Holley 12-700 Installation Instructions Manual - page 3
3
Figure 1b (Both carb & fuel injection applications)
WIRING:
WARNING! USE A MINIMUM OF 12 GAUGE WIRE. BE SURE TO CRIMP OR SOLDER ALL CONNECTORS SECURELY AND CLEAN ANY AREA
WHERE GROUND LEADS WILL BE FASTENED. FAILURE TO USE THE MINIMUM WIRE GAUGE COULD RESULT IN A PUMP
MALFUNCTION AND/OR ELECTRICAL FIRE, RESULTING IN PROPERTY DAMAGE, SERIOUS INJURY, AND/OR DEATH.
There are 2 methods to wire the pump: (1) To wire the fuel pump with a relay. (2) To wire the fuel pump with an oil pressure safety switch and relay.
(1) WIRING THE FUEL PUMP WITH A RELAY:
NOTE: You will need Holley Fuel pump relay kit P/N 12-753 or equivalent 4-wire relay.
1. Disconnect the cables from the battery.
2. Mount relay on firewall of engine compartment or other suitable location using a sheet metal screw.
WARNING! Before punching or drilling a hole in the firewall, make sure you know what is on the other side to avoid puncturing equipment
such as heater cores, air-conditioning system equipment, hoses, or wiring.
3. Plug the fuel pump relay harness into the relay, until it locks into place.
4. If using a Holley relay, connect the black wire of the relay harness to a good clean ground using 12 gauge wire.