Edelbrock Quiet-Flo 1792, Quiet-Flo 1791 User Manual

Brochure #63-0169

Catalog #s 1791, 1792 Rev. 1/08 - AJ/mc Page 1 of 2

EDELBROCK QUIET-FLO™ ELECTRIC FUEL PUMPS

Catalog #1791 & #1792

INSTALLATION INSTRUCTIONS

PLEASE study these instructions carefully before beginning this installation. Most installations can be accomplished with common tools and

procedures. However, you should be familiar with and comfortable working on your vehicle. If you do not feel comfortable performing this installation, it is recommended to have the installation completed by a qualified mechanic. If you have any questions, please call our Technical Hotline at: 1-800-416-8628, 7:00 am - 5:00 pm, Pacific Standard Time, Monday through Friday or e-mail us at edelbrock@edelbrock.com

CAUTION: Installation of this product should be performed by persons knowledgeable in the repair and modification of automotive fuel systems. Do not loosen fuel system connections until relieving fuel pressure as recommended in your automotive service manual. Fuel leakage will occur

when loosening fuel system connections, eliminate potential fire hazards before loosening any fuel system connections.

DESCRIPTION: Manufactured by Essex Industries, one of the most renowned fuel system manufacturers, Quiet-Flo™ Electric Fuel Pumps feature anodized aluminum housings and high quality internals resulting in quiet operation and long life. They are designed for use in universal carbureted applications such as street rods and muscle cars. Both pumps feature replaceable screen type inlet filters

(NOTE: Use of an in-line fuel filter in

your fuel system is also recommended)

. Mounting bracket and hardware are included.

• 1791: Features a 3/8” NPT inlet and 3/8” NPT outlet. 1791 has a free flow rate of 120 gallons per hour, flows 48 gallons per hour at 5.0 psi, and will support up to 600 horsepower. Fuel pressure is externally adjustable from 5 to 10 psi and is factory preset to

6.5 psi. A fuel pressure regulator is not required when using the factory preset 6.5 psi fuel pressure.

• 1792: Features a 1/2” NPT inlet and 1/2” NPT outlet. 1792 has a free flow rate of 160 gallons per hour, flows 80 gallons per hour at 6.5 psi, and will support up to 1000 horsepower. Fuel pressure is factory preset to 12 psi. An external fuel pressure regulator such as Edelbrock #1727 is required.

INSTALLATION

NOTE: Refer to the photos below throughout the installation. Continued instructions are on the next page.

Figure 2 - Fuel Pump

Use Mounting Bracket Holes

as A Guide for Drilling

Mounting Bracket

Clamp Bolt

Rubber

Insulator

Inlet 1791 = 3/8” NPT 1792 = 1/2” NPT

Outlet 1791 = 3/8” NPT 1792 = 1/2” NPT

Black (Ground)

Red

(12V From Relay)

Figure 1 - Fuel Pump Mounting Bracket

Brochure #63-0169

Catalog #s 1791, 1792 Rev. 1/08 - AJ/mc Page 2 of 2

Edelbrock Corporation • 2700 California St. • Torrance, CA 90503

Tech-Line: 800-416-8628 • E-Mail: Edelbrock@Edelbrock.com

INSTALLATION

1. With the ignition off and engine cool, relieve the fuel system pressure.

2. Remove the fuel line, carburetor side and fuel tank side side of fuel pump.

3. Determine the new fuel pump mounting location.

NOTE: These pumps are only designed to push fuel from the rear of the vehicle forward, towards the engine bay. The pump must be mounted below the fuel level or pickup tube inlet for the pump to prime properly on startup. Ideal installation would mount the pump upright as shown in Figure 2, but the pump will operate in any orientation.

4. Replace existing fuel lines as necessary for proper fitment. Mark and drill mounting bracket holes using the bracket as a template (See

Figure 1).

5. Assemble the bracket and fuel pump.

6. Install the fuel pump and bracket assembly in the desired location.

7. Install the appropriate fittings or use appropriate sized hose ends on your fuel line

(Fuel fittings not included) (See Figure 2)

. Coat the threads of the fittings with thread sealer before assembly. Pump #1791 features 3/8” NPT inlet and outlet and 1792 features 1/2” NPT threads. See the Russell catalog or visit www.russellperformance.com

for a selection of fittings and hose ends.

8. FUEL PUMP WIRING:

NOTE: Use of a 30 AMP relay is required. Edelbrock Universal Fuel Pump Relay #1795 is recommended.

Connect the BLACK wire to a battery ground or good engine/chassis ground, and the RED wire to the 12v output from the relay being used

(See Figure 2)

. The relay should be wired such that power to the fuel pump is only on when the key is on. See

the installation instructions to Universal Fuel Pump Relay #1795 for relay wiring instructions.

9. Connect and tighten fuel lines to the inlet and outlet. Then tighten mounting bracket clamp bolt

(See Figure 1)

10. Check for leaks: Turn fuel pump on and check all connections for leaks. If leaks exist, immediately turn key off and repair before continuing.

ADJUSTMENT

NOTE: Fuel pumps are preset to 6.5 psi (#1791) and 12 psi (#1792), which should be adequate in most situations. However, if you would like to

adjust the fuel pump pressure, follow steps listed below:

1. Adjusting fuel pressure will require having a fuel pressure gauge installed between the fuel pump and carburetor. It is recommended to have a fuel pressure gauge installed in the fuel system to allow you to monitor your fuel pressure at all times. If you already have a pressure gauge installed, you may skip to step 4. If you do not have a gauge installed, make sure fuel pump is off, and pressure in the fuel line has been relieved before continuing.

2. Connect a fuel pressure gauge between the fuel pump and your carburetor.

3. Turn fuel pump on, however DO NOT start the engine. Make sure there are no leaks before continuing.

4. Start the engine and take a reading of the running fuel pressure. Locate the Adjustment screw

(See Fig. 3)

and adjust pressure to the desired level. Rotate the screw clockwise to increase fuel pressure or counter-clockwise to decrease fuel pressure.

5. If a pressure gauge was temporarily installed, turn off the pump and relieve the fuel pressure in the line. Remove the gauge and reconnect your fuel lines. Turn pump on and check for leaks before starting the engine.

Adjustment Screw

Figure 3 - Fuel Pressure Adjustment