Fuel Pump; Fuel Pump And System Power Relays; System Power; Tachometer/Ignition - Holley MPI PRO-JECTION Installation Tuning And Troubleshooting Manual

11.8 Fuel Pump

Locate the single GREEN/BLACK wire at the fuel pump relay. Feed this wire down through the engine compartment to the
underside of the vehicle. Route the GREEN/BLACK wire to the fuel pump. Connect the fuel pump pigtail connector to the fuel
pump. Crimp an insulated female spade terminal on the GREEN/BLACK wire and securely fasten to the RED wire (+) of the fuel
pump pigtail connector.
Crimp an insulated male spade terminal on a length of BLACK or GREEN wire and securely fasten it to the GREEN wire of the
fuel pump pigtail connector. Fasten the remaining end to a suitable ground connection under the vehicle using the appropriate
ring terminals. Improper ground connection will result in the failure of the fuel pump to function properly, creating driveability
problems. Securely fasten all wires with the supplied cable ties along the frame rails of the vehicle.
WARNING! Keep all wires away from hot, moving parts or exposure to road debris. Bare or frayed wires can result
in electrical short circuits which can cause system or vehicle damage.

11.9 Fuel Pump and System Power Relays

1 - Two relays are provided in the kit. One relay is for the ECU system power and the other controls the fuel pump. Locate a
suitable position on or near the engine compartment. Make sure that the wiring harness lengths will work with the
location chosen for the relays.
2 - Mark the location of the mounting holes. Drill two holes for mounting the relays.
WARNING! Before drilling, check both sides of the bulkhead for possible interference with electrical systems, etc.
Failure to do so can result in damage to one of the boat systems.
3 - Mount the relays with the remaining 2 short self tapping screws provided, being careful not to over tighten.
4 - Locate the power relay connector and the fuel pump relay connector on the wiring harness. The connectors are
rectangular in shape and identical in appearance. Connect the connector plugs to the relays.

11.10 System Power

Using the assorted connector package and a terminal crimping tool, assemble and connect the wiring as follows:
A - BLACK wire (ground) - Install suitable connector and attach to a good ground. Make sure that the wire is connected
B - RED wire with fuse (12 volt) -
C - RED/WHITE (switched ignition) - Install suitable connector and attach to (+) terminal of coil, or a switched ignition
NOTE: If you use a switched ignition power source, make sure the power source remains energized when the key is in the
crank position.
WARNING! Do not connect to coil positive (+) side if using a capacitive discharge ignition

11.11 Tachometer/Ignition

YELLOW wire (ignition) - For stock ignition systems only, install a suitable terminal to the yellow wire in the harness and
YELLOW/BLACK - For EST(Ford) and TFI (GM) ignition, install a suitable terminal to the yellow wire in the harness and
attach to the (-) side of the ignition coil.
NOTE: If you are using an aftermarket ignition, connect the YELLOW/BLACK wire from the distributor connector to the
ignition system's tach output.
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to ground in an area free of paint, dirt or rust. Poor grounds cause many electrical system
problems.
Install suitable connector and attach to battery. Make sure that 12 volt connections
make good connection and use good quality connectors. Voltage drop due to poor
connection can cause electrical system problems.
volt power source.
attach to the (-) side of the ignition coil.