Baldwin Filters BF1399-SP Fuel Water Separator Filter

The Baldwin BF1399-SP Fuel/Water Separator Spin-On Filter is a diesel-fuel filtration cartridge that combines a water-separator function with a drain and sensor-port option, designed for quick replacement on standard spin-on bases. It removes water and particulates from fuel to protect fuel-injection systems and diesel engines in heavy‑duty applications, helping prevent corrosion, injector damage, and fuel-system fouling. This BF1399-SP version uses a 1-14 threaded inlet/outlet, with an outside diameter of 4 1/4 inches and a length of 7 5/8 inches, making it compatible with Baldwin filter bases that match these dimensions. The included drain valve allows periodic removal of accumulated water without dismantling the filter, and the sensor-port variant enables connection to water-in-fuel monitoring systems for early warning of contamination. Typical installations include trucks, buses, and various construction or agricultural equipment that rely on clean fuel delivery to maintain reliable starting and steady engine performance. In one compact spin-on unit, the BF1399-SP delivers straightforward service, consistent filtration, and the practical benefits of having an integrated water drain and sensor port for proactive fuel management.