6.7 Cummins SureFlo Performance Sending Unit – Fleece FPE-SF-CUMM-1121

Upgrade your 6.7L Cummins fuel system with the Fleece Performance SureFlo Performance Sending Unit. Designed specifically for trucks running an external aftermarket lift pump (FASS, AirDog, etc.), the SureFlo delivers a clean, reliable solution without the drawbacks of traditional draw straws or tank sumps.

Why You Need the SureFlo

When running a frame-mounted lift pump, most installs require either a draw straw or drilling the tank for a sump. Both options commonly cause ¼-tank issues, where the pump pulls air once the fuel level drops, leading to cavitation, fuel starvation, and potential pump damage.

The Fleece SureFlo solves this by replacing your factory sending unit with a direct-fit unit that draws fuel from — and returns fuel to — an integrated bucket assembly at the bottom of the tank. One-way check valves keep fuel flowing smoothly, even at low tank levels, so your lift pump always gets liquid fuel instead of air.

Key Features

• Direct OEM-style fitment — Drops into the stock sending unit location with no tank cutting, drilling, or modifications required
• Factory-style quick disconnects — Clean, professional connection to your stock fuel lines at the tank
• Bucket design with one-way check valves — Eliminates air ingestion and solves common low-fuel cavitation problems
• New fuel level electronics & float — Maintains accurate factory fuel gauge readings
• Heavy-duty billet aluminum cap — Premium construction for long-term durability
• Universal -8 AN ports — Ready for professional custom fuel system plumbing
• Includes new O-ring/flange seal and -8 AN to 3/4"-16 straight male fitting with O-ring

Fitment

• 2011–2024 RAM 2500/3500 6.7L Cummins
• Replaces OEM part number 5145571AA
• Important: This sending unit will NOT work on trucks equipped with the factory 50-gallon fuel tank (common on many 2020+ models). For 50-gallon tank applications, use Fleece part FPE-SF-CUMM-2024-50.

Best For

• Trucks with external aftermarket lift pumps (recommended for pumps up to ~200 GPH)
• High-performance or modified fuel systems
• Anyone wanting the cleanest possible lift pump install without modifying the tank
• Replacement sending unit on trucks that originally came without an in-tank lift pump

Note: This is a sending unit only — it does not include a fuel pump.

The Fleece SureFlo gives you maximum performance from your lift pump with the cleanest, most reliable installation available. No drilling. No ¼-tank headaches. Just dependable fuel delivery.