Fleece FPE-34563 PowerFlo Lift Pump Assembly | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML Short Bed

Features:

• Supports up to 800 horsepower
• Reduces strain on factory CP4 pump
• Direct OEM-style in-tank replacement
• Retains factory fuel lines and wiring
• Dual gerotor design for added reliability
• Installs faster than traditional lift pumps
• No need for sumps or draw straws
• Improves fuel delivery and injection longevity
• Threaded outlet accepts -8 O-ring fittings
• Compatible with aftermarket fuel systems
• Cross-references GM part numbers 13578389 and 13578388
• For use with pickup trucks and single-tank setups

Give Your Duramax The Fuel Support It Deserves

If you're still relying on the stock fuel delivery setup in your 2011–2016 LML Duramax, it's time to upgrade to something that truly keeps up with the demands of your truck. The Fleece PowerFlo Lift Pump isn’t just a replacement, it's a serious performance solution designed to take the stress off your injection system while giving you room to grow. From daily driving to full-on performance builds pushing up to 800 horsepower, this in-tank pump has the strength and flow capacity to match. It installs quickly without the need for tank modifications, draw straws, or messy external filtration add-ons. You'll still use your factory fuel lines, making the install not only clean but straightforward and less time-consuming. Plus, you get peace of mind knowing your CP4 isn’t fighting to pull fuel under vacuum. Whether you're towing long miles or planning future upgrades, this pump puts you one step ahead.

Built For Performance Without Complicating The System

The Fleece FPE-34563 PowerFlo Lift Pump is engineered with purpose and precision, designed to work as a direct OEM in-tank replacement on short bed 2011–2016 Duramax trucks. Featuring dual gerotor pump technology, it offers a substantial upgrade in both flow capacity and reliability over the factory vacuum-fed design. The built-in active fill bucket eliminates common lift pump issues such as air ingestion and starvation, especially under aggressive throttle or low fuel conditions. This in-tank design also avoids the need for external draw straws or sumps, making it not only cleaner to install but more efficient long-term. It’s fully compatible with OEM fuel lines, and for those running custom systems, it includes threaded fittings that accept -8 O-ring connections. This pump is also fully capable of supporting dual CP3 configurations, making it a future-proof choice for high-performance builds. Backed by Fleece’s reputation for durability and engineering excellence, this is the kind of upgrade that delivers both now and down the road.

Fits: 2011, 2012, 2013, 2014, 2015, 2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML Short Bed

Notes:

• Designed specifically for 2011–2016 GM 6.6L Duramax LML short bed pickups
• Supports fuel systems up to 800 horsepower, including dual CP3 setups
• Direct in-tank replacement using OEM fuel lines and wiring
• Installs faster than traditional frame-mounted lift pumps
• Active fill bucket design eliminates the need for draw straws or sumps
• Reduces CP4 pump strain by supplying positive fuel pressure
• Not intended for cab and chassis or dual-tank configurations
• Pump includes threaded outlet and return for aftermarket compatibility
• Cross-reference compatible with GM part numbers 13578389 and 13578388
• Must verify correct part number for cab and chassis applications before ordering