Holley 12-804 Fuel Pressure Regulator Installation ...

1 ELECTRIC FUEL PUMPS P/N 12-801-1, 712-801-1, 12-802-1, 712-802-1, 12-815-1, & 712-815-1 FUEL Pressure REGULATORS P/N 12-803, 12-501, 12-804 , 12-500, & 15812 NOSI nstallation InstructionsWARNING! THESE INSTRUCTIONS MUST BE READ AND FULLY UNDERSTOOD BEFORE BEGINNING THEINSTALLATION. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN POOR PERFORMANCE,VEHICLE DAMAGE, PERSONAL INJURY, OR DEATH. IF THESE INSTRUCTIONS ARE NOT FULLYUNDERSTOOD, Installation SHOULD NOT BE ATTEMPTED. APPLICATIONS:P/NDESCRIPTIONFLOWSPRESSURE REGULATORALCOHOL /METHANOLCOMPATIBLEPRESETPRESSURESAFETYS WITCHSHUT-OFF12-801-1 Red ElectricFuel pump,Street gph (free flow)67 gph at 5 psiNot required formostapplicationsNo7 PSIR ecommended(P/N 12-810)712-801-1 Red ElectricFuel Pump,Marine97 gph (free flow)67 gph at 5 psiNot required formostapplicationsNo7 PSIR ecommended(P/N 12-810)12-802-1 Blue ElectricFuel Pump,Competition 110 gph (free flow)70 gph at 9 psiHigh Pressure (12-803provided)No14 PSIR ecommended(P/N 12-810)712-802-1 Blue ElectricFuel Pump,CompetitionMarine110 gph (free flow)70 gph at 9 psiHigh Pressure (12-803provided)No14 PSIR ecommended(P/N 12-810)12-815-1 Black ElectricFuel pump, ProSeries140 gph (freeflow)gph at 9 psiRequires P/N 12-704 Yes14 PSIR ecommended(P/N 12-810)712-815-1 Black ElectricFuel pump, ProSeries Marine140 gph (free flow)

2 120 gph at 9 psiRequires P/N 12-704 Yes14 PSIR ecommended(P/N 12-810)P/NDESCRIPTIONPRESSURERANGEINLET/ OUTLETSIZERESTRICTION12-80312-501 High- Pressure Fuel Regulator (std. finish)High- Pressure Fuel Regulator (chrome finish)4-1/2 to 9 PSI3/8 NPT (7/32 )15812 NOSHigh- Pressure Fuel Regulator (std. finish)4-1/2 to 9 PSI3/8 NPT (7/32 )12-80412-500 Low- Pressure Fuel Regulator (std. finish) Low- Pressure Fuel Regulator (chrome finish)1 to 4 PSI3/8 NPT (7/32 )INTRODUCTION:Congratulations on your purchase of the Holley Fuel Pump, Holley Regulator , or NOS Regulator ! Holley Performance Productscannot and will not be responsible for any alleged or actual engine or other damage, or other conditions resulting frommisapplication of the fuel pumps, fuel Pressure regulators, or the oil Pressure safety switch described herein. However, it is ourintent to provide the best possible products for our customer; products that perform properly and satisfy your you need information or parts assistance, please contact our Technical Service Department at 1-866-GOHOLLEY or 1-270-781-9741, Monday through Friday, 7 to 5 Central Time.

3 Please have the part number on hand of the productwhen you electric fuel pump in this instruction sheet is of the vane rotor type. Holley makes three versions: a low- Pressure pumpmeets the flow requirements of most passenger vehicles. The high- Pressure pump is used mainly for high performanceapplications and comes with a fuel Pressure Regulator . The second high- Pressure pump allows an even higher flow rate and isalcohol and methanol compatible, but contains no fuel Pressure Regulator . A separate fuel Pressure Regulator must bepurchased. The mounting holes are untapped on the above Holley and NOS regulators. Use the supplied self-tapping MOUNTING AND Installation :The best location for mounting any electric fuel pump is the rear of the vehicle. The inlet and outlet of the pump must bemounted below the lowest point of the tank. This is necessary to allow for an adequate fuel supply.

4 The pump is designed topush fuel and not designed to suck fuel out of the tank. It needs to be gravity-fed or if it s pulling from the top of the tank, itneeds to develop a siphon feed to the pump. The pump should be mounted on the chassis, in a vertical position with the pumpmotor on top. Avoid exposure of the pump and fuel lines to moving parts and to any hot areas, such as the exhaust pump should not be mounted in a closed area, such as the vehicle s trunk. Follow the steps below for mounting the ! THE PUMP MUST BE LOCATED SO THAT INTERFERENCE BETWEEN THE VEHICLE S BODY AND ITSCHASSIS MOVEMENT IS AVOIDED. THE PUMP AND ITS CONNECTING HOSES MUST NOT BE SUBJECTEDTO LOW GROUND CLEARANCE, WHERE ANY FLYING ROCKS OR ROAD DEBRIS CAN CAUSE TO AVOID THESE HAZARDS WILL LEAD TO PUMP DAMAGE, WHICH COULD RESULT IN FIRE,PROPERTY DAMAGE, SERIOUS INJURY, AND/OR Select a mounting site as close as possible to the fuel supply and away from possible sources of heat, as Use the mounting bracket (supplied) as a template and drill two clearance holes for 5/16 Place the rubber gaskets (supplied) between the mounting bracket and motor housing and mount the pump in the verticalposition (motor on top) using two 5/16 Connect the fuel line from the tank to the fuel filter and the filter to the inlet port of the pump.

5 Connect the carburetordelivery line to the outlet port of the pump. Use the same size flexible hose as original equipment. Avoid unnecessaryrestrictions such as sharp bends and undersized fuel fittings and hoses. Avoid routing fuel lines in areas that would causechafing. All fuel line connections must be ! DO NOT OVERTIGHTEN THE FITTINGS ON THE FUEL PUMP. OVERTIGHTENING OF THE FITTINGS CANCAUSE THE PUMP BASE TO CRACK, ALLOWING FUEL TO LEAK. A FUEL LEAK CAN CAUSE A FIREAND/OR EXPLOSION RESULTING IN PROPERTY DAMAGE, SERIOUS INJURY, AND/OR DEATH. NOTE: For performance vehicles, 3/8 hose is recommended. Two filters mounted in parallel should be used. See Performance Filter SystemFigure 15. If the Mechanical Fuel Pump is not going to be used or removed, disconnect the fuel lines from the pump and securely plugthe inlet and discharge ports with plugs to deactivate the pump.

6 Connect the original suction line to the outlet line,bypassing the pump from the If the Mechanical Fuel Pump is removed, seal the opening with a suitable metal cover and A FUEL Pressure Regulator WITH A FUEL PUMP:NOTE: If the pump is a high- Pressure model, a Pressure Regulator must be installed in the line between the pump and : The mounting holes are untapped on these regulators. Use the supplied self-tapping Using the bracket supplied with the Regulator , position the Regulator as close to the carburetor as possible, taking care tominimize the exposure to heat sources. DO NOT mount the Regulator on the exhaust manifold or any extremely hot The Regulator provided with the 12-802-1 pump has two discharge (out) ports. In dual carburetor installations, one port canfeed each carburetor. With single carbs, plug one port and feed the carburetor from the other.

7 Either may be should determine Connect the fuel line from the out side of the pump to the in side on the Regulator . All fuel line connections must Connect the out side of the Regulator to the fuel inlet on the carburetor(s). All fuel line connections must be The Regulator comes from Holley with the Regulator Pressure preset (see table). However, for individual requirements, itmay be readjusted. Loosening the Regulator locknut and turning the adjustment screw clockwise increases the Pressure by turning the adjustment screw ! TURNING THE ADJUSTMENT SCREW ALL THE WAY IN WILL RESULT IN EXCESSIVE FUEL PRESSUREAND CAUSE THE CARBURETOR TO FLOOD. A FLOODED CARBURETOR CAN CAUSE A FIRE AND/OREXPLOSION RESULTING IN PROPERTY DAMAGE, SERIOUS INJURY, AND/OR DEATH. ALWAYS USE AFUEL Pressure GAUGE BETWEEN THE Regulator AND THE CARBURETOR(S) WHEN ADJUSTINGTHE FUEL Pressure Regulator .

8 NOTE: Any change made in fuel Pressure will change the fuel bowl float level requirements. A readjustment in fuel bowl levelswill be required for proper operation of the fuel THE FUEL PUMP: NOTE: A fuel pump can be wired as shown in figure 2, but the preferred method is wiring it through a relay, as shown in Disconnect the ground cable from the Connect the fuel pump (red lead) to a 12-volt ignition source. In this line, add an in-line fuse holder and a amp To complete the Installation , connect the ground (black lead) to the 2 WIRING THE FUEL PUMP WITH A RELAY:NOTE: You will need Holley Fuel pump relay kit P/N 12-753 or equivalent 4-wire Disconnect the cables from the Mount relay on firewall of engine compartment using a sheet metal ! Before punching or drilling a hole in the firewall, make sure you know what is on the other side to avoidpuncturing equipment such as heater cores, air-conditioning system equipment, hoses, or Plug the fuel pump relay harness into the relay, until it locks into Connect the black wire of the harness to Connect the Green/Black wire to a switched 12V Connect one of the red wires to the positive wire (red wire) of the fuel Attach the in-line fuse holder to the remaining red wire.

9 After attaching the fuse holder, insert the 15A fuse and connect tothe positive side of the Reconnect the battery 3 WIRING THE FUEL PUMP WITH A OIL Pressure SAFETY SWITCH: One method is to wire the pump to a switched 12-volt source (providing power only when the engine is running) located at thevehicle s electric panel. To ensure this condition, the Installation of a Holley 12-810 oil Pressure safety switch is recommendedfor Installation into the wiring circuit. This will ensure that the pump will not continue to operate after the engine is shut off and/orwhen the key is left in the ON position. If the Pressure switch is to be used, follow the Installation instructions as outlined below(refer to Figure 4).Figure 41. Disconnect the ground cable from the Remove the original equipment oil Pressure switch and Screw a 1/8 pipe nipple into the hole from which the original Pressure switch was removed.

10 Use any suitable threadsealant on all fittings, taking care to avoid any excess that might contaminate the Screw a 1/8 pipe tee onto the nipple and position it in a manner to facilitate the Installation of the original oil Pressure switchand the new oil Pressure safety switch in the remaining two holes. 5. Screw in the two switches and reconnect the lead to the original equipment oil Pressure : The pump oil Pressure switch will normally have three terminals marked: C (common), NC (normally closed), and NO(normally open).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 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 To complete the Installation , connect the ground cable to the !