maximum pressure is 14 psi. Includes P/N 12-803 fuel pressure regulator. Provides constant fuel flow with no pulsation.

Its not needed for a Holley red pump, You shouldnt even need a regulator for that pump. However with any electric fuel pump a regulator with a return line will keep the fuel cooler and put less stress on the pump.

The red pump free flows 97 gallons per hour (GPH) while drawing only 2 amps and is capable of supplying a maximum of 7 PSI. Blue pumps can provide 110 GPH free flow at only 3 amps and maintain 14 psi.

The “blue” pump, P/N12-802-1, is rated at 110 GPH and it is designed for street/strip applications. Pressure is pre-set at 14 PSI and a regulator is included as part of the package. Fuel pressure is pre-set at 15 PSI and both a pressure regulator and 3/8″ return line to the tank are required.

if your just running a regular mechanical pump or a electric pump around 7 psi. then no need for a return line. return lines are for fuel injection where the pump is always running at full steam. just cap it off, you’ll be fine.

425 hp
They are rotor/vane-style pumps designed to flow high volumes of fuel at low pressures, perfect for low- to high-horsepower carbureted applications. The Holley Red pump flows 97 gph and supports 425 hp, while the Blue pump flows 110 gph and supports 550 hp.

Holley pumps are notoriously noisy! I ran a Carter electric and you could hear it, but it WAS in the trunk of a Fleetline with no backseat! It wasn’t unpleasantly loud and it worked GREAT. Much quieter than Holley electrics I’ve run in the past (and more reliable too!).

Too high of pressure may result in, over fueling of the engine. As a result, this can lead to a rough running engine; poor fuel mileage, and black smoke coming from the exhaust. If your regulator is going bad, your car could display several different symptoms.

The HP™ fuel pumps feature OEM gerotor technology which yields lightweight, quiet operation and 100,000+ mile durability in a cost effective, attractive package. The 12-600 features improved hot fuel handling capabilities and was designed to greatly reduce the negative effects of heated fuel now common with many of today’s pump gas blends.

It pushes fuel up an elevation roughly 18 inches and through roughly 8 feet of fuel line. It easily provides enough fuel and pressure for the Holley 390 sitting on my 2.8 Liter Inline 6. It is not quiet as stated in the advertised description.

HP fuel pumps work well on the street or in racing applications with up to 18.5 volt charging systems and 80 psi Compact (7.5” long x 3” wide x 2.75” tall) for easy installation on frame rails or other tight areas Weighs only 3.1 lbs.

Example: Part # AT981510ERL. Use of this style fitting will block flow and WILL lead to poor performance and pump failure. The ONLY correct fitting to use is a contoured port fitting with an O-ring seal such as : Part # AT985010ERL.