MALLORY COMP PUMP® 110 AND 140
SERIES ELECTRIC FUEL PUMP SUGGESTED
MODIFICATION ONLY WHEN USING RETURN
STYLE REGULATORS(See Figure 1)
Step 1
Release the jam nut on the bypass plug. Remove the
bypass plug. Remove the bypass spring and plunger.
Save the bypass spring for possible future use.
Step 2
Inspect the bypass plunger. The bypass plunger sur-
face should be clean and slide freely in the chamber.
Check the bypass plunger pad and remove any
debris embedded in its surface.
Step 3
Install the bypass plunger pad in the bypass plunger.
Install the bypass plunger and bypass spacer. Clean
the bypass plug.
Step 4
Apply thread sealant compound on the bypass plug.
You can find thread sealant compound at a hardware
store. Do not use Teflon tape.
Step 5
Install the bypass plug. Gently tighten bypass plug
until you feel it lock (torque to 5 in/lbs). Install and
tighten the jam nut.
FIGURE 1
MOUNTING PROCEDURE
The regulator may be mounted at any angle. For
maximum efficiency, mount the regulator as close as
possible to the carburetors.
DO NOT mount the regulator on or near exhaust manifolds. A
bracket is provided for convenient mounting under an intake
bolt.
FITTINGS, FUEL LINES AND FUEL RETURN
LINE
The fuel return line should be as large, or larger, as
the fuel line between the fuel pump and the regulator.
See Figure 3.
Purchase fittings (and plugs). Use a thread sealant
compound on the fitting threads. You can find thread
sealant compound at a hardware store. Do not use
Teflon tape. Install the fittings. Do not overtighten the
fittings. This could damage the regulator. Connect the
fuel lines and fuel return line. See Figure 3A-3C.
FIGURE 2
Fuel Return Line
Length/ Distance
FUEL RETURN LINE
SIZE
RECOMMENDATIONS
FUEL PUMP
GALLONS
PER HOUR (FREE FLOW)
130 TO 199
5/8”
5/8”
1/2”
5/8” = #10AN
1 TO 99
100 TO 129
16 – 20’
1/2î
1/2
”
11 – 15’
3/8”
1/2”
6 – 10’
3/8”
1/2”
1 – 5’
3/8” = #6AN
1/2” = #8AN
2
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