Check the listing for details. Fuel Pressure Regulator Holley Carburetor Carb Quick Fuel 30-805 4 1/2 - 9 PSI. Condition: New. Listed at 44.95 USD. QUICK FUELBRAND# 30-805FUEL PRESSURE REGULATOR4 1/2 - 9 PSI3/8 NPT PortsFEATURES:BLACK ANODIZED METHANOL/E85/ALCOHOL/GAS FUELSPRESSURE REGULATOR WITH BALL AND STEM ACITIVATION, AND GLFT DIAPHRAGM A HIGH FLOW CAPACITY FOR SINGLE 4 BARREL ENGINES UP TO 600 HPBENEFITSEnables you to regulate your fuel pressure based on your carburetor and vehicle application needs. Too much fuel pressure can "blow-out" your needle and seat assemblies or cause you to run "rich" giving what you think to be "carburetor" problems!Regulate your fuel properly. Will not work with fuel injection vehicles converted to carbureted that use a high pressure in-tank fuel pumps! Cannot be used to regulator down fuel pressure on vehicles with high pressure in-tank fuel pumps!Maximum head pressure before installing cannot be more than 6 1/2 - 7 lbs of fuel pressure.Holley carburetors MUST HAVE 6 1/2 psi - 7 psi Quick Fuel carburetors MUST HAVE 6 1/2 - 7 psi Features: *Big 3/8” NPT ports (1 in, 2 out). The (2) dual outlet ports are designed for dual fuel inlet carburetors or fuel block systems. *Quieter fuel pump operation *Designed only for carburetor use *Preset to 6 1/2 PSI *Adjustable from 4-1/2 to 9 PSI INCLUDES: REGULATORMOUNTING PLATEMOUNTING SCREWSINSTRUCTIONS QUICK FUEL carburetor parts you can count on. Edelbrock carburetors MUST HAVE 4 1/2 - 5 psi