Fleece Performance 11-21 Dodge Ram w/ Cummins SureFlo Performance Sending Unit - FPE-SF-CUMM-1121

The Fleece Performance SureFlo Performance Sending Unit (FPE-SF-CUMM-1121) is a direct-fit fuel system upgrade engineered specifically for 2011–2021 Dodge Ram trucks equipped with the 6.7L Cummins diesel engine. If you've installed or are planning to install an aftermarket frame-rail mounted lift pump, this sending unit is the clean, no-drill solution that eliminates the quarter-tank cavitation problem once and for all — keeping fuel flowing reliably to your pump at every fill level.

Key Features & Benefits

• Eliminates the Quarter-Tank Fuel Starvation Problem: Traditional external lift pump setups require drilling the tank for a sump or running a draw straw — both of which risk pulling air into the fuel system when the tank drops below one-quarter full. The SureFlo's bucket assembly pulls diesel from the bottom and returns it to the bucket, preventing air ingestion regardless of fuel level.
• No Tank Cutting or Drilling Required: The SureFlo installs in the OEM sending unit location using factory-style quick-disconnect fittings that connect directly to your stock fuel lines at the tank. No tank modification means a cleaner install, no warranty headaches from drilling, and a job any experienced DIYer can tackle.
• One-Way Check Valves for Consistent Flow: Even at low fuel levels, the integrated one-way check valves on the unit allow diesel to flow freely and continuously to your lift pump, keeping your injection system fed under all driving conditions.
• Heavy-Duty Billet Aluminum Cap: The cap is machined from billet aluminum for durability that outlasts the factory plastic unit — critical on a high-mileage or high-output diesel build.
• New Fuel Level Electronics & Fuel Float: The sending unit ships with new fuel level electronics and a new fuel float, so your gauge reads accurately after installation — no need to reuse worn OEM components.
• New O-Ring / Flange Seal: A fresh sealing surface is included to ensure a leak-free installation right out of the box.
• -8 AN Ports for Professional Plumbing: Universal -8 AN ports allow flexible, professional-grade plumbing of a custom fuel setup, and the unit includes a -8 AN to 3/4"-16 straight male fitting with O-ring for common lift pump connections.
• Designed to Work With Aftermarket Lift Pumps: The SureFlo is specifically engineered to maximize flow from frame-rail mounted aftermarket lift pumps — a purpose-built solution rather than a generic workaround.

Specifications

• Part Number: FPE-SF-CUMM-1121
• Brand: Fleece Performance Engineering
• Cap Material: Heavy-duty billet aluminum
• Fuel Port Size: -8 AN (universal ports)
• Included Fitting: -8 AN to 3/4"-16 straight male fitting with O-ring
• Fuel Level Sender: New electronics and fuel float included
• Seal: New O-ring / flange seal included
• OEM Reference: Fits applications using original part number 5145571AA
• CARB Status: Not CARB legal; not for sale in California
• UPC: 670875717473

Fitment

The Fleece Performance FPE-SF-CUMM-1121 SureFlo fits 2011–2021 Dodge Ram trucks with the 6.7L Cummins diesel engine that use OEM sending unit part number 5145571AA. Before ordering, confirm your truck uses that OEM reference to ensure correct fitment.

Important Exclusions:

• This sending unit will NOT work with the 50-gallon fuel tank option.
• This unit is not intended for gas-engine or non-Cummins Ram applications.
• Different SureFlo part numbers are available for other Cummins generations (e.g., FPE-SF-CUMM-0509 for 05–09, FPE-SF-CUMM-9802 for 98–02, and FPE-SF-CUMM-1124-CCMS for 11–24 Ram 4500/5500 with a 22-gallon tank). Make sure you have the correct unit for your specific truck.

What's in the Box

• Fleece Performance SureFlo sending unit assembly with billet aluminum cap
• New fuel level electronics and fuel float
• New O-ring / flange seal
• -8 AN to 3/4"-16 straight male fitting with O-ring

Why Buy from ThreePiece.us

At ThreePiece.us, we specialize in diesel performance parts and have the technical knowledge to help you find the right SureFlo sending unit for your specific Cummins-powered Ram — including confirming tank size compatibility before your order ships. Every order ships free, and if you'd rather spread out the cost, we offer financing through Affirm so you can get your fuel system upgrade on the truck now and pay over time. Questions about fitment or installation? Our team is here to help before and after the sale.

Frequently Asked Questions

Q: Why do I need the SureFlo sending unit if I already have an aftermarket lift pump?

A: Frame-rail mounted aftermarket lift pumps typically require either drilling a hole in your fuel tank for a sump or running a draw straw to pull fuel. Both methods can allow air to enter the fuel system when the tank drops below roughly one-quarter full, causing cavitation in the lift pump. The SureFlo replaces your stock sending unit in the factory location — no drilling required — and uses a bucket assembly with one-way check valves to ensure air-free fuel delivery even at low tank levels.

Q: Will this fit my Ram if I have the 50-gallon fuel tank?

A: No. Fleece Performance specifically notes that the FPE-SF-CUMM-1121 will NOT work on the 50-gallon tank. If you have the 50-gallon option, contact us before ordering so we can help identify the correct part.

Q: How do I know if this is the right sending unit for my specific year?

A: This unit fits 2011–2021 Dodge Ram trucks with the 6.7L Cummins that use OEM sending unit part number 5145571AA. Check your existing sending unit or your OEM parts lookup against that number to confirm. Fleece also offers year-specific SureFlo units for other Cummins generations, so if your truck falls outside 2011–2021, a different part number applies.

Q: Does installation require cutting or modifying the fuel tank?

A: No. The SureFlo is an OEM-style, direct-fit replacement that installs in the stock sending unit location using factory-style quick-disconnect fittings to connect to your existing fuel lines. No tank cutting or drilling is required.