen the jam nut on the top of

the regulator and turn the brass adjustment screw to ad-

just the pressure. Clockwise increases pressure.

FUEL LINE SIZE (FROM PUMP TO REGULATOR)

Minimum 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

RETURN LINE SIZE

The minimum return line size is determined by the output

of the fuel pump.

Up to 29 gal/hr (110 liter/hr):

1/4" or –3AN

Up to 45 gal/hr (170 liter/hr):

5/16" or –4AN

Up to 90 gal/hr (340 liter/hr):

3/8" or –6AN

Up to 200 gal/hr (680 liter/hr):

1/2" or –8AN

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 #1529

(REV. A) 06/01

Made in U.S.A.

Printed in U.S.A.