FASS Drop-In Series Adapter Kit - 3.0L Duramax LM2/LZ0 Silverado & Sierra
Can I pick up my order or have it installed at your shop?
Can I pick up my order or have it installed at your shop?
Absolutely. We offer local pickup on most products and full professional installation at our shop in Washington, MO. Whether you just want to grab your parts or have our techs handle the install, we’ve got you covered. Give us a quick call at 636-429-7020 or message us to schedule a visit — we’ll make sure the parts are ready when you arrive.
How do I know if this part fits my vehicle?
How do I know if this part fits my vehicle?
Unsure if it’ll fit? No problem — that’s what we’re here for. Send us your vehicle’s year, make, and model, and we’ll verify fitment before you order. We can also point you toward compatible upgrades or supporting parts if needed.
What if I need to return a product or it’s defective?
What if I need to return a product or it’s defective?
Most unused items can be returned within 30 days in their original packaging. Some products are covered by a manufacturer’s warranty as well. If something arrives damaged or doesn’t meet your expectations, just let us know — we’ll help you get it replaced, refunded, or repaired. (Tracking updates are also emailed automatically once your order ships.)
What's the lead time on custom or fabricated parts?
What's the lead time on custom or fabricated parts?
Many of our parts are built to order — especially fabricated or performance components. These can take additional time to produce before shipping. Lead times vary by manufacturer and demand, but we’ll always keep you updated along the way. If you’re working on a tight schedule, reach out before ordering at 636-429-7020 and we’ll confirm current availability or estimated ship dates.
Description
Description
Adapter kit only. Pairs with the FASS DIFSL5P2001 Drop-In module to create fitment for 2019-2026 GMC/Chevrolet 1500-Series pickups with the 3.0L Duramax. Ordered together, the two parts make up DIFSLZ01001.
The Drop-In System is not a lift pump. It is an air separation and filtration system that works with your factory in-tank lift pump. Drop-In systems are plug-and-play filtration upgrades and are not compatible with fuel sump kits.
Vehicle Fitment
| Years | Make & Model | Engine |
|---|---|---|
| 2019-2022 | Chevrolet Silverado 1500 / GMC Sierra 1500 | 3.0L Duramax LM2 |
| 2023-2026 | Chevrolet Silverado 1500 / GMC Sierra 1500 | 3.0L Duramax LZ0 |
All cab and box configurations covered.
About the Drop-In Series
The Drop-In Series replaces the plastic OEM single-filter housing with a CNC-machined 6061-T6 billet aluminum dual-filter housing, designed and built in-house. It runs the OEM water separator element in series with the FASS XWS3002 Extreme Water Separator.
Keeping the OEM element is the point: it lets the factory water-in-fuel sensor stay on the dirty side, so the WIF light warns you before water reaches clean fuel. Systems that use a spin-on separator put the sensor on the clean side — by the time the light comes on, it's already too late.
The Extreme Water Separator handles final filtration, down to 2 microns absolute and over 99% of free and emulsified water removed. OEM filtration is rated at 5 microns.
What You Also Need
- DIFSL5P2001 Drop-In Series module — the system this adapter mounts to
Or Buy It Complete
Skip the two-part order and get the module and adapter together: FASS Drop-In Series Diesel Fuel System - 3.0L Duramax LM2/LZ0 (DIFSLZ01001)
