Product Description
FLEECE FPE-34563 2011-2016 GM LML DURAMAX (SHORT BED) POWERFLO LIFT PUMP ASSEMBLY
The FLEECE FPE-34563 PowerFlo Lift Pump is a high-performance, in-tank OEM replacement designed specifically for 2011–2016 GM 6.6L LML Duramax short bed trucks. By delivering consistent positive fuel pressure to the CP4, this in-tank lift pump supports up to 800 horsepower while improving reliability, reducing cavitation, and eliminating the fuel starvation issues that can lead to premature injection pump failure.
Key Features
- In-tank OEM replacement: Installs inside the factory tank, retaining factory fuel lines, fuel heater, and water-in-fuel sensor for a clean, quiet installation.
- Supports up to 800 HP: Dual gerotor design supplies the fuel volume needed for tuned LML trucks, towing builds, and performance applications.
- Positive fuel pressure to the CP4: Reduces stress on the injection pump, helping prevent costly CP4 failures associated with vacuum-fed systems.
- Short bed specific: Engineered for 6.5-foot bed 2011–2016 Silverado/Sierra 2500/3500 LML trucks with a single rear-mounted tank.
- Aftermarket ready: Outlet and return ports are threaded for -8 O-ring fittings (3/4"-16), making it easy to integrate aftermarket fuel lines and filters.
- OEM-level integration: Active fill bucket design eliminates the need for tank sumps, draw straws, or drilling the tank, while maintaining consistent fuel supply at low tank levels.
- Lifetime warranty: Backed by Fleece Performance Engineering for long-term peace of mind when you push your Duramax harder.
Vehicle Fitment
This FLEECE FPE-34563 PowerFlo Lift Pump fits the following vehicles:
- 2011–2016 Chevrolet Silverado 2500HD 6.6L LML Duramax – short bed (6.5 ft)
- 2011–2016 Chevrolet Silverado 3500HD 6.6L LML Duramax – short bed (where equipped)
- 2011–2016 GMC Sierra 2500HD 6.6L LML Duramax – short bed (6.5 ft)
- 2011–2016 GMC Sierra 3500HD 6.6L LML Duramax – short bed (where equipped)
Important fitment notes:
- For short bed pickup trucks with a single rear-mounted fuel tank only.
- Not designed for cab & chassis trucks – verify OE pump part numbers before ordering.
- Not for long bed applications (see cross-reference below).
Cross-Reference & Related Fleece Products
Use these related Fleece products on CPP Diesel to build a complete, high-flow fuel system around your LML Duramax:
- Long bed LML in-tank lift pump: FLEECE FPE-34564 2011-2016 GM LML DURAMAX (LONG BED) POWERFLO LIFT PUMP ASSEMBLY
- LB7 Duramax PowerFlo in-tank lift pump: FLEECE FPE-PF-GM-0104 POWERFLO LIFT PUMP FOR 01-04 SIERRA 2500/3500 DURAMAX
- 2004.5–2007 GM PowerFlo in-tank lift pump: FLEECE FPE-34789 2004.5-2007 GM POWERFLO IN-TANK LIFT PUMP
- 2007.5–2010 GM PowerFlo in-tank lift pump: FLEECE FPE-34790 2007.5-2010 GM POWERFLO IN-TANK LIFT PUMP
- Duramax high-flow CP3 upgrade: FLEECE FPE-DMAX-CP3-10MM DURAMAX POWERFLO 750 CP3
GM OE cross-reference (for compatibility verification):
PowerFlo Part Number: FPE-34563 – Short Bed (6.5 ft) replacement for GM/Chevy P/N 13578389 and 13578388.
Installation & Use
- Direct drop-in replacement for the factory in-tank sender/pump module.
- Retains factory water-in-fuel sensor, fuel heater, and OE fuel line routing.
- Outlet and return ports threaded for -8 O-ring fittings (3/4"-16) for custom fuel plumbing if desired.
- Ideal companion to CP3 conversions and performance tuning that increases fuel demand.
Specifications for FLEECE FPE-34563
| Specifications for FLEECE FPE-34563 | |
|---|---|
| Brand | Fleece Performance Engineering |
| Part Number | FPE-34563 |
| UPC | 670875716155 |
| GTIN (UPC-12) | 670875716155 |
| Engine | 6.6L LML Duramax Diesel |
| Model Years | 2011–2016 |
| Vehicle Applications | Chevrolet Silverado 2500/3500 HD, GMC Sierra 2500/3500 HD – Short Bed Only |
| Bed Length | Short bed (approx. 6.5 ft) |
| Max Supported Horsepower | Up to 800 HP (with proper supporting mods) |
| Fuel System Type | In-tank lift pump, dual gerotor |
| Inlet/Outlet Threads | -8 O-ring (3/4"-16) |
| GM OE Cross Reference | 13578389, 13578388 (short bed assemblies) |
| E-codes | Not specified |
| Country of Origin | USA (where stated by suppliers) |
| Shipping Weight | Approx. 12 lbs |
| Package Dimensions (WxHxL) | 10.0" x 12.0" x 22.0" |
| Shipping Method | Free Ground Shipping (continental U.S.) |
| Warranty | Lifetime limited warranty (Fleece Performance) |
| Prop 65 Warning | WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov |
FAQ
No. FPE-34563 is specifically designed for short bed 2011–2016 GM 6.6L LML Duramax pickup trucks with a single rear-mounted fuel tank. Long bed applications should use FPE-34564, and cab & chassis trucks must verify OE part numbers before ordering.
Will this pump support my tuned or modified LML Duramax?
Yes. The dual gerotor PowerFlo design is rated to support up to 800 HP with the proper supporting modifications (injectors, turbo, and tuning). It is an excellent choice for trucks with mild to aggressive tuning and CP3 conversion kits.
Do I need to add an external frame-mounted lift pump or tank sump?
No. The PowerFlo Lift Pump is an in-tank OEM replacement that eliminates the need for external lift pumps, draw straws, or tank sumps in most builds. The active fill bucket and in-tank design ensure reliable fuel pickup, even at low fuel levels.
Will this pump help protect my CP4 injection pump?
Yes. The factory LML relies on CP4 vacuum to pull fuel from the tank, which increases stress and can contribute to premature CP4 failure. By supplying positive fuel pressure to the CP4, the PowerFlo lift pump reduces strain on the injection pump and improves long-term reliability.
Can I use aftermarket fuel filters or custom fuel lines with this pump?
Absolutely. The outlet and return ports are threaded for -8 O-ring fittings (3/4"-16), making it easy to integrate aftermarket fuel filters, upgraded lines, or custom fuel system layouts while still benefiting from the in-tank design.
