Holley 12-700 Installation Instructions Manual
HP FUEL PUMPS
P/N 12-700 & 12-890
Installation Instructions 199R10569
WARNING! THESE INSTRUCTIONS MUST BE READ AND FULLY UNDERSTOOD BEFORE BEGINNING INSTALLATION. FAILURE TO
FOLLOW THESE INSTRUCTIONS MAY RESULT IN POOR PERFORMANCE, VEHICLE DAMAGE, PERSONAL INJURY, OR DEATH.
IF THESE INSTRUCTIONS ARE NOT FULLY UNDERSTOOD, INSTALLATION SHOULD NOT BE ATTEMPTED. PLEASE CONSULT
HOLLEY TECH SERVICE OR A QUALIFIED MECHANIC.
NOTE: NOT FOR USE WITH METHANOL! Will work with E-85!
APPLICATIONS:
Naturally
Aspirated
Forced
Induction Inlet Outlet Inlet Outlet Return
Pre
Post
Pre
Post
Carb
EFI
12-700
75 @ 8PSI
57 @ 43PSI
47 @ 60 PSI
Street/Strip Gasoline / Diesel
Yes
900
700
550
690
530
430
-8AN -8AN -6 AN -6AN
-6AN 162-564 162-555 162-564 162-554 12-845 12-846 13 Amps
12-890
96 @ 8PSI
76 @ 43PSI
70 @ 60 PSI
Street/Race Gasoline / Diesel
Yes
1050
900
800
800
700
600
-8AN -8AN -8AN -6AN
-6AN 162-564 162-555 162-564 162-554 12-845 12-846 18 Amps
The pumps below do not have an internal bypass. A bypass style regulator and return line are required.
Max Amp
Draw
Part
Number
Holley Recommendations for Peak Performance
Pump Fitting
Size
Recommended
Regulator
Fuel Filter
(Carbureted)
Fuel Filter
(Fuel injected)
Max HP*
GPH Flow at Rated
PSI and 13.5V
Application Fuel Compatibility
Minimum
Recommended Line
Compatible up
to 18.5V
PARTS REQUIRED FOR INSTALLATION:
Pre-Filter
Post-Filter
Relay Kit (30amp minimum) – Holley P/N 12-753 or equivalent
Safety Shutoff Switch (Holley P/N 12-810 or equivalent)
Fuel hose & fittings
Wire & connectors
Mounting hardware
NOTE: These pumps are not serviceable in the field. Contact Holley tech service for fuel pump service.
INTRODUCTION:
Congratulations on your purchase of the
Holley HP Fuel Pump. This instruction sheet contains all the information needed to install this fuel pump.
Please read all the
WARNINGS and NOTES. They contain valuable information that can save you time and money. Holley Performance Products
cannot and will not be responsible for any alleged or actual engine or other damage, or other conditions resulting from misapplication of the fuel pumps
and fuel pressure regulators described herein. However, it is our intent to provide the best possible products for our customer; products that perform
properly and satisfy your expectations. Should you need information or parts assistance, please contact Technical Service at 1-270-781-9741, M-F, 8
a.m. to 6 p.m. & Sat. 9 a.m. to 3 p.m. CST. Please have the P/N ready when calling.
NOTE: A screen type pre-filter (100 micron), a top quality post fuel filter, fuel hose and clamps, 12 gauge wire, fuel fittings, assorted terminals, a relay
kit (12-753), and an optional safety shut-off switch (12-810) is required to complete the installation of the Holley HP fuel pump. These parts
are not included with the fuel pump.
NOTE: These Holley HP fuel pumps require the use of a bypass style fuel pressure regulator (Part number 12-845 for carbureted applications and 12-
846 for EFI applications).
NOTE: The Holley HP fuel pump utilizes o-ring sealed inlet/outlet ports. The ports utilize ¾-16 O-ring (-8AN) threads. These ports are not pipe
thread, therefore
Do not use thread sealant.
NOTE: Holley ALWAYS RECOMMENDS using our oil pressure safety shut-off switch, part number 12-810.
PUMP MOUNTING AND INSTALLATION:
The best location for mounting any electric fuel pump is the rear of the vehicle, near the fuel tank and in a position even with or below the bottom of the
tank, allowing the fuel to be gravity fed to the pump. The pump should be mounted on a solid member, such as the chassis, with the pump
outlet pointing forward or upward.
Avoid exposure of the pump and fuel lines to moving parts and to any hot areas, such as the exhaust manifold.
The pump should not be mounted in an enclosed area, such as the vehicle’s trunk. Follow the steps below for mounting the pump.