Fuel Filter Housings
Fuel filter housings usually get ignored until the truck starts pulling air, leaking fuel, or struggling to start after sitting. Once contamination reaches the filter seat or seals begin failing, the repair tends to snowball into a larger drivability problem.
Mostly stay with direct OE-style replacements while others move toward upgraded filtration setups with easier service access. Alliant Power and Fleece Performance Engineering both offer popular replacement options for Ford, GM, and Ram diesel applications.