Filtration
Best Fuel Filters for Class 8 Trucks (2026)
Quick answer
Class 8 fuel filters should be changed per OEM interval — typically every 15k–30k miles depending on fuel quality. A primary separator plus secondary element setup protects injectors on modern high-pressure common-rail engines.
Our top picks
Comparison
| FS19765FLG - FUEL FILTER SEPARATOR | 23530645 - FUEL ELEMENT FILTER | K37-1029 - FUEL FILTER ELEMENT | |
|---|---|---|---|
| Live price | $36.25 | $69.64 | $72.75 |
| SKU | FS19765FLG | 23530645 | K37-1029 |
| Filter type | Water separator | Secondary element | Spin-on element |
| Best for | Primary filtration | Engine-mounted secondary | Fleet PM stock |
| Change interval | 15k–30k mi | With primary | 15k–30k mi |
Our data
This guide uses live prices from the PartsNow catalog (~16,900 SKUs). Prices shown reflect current sell pricing with standard markup. We rank by fleet relevance, catalog availability, and common Class 8 replacement patterns — always confirm exact fitment with your part number before ordering.