Billet By-Pass Regulator

The QUICK FUEL TECHNOLOGY Billet By-Pass Regulator is a precision fuel pressure control component engineered for carbureted and fuel-injected performance engines running gasoline, E85, or methanol. As a seasoned mechanic, you know that stable fuel pressure is non-negotiable for consistent jetting, throttle response, and overall drivability—especially when dialing in a modified engine or transitioning between fuel types. This bypass-style regulator delivers exactly that reliability, allowing you to maintain your target fuel pressure window while excess fuel safely returns to the tank, preventing vapor lock and over-pressurization that can damage carburetors or injectors.

Built from aluminum and finished in blue and clear anodized coating, this in-line regulator accepts 4.5 to 9 psi and features 8 AN female O-ring ports for both inlet and outlet, plus an 8 AN female O-ring return line and a 1/8 inch NPT vent port for atmospheric reference or boost-referenced tuning. The billet construction ensures durability under thermal and pressure cycling, while the compact footprint—measuring 4.5 by 2.5 by 5 inches and weighing just 0.82 lbs—makes engine bay installation straightforward on tight custom builds. The multi-fuel compatibility (gasoline, E85, methanol) means you're covered whether you're running pump gas or alternative race fuels, making this an intelligent long-term investment.

This regulator suits carbureted street machines, mild-to-moderate EFI builds, and vintage restorations where fuel pressure stability is critical but boost compensation isn't required. The bypass design is ideal for naturally aspirated and low-boost applications; if you're running significant boost pressure, you'll want to reference the vent port to a boost source to maintain consistent fuel delivery. Installation requires standard AN fittings and fuel line—plan for a fuel log or manifold block if running multiple carburetors, and ensure your fuel pump is sized appropriately for your engine's flow demands and your target pressure setting.