GFLT Bypass Pressure Regulator Diaphram

The GFLT Bypass Pressure Regulator Diaphragm by Quick Fuel Technology (part number 35-1200QFT) is a dedicated replacement diaphragm kit engineered for fuel systems running alcohol, E85, or gasoline. This diaphragm assembly is the critical control element in bypass-style regulators, responsible for maintaining stable fuel pressure across varying engine loads and temperatures—a function essential to consistent carburetor or fuel injection performance in high-performance and racing applications.

Quick Fuel Technology has designed this diaphragm kit to withstand the chemical and thermal demands of modern fuel blends. Alcohol and E85 fuels present different solvent properties than conventional gasoline, requiring diaphragm materials that resist degradation and maintain accurate pressure calibration over extended use. The diaphragm's flexibility and seal integrity directly affect fuel delivery stability, throttle response, and engine tuning consistency. A worn or compromised diaphragm results in pressure drift, poor idle quality, and difficulty maintaining target fuel delivery parameters during dyno tuning or on-track operation.

This replacement kit is intended for builders and tuners maintaining Quick Fuel Technology bypass regulators in carbureted street engines, race cars, and alternative-fuel vehicles. Whether you're diagnosing unexplained pressure fluctuations, performing preventive maintenance on a fuel system, or rebuilding a regulator after prolonged storage, this OEM-specification diaphragm restores the regulator to factory performance. The compact 4.45 x 1.25 x 5.6 inch package and lightweight 0.08 lb design make it practical for on-vehicle replacement or bench service.