Electrical Planning Notes:
Reference Sheet 3 and 4 for schematic wiring diagram examples. Use electrical components as described including
electrical connectors that are appropriate for the operating environment of the fuel system, whether its use in street,
racing, or marine applications. Electrical connectors for the power leads must be capable of high current draw, note all
connections, wire, and component rating requirements herein. Solder and use shrink wrap for wire splices for extra
reliability (unless high quality crimping is performed). Use of a check valve in fuel system as shown in plumbing
diagram will maintain fuel pressure at normal levels during engine starting and may be required depending on the
wiring of main relay control circuit. (OEM and some aftermarket ECMs have fuel pump relay control outputs that will
turn off fuel pump during engine starting, requiring check valve use.) If the fuel pressure does not maintain during
engine starting, ensure fuel pump is energized while starting. Main wiring schematic diagram below shows the control
of relay by ignition switch. This source can be changed as described, or by a toggle switch. Some forms of racing
have specific rules regarding electrical switching of fuel pump. Consult appropriate racing guidelines, rules, and
regulations.
MAIN WIRING SCHEMATIC DIAGRAM:
(Some electrical components shown are not supplied with kit)
POWER RELAY
operating with low engine
Example 1: Continuous Maximum Speed
Speed”. Use Example 1 for racing
specific applications, or short
interval use. Use in continuous
SPEED CONTROL SCHEMATIC DIAGRAMS:
Attach no wiring to speed control terminal, to operate
Pump Certification as “Maximum
curve was recorded as shown on the
-
demand for extended periods.
pump at continuous maximum speed. The performance
Attach switch and wiring as shown to the right, to operate pump at
desired switch action, refer to Example 4. Switch type can be a relay or
switching based on pressure or other means. Current draw through this
circuit is extremely low (much less than 1 amp), so a very low current rating
CIRCUIT
FUEL PUMP
build-up.
Example 3: Switch to Ground Speed Changing
(8-10ga)
(8-10ga)
VEHICLE ELECTRICAL SYSTEM
periods of low engine fuel demand conditions to avoid fuel system heat
(12-24 Volt System)
VEHICLE BATTERY
properly wire this example. Reduced speed is recommended during long
or ECM
SWITCH
IGNITION
(1-5A)
CIRCUIT
FUSED
for this switch can be used. Use the diagram to the right as a guide to
(50A)
or FUSE
BREAKER
(50+A Rating)
(8-10ga)
(16-20ga)
C
NC
NO
+
(on), the pump will operate in reduced speed mode. To reverse the
continuous maximum speed while switch is in the open position
Example 2: Continuous Reduced Speed
(position as shown in diagram). When the switch is in the closed position
maximum speed may cause over-
heating and therefore may
damage fuel pump. Additional
cooling may be required using
maximum speed only while
Attach a jumper wire as shown below, to operate
pump at continuous reduced speed. The reduced
speed is preset, with the performance curve
shown on the pump certification.
See schematic, attach wire between
negative terminal (Black Lug) and
Yellow Lug. Use Example 2 if the
flow rate at reduced speed is
adequate for application. Using
this mode of operation is
considered continuous duty.
See Examples 3 and 4 for
switching between maximum
and reduced speed.
110021026-1, Rev A Sheet 3 of 6
The speed control terminal (Yellow Center Lug) can have voltage or a signal applied to it. When the speed control
terminal has less than 0.25V (Approx) applied to it, the mode of operation is in continuous reduced speed. When the
speed control terminal has greater than 1.65V (Approx), the mode of operation is in continuous maximum speed. A
pulsed signal may also be used to control pump speed. See examples below for a method suitable for your application.
JUMPER WIRE
PUMP OPERATES
AT MAXIMUM SPEED
WITH SWITCH POSITION
SHOWN (OPEN).
(16-20ga) Device or Circuit can be used as shown below,
for proper operation. See Speed Control Schematic Diagrams
for wiring of speed control (Yellow Terminal).
Fuelab Model:
40501
FUEL PUMP
NO JUMPER WIRE
OR DEVICE
