Product Description
Protect your L5P’s injection system with the FASS Drop-In Series Diesel Fuel System, engineered specifically for the 2020–2023 GM 6.6L Duramax L5P (Crew Cab Short Bed). This 100% drop-in assembly mounts in the OEM water separator location, maintains proper water-in-fuel (WIF) light and fuel heater functionality, removes entrained air, and filters particulates down to 2 microns to help prevent costly injector and pump failures.
Why it matters: Modern common-rail systems are extremely sensitive to water, air, and debris. By removing over 99% of water and fine contaminants, the Drop-In Series helps extend component life and deliver consistent fuel supply under load.
Key Features
- True drop-in design for L5P (no frame cutting or tank dropping required)
- Over 99% water separation and 2-micron particulate filtration
- Air/vapor separation to stabilize rail pressure
- Retains OEM WIF sensor and fuel heater functionality for proper alerts
- Backed by FASS limited lifetime warranty
Fitment
- 2020–2023 Chevrolet Silverado 2500/3500 HD, 6.6L Duramax L5P, Crew Cab Short Bed
- 2020–2023 GMC Sierra 2500/3500 HD, 6.6L Duramax L5P, Crew Cab Short Bed
Note: Designed to mount in the OEM water separator location. If you have an oversized/aftermarket fuel tank, verify there is adequate space for the Drop-In assembly before installation.
Specifications for Fass DIFSL5P2001
| Attribute | Value |
|---|---|
| Brand | FASS Fuel Systems |
| Part Number | DIFSL5P2001 |
| UPC | 850044137275 |
| GTIN | 00850044137275 |
| Engine Compatibility | 2020–2023 GM 6.6L Duramax L5P (Crew Cab Short Bed) |
| Filtration / Separation | 2-micron particulate; >99% water separation; air/vapor separation |
| Shipping Weight | 28 lb |
| Package Dimensions | 18 × 14 × 28 in |
| Warranty | FASS limited lifetime warranty |
| Prop 65 | WARNING: Cancer & Reproductive Harm – www.P65Warnings.ca.gov |
