Holley 12-125 Automobile Parts User Manual


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Figure 3
6. Connect the fuel pump (red lead) to the terminal marked “C”. In this line, add an in-line fuse holder and a 15-amp fuse.
7. Connect the terminal marked “NO” to the on terminal of the ignition switch.
8. Connect the terminal marked “NC” to the starter terminal that’s hot (12V) during cranking only.
9. To complete the installation, connect the ground cable to the battery.
WARNING!
USE A MINIMUM OF 12/14 GAUGE WIRE. BE SURE TO CRIMP 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.
MAINTENANCE AND CLEANING INSTRUCTIONS FOR HP PUMPS:
Due to the current poor quality gasoline that’s available, it is recommended that periodically a can of dry gas (such as STP water remover) be
used to absorb the water out of the fuel delivery system. The fuel filter element should be blown clean with compressed air every 6,000 miles
and replaced every 12,000 miles to assure maximum protections. If your fuel pump fails to pump or fails to maintain adequate pressure, check
the following:
1. Check the voltage at the pump to assure a 12 volt supply.
2. Check the fuel line (especially the fuel filter) for any obstruction. Use compressed air to blow the line free.
3. If this doesn’t solve the problem, turn the pump on and listen for a hum from the top of the pump. If there is no hum, the pump electrical
system should be checked by a competent repairman. If the pump hums, it probably only needs to be cleaned. See Figure 4.
CLEANING THE PUMP:
The following is a step-by-step procedure for cleaning the Holley electric fuel pumps. Do all disassembling on a clean bench. Read all
instructions thoroughly and completely before starting.
1. Remove the pump from the car.
2. Remove the inlet and outlet line fittings from the pump housing assembly.
3. Remove the filter screen from the inlet port and clean thoroughly with a spray-type carburetor cleaner.
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