Product Description
The FLEECE FPE-34564 2011-2016 GM LML DURAMAX (LONG BED) POWERFLO LIFT PUMP ASSEMBLY is a true OEM-style in-tank replacement designed specifically for 8-foot long bed LML trucks. Engineered by Fleece Performance for 2011-2016 Silverado and Sierra 2500/3500 models with the 6.6L Duramax LML, this PowerFlo unit delivers the fuel volume and pressure your CP4 needs to reliably support up to 800 HP while maintaining quiet, factory-like operation.
From daily towing to performance builds, the PowerFlo in-tank lift pump eliminates low-pressure fuel issues and the quarter-tank starvation problems common with frame-mounted pumps. A dual gerotor design, active fill bucket, and direct-use of the factory fuel lines make this a clean, bolt-in solution that installs in less time than most external lift pump systems.
Key Features
- Direct OEM in-tank replacement – drops into the factory tank location with no drilling, cutting, or external sump required.
- Supports up to ~800 HP – dual OEM-quality gerotor pumps supply enough fuel for stock trucks up through high-horsepower builds with CP3 conversion and tuning.
- Reduced CP4 stress – provides positive fuel pressure to the high-pressure pump, helping reduce cavitation and improve pump life.
- Retains factory hardware – keeps your stock fuel lines, water-in-fuel sensor, and fuel heater for a clean, serviceable install.
- Active fill bucket design – solves typical 1/4-tank issues by keeping the pump pickup supplied without draw-straws or sumps.
- Aftermarket ready – outlet and return are threaded for -8 O-ring fittings (3/4"-16) if you want to run custom fuel lines or filters.
- Lifetime warranty from Fleece – backed by one of the most trusted names in diesel performance.
Fitment
- 2011-2016 Chevrolet Silverado 2500HD 6.6L LML Duramax – long bed (8'), single-tank pickup only
- 2011-2016 Chevrolet Silverado 3500HD 6.6L LML Duramax – long bed (8'), single-tank pickup only
- 2011-2016 GMC Sierra 2500HD 6.6L LML Duramax – long bed (8'), single-tank pickup only
- 2011-2016 GMC Sierra 3500HD 6.6L LML Duramax – long bed (8'), single-tank pickup only
Notes: For pickup-style trucks with a single fuel tank. On cab-and-chassis or dual tank configurations, verify your OE pump part number against the cross-reference information before ordering.
Cross-Reference & Related Fleece Products
This PowerFlo assembly replaces the factory in-tank module used on long bed LML trucks and cross-references common GM part numbers used on these applications.
- Fleece PowerFlo P/N: FPE-34564 – Long Bed (8')
- GM/Chevy OE P/Ns: 13578389, 13578388
- Short Bed Version: FLEECE FPE-34563 2011-2016 GM LML DURAMAX (SHORT BED) POWERFLO LIFT PUMP ASSEMBLY
Looking for other GM Duramax PowerFlo solutions from Fleece? Check out these related CPP Diesel listings:
- FLEECE FPE-34789 2004.5-2007 GM POWERFLO IN-TANK LIFT PUMP
- FLEECE FPE-PF-GM-0104 POWERFLO LIFT PUMP FOR 01-04 SIERRA 2500/3500 DURAMAX
- FLEECE FPE-SF-GM-0410 SUREFLO PERFORMANCE SENDING UNIT FOR 04.5-10 SILVERADO/SIERRA 2500/3500 DURAMAX
Why Choose the FPE-34564 PowerFlo From CPP Diesel?
- Genuine Fleece Performance Engineering product – no knockoffs.
- Hand-picked for 2011-2016 LML long bed applications to avoid fitment surprises.
- Perfect foundation for CP3 conversion kits, tuning, and larger injectors.
- Backed by CPP Diesel’s diesel-focused tech support and fast shipping.
Specifications for FLEECE FPE-34564
| Specifications for FLEECE FPE-34564 | |
|---|---|
| Brand | Fleece Performance Engineering |
| Part Number | FPE-34564 |
| Engine | GM 6.6L Duramax LML (2011-2016) |
| Bed Length / Tank Type | Long Bed (8'), single fuel tank pickup |
| UPC | 670875716162 |
| GTIN | 670875716162 |
| Cross Reference | Fleece: FPE-34564 (Long Bed), FPE-34563 (Short Bed) GM / Chevy OE: 13578389, 13578388 |
| E-Codes / Emissions | Not specified by manufacturer (fuel system component) |
| Horsepower Support | Up to approximately 800 HP (with proper supporting mods) |
| Country of Origin | USA |
| Shipping Weight (approx.) | ~10.2 lb |
| Shipping Dimensions (approx.) | ~23" L x 13.2" W x 10.8" H |
| Fuel Type | Diesel |
| Warranty | Lifetime limited warranty (manufacturer) |
| Prop 65 Warning | WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov |
FAQ
Will this FPE-34564 PowerFlo lift pump fit my 2011-2016 LML if I have a short bed?
No. This part number is engineered specifically for 8-foot long bed trucks with a single factory fuel tank. Short bed LML trucks should use FPE-34563 .
Do I have to change my factory fuel lines or add a sump with this pump?
No. The PowerFlo lift pump is an in-tank module that re-uses your factory fuel lines, water-in-fuel sensor, and fuel heater. Its active fill bucket design eliminates the need for a draw straw, tank sump, or other add-on pickups in most builds.
How much power can the FPE-34564 PowerFlo support?
When used in a properly set up fuel system, the dual gerotor design is capable of supporting up to roughly 800 HP, including trucks with CP3 conversion kits, tuning, and upgraded injectors. Always confirm total fuel system requirements for your specific build.
Is this pump compatible with Titan or other aftermarket larger fuel tanks?
The FPE-34564 is designed as a direct replacement for the factory LML long bed fuel tank. Some larger aftermarket tanks may accept this module, but you should always verify fitment with the tank manufacturer’s PowerFlo compatibility data before ordering.
Can I run aftermarket filters or custom fuel plumbing with this lift pump?
Yes. The pump outlet and return are threaded to accept -8 O-ring fittings (3/4"-16 thread), allowing you to plumb aftermarket filters or custom fuel lines while still benefiting from the in-tank PowerFlo design.
