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Fuel Water Separator Filters

Frequently Asked Questions

A single element is appropriate when only that service item is due. A filter pack can make more sense on systems that use both a particulate filter and a water-separator element and call for both to be serviced together. Match every element in the pack to the exact AirDog, FASS, or other system it is intended to service.

Follow the vehicle, lift-pump, or separator manufacturer service interval and replace the element sooner if the system shows excessive restriction, contamination, or water loading. A separator that has a drain should also be serviced according to its instructions. Do not wait for a fuel-delivery problem if the filter has already reached its scheduled interval.

Match the replacement element to the separator or lift-pump system it was designed for. Filter dimensions, threads, seals, filtration design, and water-separation media can differ even when two filters look similar. Use the system or manufacturer part number as the primary reference before choosing a replacement.

A fuel filter is designed to capture particles and debris, while a fuel-water separator is designed to remove water from the fuel stream as well as provide filtration in many systems. Diesel applications are especially sensitive to water contamination. Use the filter or separator type specified for the fuel system rather than treating the two terms as interchangeable.