The aFe Pro GUARD D2 Fuel Filter, part 44-FF019, is a diesel replacement element for the DFS780 fuel system. The manufacturer says the D2 line is engineered to improve flow and efficiency in diesel service and aims for maximum filtration with minimal flow restriction. Because the element is built to work with the factory canister, it is meant to seat in the original housing rather than require modifications, which is the main reason to choose it over a generic filter that may not sit correctly. The manufacturer also states this filter does not require a CARB EO number, which matters for buyers who need to stay within emissions rules.
Fitment centers on the DFS780 system, and the vehicle lists published for this part vary considerably, so confirm your year, engine, and application with the manufacturer before ordering. The manufacturer's listing indicates the filter and coupler are both included, so you should not need to source a separate fitting. Detailed install steps were not confirmed in the manufacturer's documentation, so follow the manufacturer's instructions and prime the system after the swap. Search terms this filter matches include diesel fuel filter DFS780, aFe 44-FF019 replacement, Pro GUARD D2 OE-style fuel filter, and DFS780 fuel filter swap.
The manufacturer states that this product does not require a CARB EO number.
The manufacturer describes the Pro GUARD D2 as a direct OE replacement that uses the factory canisters to ensure a proper fit.
The manufacturer's listing indicates that both the filter and the coupler are included.
