Fleece Performance PowerFlo In-Tank Lift Pump – 2011-2016 LML Duramax (Short Bed) – FPE-34563

Protect your CP4 and feed your LML the fuel it needs with the Fleece PowerFlo In-Tank Lift Pump.

Factory LML trucks rely on the CP4 to pull fuel from the tank under vacuum. That constant strain is a known contributor to premature CP4 failure. The PowerFlo eliminates the vacuum by delivering positive fuel pressure (10-13 psi at idle) directly to the injection pump. It’s the only in-tank lift pump capable of supporting up to 800 hp, including dual CP3 setups.

Key Features

• Direct OEM-style in-tank replacement that retains the factory fuel lines
• Dual OEM-quality gerotor pumps for higher flow and improved reliability
• Active fill bucket design — no tank sump, draw straw, or low-fuel issues
• Threaded -8 O-ring outlet/return (3/4"-16) for easy aftermarket fuel line or filter upgrades
• Validated for up to 20% biodiesel
• Lifetime Limited Parts Warranty
• CARB EO D-834-22

Fitment: 2011-2016 GM 6.6L LML Duramax short bed (6.5') trucks with single fuel tank.

Note: Long bed trucks use FPE-34564. Does not fit S&B tanks. Cab & chassis applications require verification.

Cross-references GM/Chevy part numbers 13578389 & 13578388

The PowerFlo installs significantly faster than traditional external lift pump kits while delivering the flow and pressure needed for both stock and high-performance builds. Pair it with Fleece’s Auxiliary Heated Fuel Filter Kit for a complete upgraded fuel system.