SKU: RPCR5857
UPC: 859828585707
MPN: R5857
The 5/16in & 3/8in Adjustable Fuel Regulator from Racing Power Co-Packaged is an essential component for any serious fuel system modification or performance upgrade. Whether you're fine-tuning a naturally aspirated engine, installing a turbocharger, or upgrading to a higher-flow fuel pump, this regulator gives you precise control over fuel delivery pressure. Built for street machines, circle-track racers, and engine builders, this dual-port fuel regulator ensures optimal fuel atomization and combustion efficiency across varying throttle conditions and engine loads.
This adjustable fuel regulator accommodates both 5/16-inch and 3/8-inch fuel line connections, making it compatible with a wide range of classic and modern fuel systems. The regulator maintains consistent rail pressure by bypassing excess fuel back to the tank, preventing pressure spikes that can damage injectors or cause overly rich fuel mixtures. The adjustment mechanism allows you to dial in pressure from idle to wide-open throttle, critical for custom carbureted engines or aftermarket EFI conversions where factory specifications don't apply. Compact dimensions (3.9 x 2.85 x 5.95 inches) and lightweight construction (0.75 lbs) make installation straightforward in tight engine bays without compromising performance or reliability.
Engine builders, hot rodders, and performance enthusiasts rely on this regulator when transitioning from carburetors to fuel injection or upgrading fuel delivery systems on modified engines. It's ideal for applications where OEM fuel pressure specifications no longer match your engine's output, such as when installing larger injectors, adding forced induction, or converting to high-octane tune-up configurations. Proper fuel pressure regulation prevents lean-out conditions at peak RPM, eliminates vapor lock in high-heat environments, and extends fuel pump and injector lifespan. Installation requires basic mechanical skill and familiarity with fuel system safety protocols; always relieve fuel pressure before disconnecting lines.
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