Mallory Ignition Mallory COMP PUMP SERIES 70 ELECTRIC FUEL PUMP 4070LP User Manual

Page 2

WIRING PROCEdURE

Wiring the pump to an oil pressure switch will provide power only when

the ignition switch is on and the engine is running. This will prevent the

pump from running if your engine stalls. Use 14 gauge wire or larger

and be sure to disconnect the battery ground cable before wiring the

pump. Refer to Figure 3 when connecting the pump to an oil pressure

switch.
The pump may be wired directly to the ignition switch “ON” terminal

and grounded to the frame or battery. Refer to Figure 4 when connect-

ing the pump to the ignition switch “ON” terminal.

MAINTENANCE–PUMP dISASSEMBLY

If your pump fails to produce adequate pressure, it may require clean-

ing. Follow the steps below to disassemble and clean your Mallory

Electric Fuel Pump. Refer to Figure 5 while performing the following

steps.
Step 1

Remove the pump from the vehicle and clean pump exterior. Place the

pump on its side on a clean work surface. Scribe or draw a line across

the pump housing, port plate and fuel chamber so that you can reas-

semble the pump correctly.
Step 2

Remove the two fuel chamber screws from the bottom of the pump.

Remove the fuel chamber and port plate. NOTE: Do not drop the

Gerotor from the pump cavity.

Step 3

Separate the port plate from the fuel chamber. Inspect the flame arres-

tor screen in the fuel chamber and clean it if necessary.
Step 4

Place your hand beneath the Gerotor and hold the pump in an upright

position. The Gerotor should slide out of the pump housing and into

your hand. NOTE: Observe the position of the Gerotor and be care-

ful not to reverse it when you reassemble the pump.
Step 5

Release the jam nut on the bypass plug. Mark the bypass plug loca-

tion and count the number of turns required to remove it. Remove the

bypass spring and plunger. Inspect the plunger. The plunger surface

should be clean and slide freely in the chamber. Check the plunger

pad and remove any debris embedded in its surface. Reinstall the by-

pass spring and plunger. Clean the bypass plug. Apply thread sealant

compound to the bypass plug threads. Install the bypass plug. Tighten

the jam nut.
Step 6

Clean the Gerotor and install it in the pump housing. Inspect the o-ring

and gasket. Replace them if necessary. Place the gasket and port plate

on the fuel chamber. Install the fuel chamber assembly on the pump

housing. Torque the fuel chamber screws to 24 in/lbs.

RED WIRE (+)

(TOP)

(BOTTOM)

BLACK WIRE (–)

3/8” NPT

OUTLET

3/8” NPT

INLET

BYPASS ADJUSTMENT

(BYPASS PLUG AND

JAM NUT)

FIGURE 1