Fuelab 51503-3 Series Adjustable Fuel Pressure Regulator CARB - 515

The Fuelab 51503-3 is part of the 515 Series of adjustable fuel pressure regulators, engineered for high-performance street and racing applications. Built from billet aluminum with a military-spec Type II anodize finish (MIL-A-8625), this regulator combines precision pressure control with broad fuel compatibility — supporting carbureted systems as low as 1 PSID and fuel-injected applications up to 125 PSID. The 515 Series design accepts both port-style and non-port-style union fittings without interference, offering exceptional installation flexibility.

Key Features:

• Two -6AN or -10AN inlet ports and one -6AN return port (located on bottom) for versatile plumbing configurations
• Compatible with gasoline, diesel, methanol, and ethanol fuels
• Billet aluminum construction with military-spec anodize (MIL-A-8625, Type II) for corrosion resistance and durability
• Fine thread pitch adjustment for precise fuel pressure tuning
• 1/8 NPT gauge port with plug for an optional external fuel pressure gauge
• 1/8 NPT pressure reference port with barbed fitting for boost-referenced or vacuum-referenced applications
• Includes versatile mounting bracket and stainless steel hardware
• CARB compliant
• Backed by a 2-year limited warranty

The Fuelab 515 Series fuel pressure regulator is an ideal upgrade or replacement for performance builds requiring reliable, adjustable fuel pressure management across a wide range of fuels and pressure demands.