High-Speed Bypass; 65 - 130 PSI with 6AN fitting

The KINSLER High-Speed Bypass fuel valve with 6AN fitting (Model 3981) is a precision-engineered fuel system component designed specifically for high-performance and race applications. It is ideal for experienced mechanics and dedicated enthusiasts who require reliable fuel pressure regulation and bypass control. This valve is particularly beneficial in scenarios where optimal fuel delivery is critical, such as aggressive throttle transitions and high-speed cornering.

Operating within a pressure range of 65–130 PSI, this KINSLER bypass valve ensures consistent pressure stability across various operating conditions. The internal valve geometry is optimized for high-flow, low-restriction operation, which allows excess fuel to bypass the main system without causing pressure spikes that could potentially damage injectors or carburetors. The 6AN JIC / Push-Lock fitting type provides a direct, leak-free connection to standard aftermarket fuel rails, regulators, and distribution blocks.

Mechanics and tuners working on turbocharged, supercharged, or fuel-injected engines will appreciate the reliability and repeatability that this KINSLER valve offers. Its compact 1.5 × 1.5 × 5-inch form factor and lightweight 0.5-pound design make it easy to integrate into tight engine bays and custom fuel system layouts. Whether you're tuning a forced-induction engine or upgrading an existing setup, this valve is a crucial component for achieving precise fuel management.