Baldwin BF1271 Fuel Water Separator Filter

Baldwin BF1271 Fuel Water Separator Filter

The Baldwin BF1271 is a fuel water separator filter for Cummins ISB Series Engines. It is built with an integral post seal, sensor port thread of 1 1/4-10, and an M20 x 1.5 thread for the specified application.

Use this Baldwin fuel water separator filter when servicing Cummins ISB Series Engines and replacing Cummins 3942533. The BF1271 is a direct-fit service part for diesel fuel systems that require water separation and a sealed filter interface.

Key Features

• Part number: BF1271
• Fuel water separator filter for diesel fuel delivery systems
• Fits Cummins ISB Series Engines
• Replaces Cummins 3942533
• Sensor port thread: 1 1/4-10
• Thread: M20 x 1.5
• Height: 5 3/8 in. (136.5 mm)
• Outside diameter: 3 11/16 in. (93.7 mm)
• Integral gasket: G401
• End seals included
• O-ring included

Detailed Description

Baldwin BF1271 is a fuel water separator filter engineered for Cummins ISB Series Engines. It uses an integral post seal and includes the specified O-ring and end seals, with a caution that the furnished O-ring must be installed on the post for proper sealing. The filter measures 5 3/8 inches tall and 3 11/16 inches in outside diameter, and it carries the listed sensor port and thread specifications for the intended fuel system setup. For buyers searching for a Baldwin BF1271 fuel water separator filter for Cummins ISB Series Engines or a replacement for Cummins 3942533, this part provides the required service dimensions and sealing details.

This part cross-references Cummins 3942533 for the same application.

Common Service Issues Addressed

• Water contamination in diesel fuel
• Restricted fuel flow from a loaded separator element
• Fuel system sealing concerns at the post or gasket interface
• Service replacement for a worn or contaminated separator filter
• Sensor-port related filter service requirements

Installation Notes and Tips

Confirm the filter thread, sensor port thread, and overall dimensions before installation. Install the furnished O-ring on the post as directed to achieve a proper seal. Verify that the integral gasket and end seals are seated correctly during service, and follow the vehicle or engine service procedure for fuel system priming after replacement.

Quality Assurance

Baldwin manufactures filtration components for diesel fuel service applications, and this BF1271 filter is built to the listed dimensional and sealing specifications for Cummins ISB Series Engines.