Mallory Ignition 4302 User Manual
FORM 1455 (REV. C) 3/00
INSTALLATION INSTRUCTIONS
®
AND TECHNICAL INFORMATION
RETURN LOG
PART NO. 4302
FIGURE 1
FUEL LINE
FROM FUEL PUMP
O-RING – 2 PLACES
FUEL LOG EXTENSION
ININ
1/8 NPT GAUGE PORT – 2 PLACES
(PLUGS SUPPLIED)
DUAL FEED HOLLEY CARB
(VACUUM SECONDARY, DOUBLE PUMPER,
FUEL LINE FROM FUEL PUMP
UP TO 550 HP: AN-8 OR 1/2" HARDLINE
UP TO 800 HP: AN-10 OR 5/8" HARDLINE
UP TO 1200 HP: AN-12 OR 3/4" HARDLINE
RETURN LINE SIZE
UP TO 180 GPH PUMP: AN-8 OR 1/2" HARDLINE
UP TO 360 GPH PUMP: AN-10 OR 5/8" HARDLINE
UP TO 720 GPH PUMP: AN-12 OR 3/4" HARDLINE
OR DOMINATOR)
1. Mallorys fuel return log features a built-in adjustable return
regulator. The pressure can be adjusted while the engine is
running. There are no shims to change and the fittings do
not need to be loosened to adjust the pressure. The pressure is adjusted by loosening the jam nut and turning the
adjustment screw.
2. Fuel pressure is adjustable between about 3 PSI and 12
PSI. Exact range depends on the size of the fuel pump and
return line size.
3. All fittings are included. The center-to-center distance of the
outlets is adjustable to allow use on most Holley carbs.
SEALING GASKET – 2 PLACES
(NOT SUPPLIED)
HOLLEY TO AN-8 COUPLER – 2 PLACES
REGULATOR ASSEMBLY
AN-8 TO 3/8" NPT ADAPTER – 2 PLACES
BACK TO FUEL TANK
AN-10 FITTING – 2 PLACESJAM NUTO-RINGS PRESSURE ADJUSTMENT SCREW
RETURN LINE
6. If AN-8 (or 1/2" hardline) fuel lines are used, the AN-10 fitting(s)
can be replaced with AN-8 fittings (such as Earls PN 985081).
7. Assembly is shown with the inlet at the rear of the carb. Assembly can be flipped over so that the inlet is near the front.
IMPORTANT NOTE
This fuel log is assembled with o-rings for use with gasoline. O-rings are also included for use with alcohol fuel. If
you use alcohol fuel, disassemble the Mallory Return Log
and replace the installed o-rings with those supplied.
4. Thread sealant may be necessary on the 3/8" NPT fittings
and on the 1/8" NPT gauge ports.
5. Repair kits are available and include all necessary O-rings.
These kits can be used for repair, or to convert from gasoline to alcohol or from alcohol to gasoline.
Use Kit #3173 for gasoline applications.
Use Kit #3174 for alcohol applications.
Lubricate O-rings prior to assembly.
--OVER--
FIGURE 2
9. Because Mallorys Return Log is a return-style regulator,
the bypass at the pump must be disabled. If you are using
a pump with an external bypass (such as Mallory 250 or
500 pumps), place a plug in the bypass outlet.
If you are using a Mallory 70, 110, or 140 pump, the bypass spring must be replaced with the bypass spacer included with this Fuel Log (See Figure 2). Replace the spring
with the spacer. Apply thread sealant to the bypass plug
and tighten the plug until snug. Do not overtighten. Replace and tighten the jam nut (See Figure 2).
BYPASS SPRING
(DISCARD)
®
70, 110, OR
140 PUMP
If you are using a non-Mallory pump, contact the manufacturer for information on how to disable the bypass.
BYPASS PLUNGER PAD
BYPASS PLUNGER
BYPASS SPACER
BYPASS PLUG
JAM NUT
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 1455
(REV. C) 3/00
Made in U.S.A.
Printed in U.S.A.
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