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Silver cylindrical spin-on fuel filter with drain bowl and sensor port

Baldwin Filters

Baldwin Filters BF1273-SP Fuel Filter Spin-On Separator

SKU CH-0X0Y-CF7RH

Spin-on fuel filter and water separator with drain, sensor port and integral post seal

  • Fuel/water separation protects injection systems with spin-on separator design
  • Sensor port enables water detection using 1/2-20 thread specification
  • Integral post seal prevents bypass leaks for reliable filtration
  • Compact dimensions fit tight engine bays at 6 9/16 in height
  • 1 in.-14 thread size ensures direct compatibility with existing fuel lines

Fuel/Water Separator with Sensor Port

The Baldwin Filters BF1273-SP is a spin-on fuel filter that separates water from diesel or gasoline. It fits heavy-duty trucks, agricultural equipment and marine engines that require a 1-inch minus-14 thread connection and an integrated sensor port. The unit ships new and includes the integral post seal and O-ring for immediate installation.

Replaces Standard Spin-On Filters Without Drain

This separator upgrades a basic spin-on filter by adding a drain valve and a 1/2-20 sensor port for water-in-fuel detection. The jump is worth it when the application demands continuous water removal and electronic monitoring rather than manual inspection alone. It does not suit systems that lack the matching thread size or that require a cartridge-style element instead of a spin-on housing.

Direct Spin-On Installation With Included Seals

Installation is a straightforward hand-tighten procedure using the supplied O-ring and integral post seal; no special tools are required. The most common issue is cross-threading the 1-inch minus-14 thread or over-tightening, which can damage the seal and cause leaks. Ensure the mating surface is clean and the sensor port is plugged or wired before pressurising the system.

Highlights

  • Fuel/water separation protects injection systems with spin-on separator design
  • Sensor port enables water detection using 1/2-20 thread specification
  • Integral post seal prevents bypass leaks for reliable filtration
  • Compact dimensions fit tight engine bays at 6 9/16 in height
  • 1 in.-14 thread size ensures direct compatibility with existing fuel lines

Specifications

BrandBALDWIN FILTERS

Questions about this item

What are the exact height and outside diameter dimensions of the BF1273-SP filter?

The filter height is 6 9/16 in and the outside diameter is 4 1/4 in, so verify the mounting clearance matches these measurements.

How is the spin-on filter installed and what is the common mistake with the integral post seal?

Spin the filter onto the 1 In.-14 thread until the O-ring contacts the base, then tighten by hand; the mistake is using a wrench which can crush the integral post seal.

When should the fuel filter element be replaced and what indicates the sensor port needs attention?

Replace the spin-on element at the engine manufacturer’s service interval; inspect the 1/2-20 sensor port for leaks or corrosion each time the bowl is drained.

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