Product Description
Wehrli WCF100265 01-10 Duramax FASS Fuel System Relocation Bracket (Crew Cab Only)
The WEHRLI CUSTOM FAB WCF100265 FASS Fuel System Relocation Bracket is built specifically for 2001-2010 Chevy and GMC 6.6L Duramax Crew Cab trucks (LB7, LLY, LBZ, and LMM). This precision laser cut mount relocates your FASS fuel system from the exposed bed-rail area to a secure, hidden position on the inside of the driver side frame rail just in front of the fuel tank.
Moving the pump off the back of the frame helps keep it out of the debris path of the rear tires, cleans up the look of the truck, and simplifies hose routing — especially when you combine your FASS system with a sump-style tank pickup and short FASS filters for maximum ground clearance.
Key Features & Benefits
- Designed for 2001-2010 LB7, LLY, LBZ, LMM 6.6L Duramax Crew Cab trucks.
- Relocates the FASS fuel system to the inside of the driver side frame rail under the truck.
- Moves the lift pump out of the direct debris path of the rear tires for better protection.
- Provides a stealthy, hidden installation when paired with FASS short style filters.
- Simplifies fuel hose routing when using a sump-style tank pickup.
- Mounts using pre-existing frame holes on crew cab models — no welding required.
- Includes grade 8 hardware for a solid, long-lasting installation.
- Zinc primer with semi-gloss black powder coat finish resists rust and corrosion.
- Made in the USA by Wehrli Custom Fabrication (WCFab).
What's Included
- Wehrli WCF100265 FASS fuel system relocation mounting bracket.
- Complete grade 8 mounting hardware kit.
- Installation instructions from Wehrli / FASS (basic hand tools required).
Vehicle Fitment
This bracket is specifically engineered to fit:
- 2001-2010 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax (LB7, LLY, LBZ, LMM) — Crew Cab
- 2001-2010 GMC Sierra 2500HD / 3500HD 6.6L Duramax (LB7, LLY, LBZ, LMM) — Crew Cab
Cab Style: Intended for Crew Cab trucks. Not directly compatible with regular cab or extended cab models using existing frame holes. Some installers have adapted these brackets to other cab configurations with custom drilling and fabrication, but CPP Diesel and WCFab recommend this part primarily for crew cab applications.
Mounting Location & Pump Compatibility
- Mounts on the inside of the driver side frame rail, forward of the fuel tank.
- Keeps the FASS pump tucked up and away for a cleaner side profile and better protection.
- Ideal for FASS Titanium Signature Series and Titanium Signature Series Plus fuel systems sized for 2001-2010 Duramax trucks.
- Works well with sump-style tank pickups and short FASS filters to maximize ground clearance.
Installation Notes
- Bracket uses factory holes on crew cab frames for a direct, bolt-on installation.
- Recommended to mock up pump and bracket before drilling any additional holes or trimming hoses.
- Route fuel and electrical lines away from sharp edges, moving suspension components, and exhaust heat.
- After installation, cycle the FASS system, check for leaks, and verify proper fuel pressure and prime.
- Professional installation is recommended if you are not comfortable working with fuel systems.
Recommended Upgrades & Related CPP Diesel Products
Build a complete, reliable 01-10 Duramax fuel system by pairing the WCF100265 bracket with these components available from CPP Diesel:
- FASS TSC10100G TITANIUM SIGNATURE SERIES 100GPH FUEL SYSTEM FOR 2001-2010 GM 6.6L DURAMAX – a 100 GPH FASS system sized for stock to moderate performance 01-10 Duramax applications.
- FASS TSPC10100G TITANIUM SIGNATURE SERIES PLUS FUEL SYSTEM FOR 2001-2010 DURAMAX – an upgraded plus-series FASS system ideal for trucks up to 600 HP.
- WEHRLI WCF100269 FASS FUEL SYSTEM RELOCATION BRACKET FOR 11-16 CHEVROLET 6.6L DURAMAX (CREW CAB ONLY) – use this if you're outfitting a newer 2011-2016 LML crew cab Duramax.
- WEHRLI WCF100276 17-21 CHEVROLET L5P DURAMAX RELOCATION MOUNT FASS LIFT PUMP – the correct Wehrli FASS relocation bracket for 2017-2021 L5P trucks.
- WEHRLI WCF100840 01-10 CHEVROLET 6.6L DURAMAX TRACTION BAR INSTALL KIT – add traction bars to keep rear axle hop under control as you add power and fuel system upgrades.
Specifications
| Specification | Details |
|---|---|
| Brand | Wehrli Custom Fabrication (WCFab) |
| Manufacturer Part Number | WCF100265 |
| CPP Diesel SKU | WCF100265 |
| Engine Compatibility | 6.6L Duramax LB7, LLY, LBZ, LMM |
| Model Years | 2001-2010 Chevrolet / GMC 2500HD & 3500HD |
| Cab Style | Crew Cab (direct bolt-on using existing frame holes) |
| Mounting Location | Inside driver side frame rail, forward of fuel tank |
| Finish | Zinc primer with semi-gloss black powder coat |
| Included Hardware | Mount bracket and grade 8 mounting hardware |
| Primary Use | Relocation mount for FASS fuel system / lift pump |
| Shipping Weight (approx.) | 5.0 lb |
| Package Dimensions (approx.) | 14.0 in (L) x 6.0 in (W) x 4.0 in (H) |
| Country of Origin | USA |
| Emissions Note | Check local and state regulations regarding fuel system modifications on emissions-controlled vehicles. |
| Prop 65 Warning (California) | WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov |
FAQ
Why should I relocate my FASS fuel system on an 01-10 Duramax?The factory-style bed-rail mounting location leaves the FASS pump exposed to road debris, water, and salt from the rear tires. This Wehrli bracket tucks the system up on the inside of the frame rail, improving protection, cleanliness, and appearance while also simplifying hose routing.
Is the WCF100265 bracket only for Crew Cab trucks?
Yes. It is designed around the frame hole spacing of 2001-2010 Crew Cab Duramax trucks for a direct bolt-on install. Other cab styles may require custom drilling or a different bracket, so CPP Diesel recommends this part primarily for crew cab applications.
Which FASS systems work with this relocation bracket?
This bracket is intended for FASS Titanium Signature Series and Titanium Signature Series Plus systems sized for 2001-2010 GM 6.6L Duramax (100 GPH, 165 GPH, etc.). Always verify your specific FASS kit part number and follow FASS mounting and plumbing guidelines during installation.
Do I have to use short FASS filters with this bracket?
Short filters are highly recommended when you mount the pump on the frame rail to maximize ground clearance and reduce the chance of snagging the filters off-road or in deep snow. Standard-length filters may hang lower than desired depending on ride height and tire size.
Does this bracket come with all the hardware I need?
Yes. The WCF100265 includes the main mounting bracket and grade 8 hardware for attaching it to the frame. Your FASS system will supply the pump-side hardware, hoses, and wiring required to complete the installation.
