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The Fleece Performance SureFlo Performance Sending Unit (FPE−SF−CUMM−0304) offers a definitive remedy for the chronic fueling vulnerabilities plaguing modified 2003–2004 5.9L Cummins diesel engines. When upgrading to a high-flow, externally mounted aftermarket lift pump, enthusiasts are traditionally forced to alter their fuel tanks with suction tubes ("draw straws") or bottom-mount sumps. Both modifications introduce severe engineering liabilities, most notably the "quarter-tank issue." Under low-fuel conditions, sloshing uncovers the pickup point, causing the pump to draw air into the fuel system. This induction of air leads to pump cavitation—a destructive phenomenon where vapor bubbles collapse violently under pressure, eroding internal components, dropping fuel pressure, and potentially starving your engine under load.
The SureFlo engineered solution completely bypasses these plumbing vulnerabilities by utilizing an active fuel bucket assembly that integrates seamlessly into your factory tank configuration.
- Zero Tank Modification: Drops directly into the stock sending unit location without requiring you to cut, drill, or permanently alter your fuel tank.
- Active Bucket Assembly: Utilizes dual-acting fuel dynamics by constantly drawing from and returning fuel directly to the base bucket, maintaining a flooded pickup and eliminating quarter-tank starvation.
- Integrated One-Way Check Valves: Engineered with submersed check valves at the base that allow fuel to freely flood the reservoir during low-level operation, keeping the pump fed even during hard acceleration or steep angles.
- Premium Material Construction: Features a robust, heavy-duty billet aluminum cap alongside a brand-new fuel level sender and float assembly to restore precise dashboard gauge accuracy.
- Versatile Plumbing Options: Outfitted with factory-style quick-disconnect fittings to adapt directly to stock fuel lines, alongside universal -8 AN ports for those plumbing high-volume custom fuel systems.
- Installation & Warranty Security: Includes a fresh tank O-ring or flange seal for a leak-free closure, backed by a 1-Year Limited Parts Warranty.
Beyond its utility as an upgrade for high-performance fuel pumps, this sending unit serves as a pristine mechanical replacement for trucks originally manufactured without an in-tank pump. Whether you are correcting a failed factory fuel level sensor or engineering a high-delivery custom fuel system from scratch, the SureFlo unit delivers the cleanest, most reliable plumbing architecture available. By maintaining continuous fuel submersion around the pickup point, you protect your aftermarket investment from dry-running damage while ensuring your Cummins receives uncompromised, air-free fuel volume down to the final drop.
Application Notes
- SureFlo performance sending units are designed for use in conjunction with an aftermarket externally mounted fuel pump OR as a replacement sending unit for trucks originally equipped without an in-tank low pressure lift pump.
- The SureFlo float arm will be in the opposite direction of the stock sending unit.
- For optimal performance, this product has been tested to work with aftermarket lift pumps including AirDog !!-5G with flow rates up to 220 GPH and Fass with flow rates up to 290 GPH.
The Fleece Performance SureFlo Performance Sending Unit (FPE−SF−CUMM−0304) offers a definitive remedy for the chronic fueling vulnerabilities plaguing modified 2003–2004 5.9L Cummins diesel engines. When upgrading to a high-flow, externally mounted aftermarket lift pump, enthusiasts are traditionally forced to alter their fuel tanks with suction tubes ("draw straws") or bottom-mount sumps. Both modifications introduce severe engineering liabilities, most notably the "quarter-tank issue." Under low-fuel conditions, sloshing uncovers the pickup point, causing the pump to draw air into the fuel system. This induction of air leads to pump cavitation—a destructive phenomenon where vapor bubbles collapse violently under pressure, eroding internal components, dropping fuel pressure, and potentially starving your engine under load.
The SureFlo engineered solution completely bypasses these plumbing vulnerabilities by utilizing an active fuel bucket assembly that integrates seamlessly into your factory tank configuration.
Zero Tank Modification: Drops directly into the stock sending unit location without requiring you to cut, drill, or permanently alter your f[...]
The Fleece Performance SureFlo Performance Sending Unit (FPE−SF−CUMM−0304) offers a definitive remedy for the chronic fueling vulnerabilities plaguing modified 2003–2004 5.9L Cummins diesel engines. When upgrading to a high-flow, externally mounted aftermarket lift pump, enthusiasts are traditionally forced to alter their fuel tanks with suction tubes ("draw straws") or bottom-mount sumps. Both modifications introduce severe engineering liabilities, most notably the "quarter-tank issue." Under low-fuel conditions, sloshing uncovers the pickup point, causing the pump to draw air into the fuel system. This induction of air leads to pump cavitation—a destructive phenomenon where vapor bubbles collapse violently under pressure, eroding internal components, dropping fuel pressure, and potentially starving your engine under load.
The SureFlo engineered solution completely bypasses these plumbing vulnerabilities by utilizing an active fuel bucket assembly that integrates seamlessly into your factory tank configuration.
- Zero Tank Modification: Drops directly into the stock sending unit location without requiring you to cut, drill, or permanently alter your fuel tank.
- Active Bucket Assembly: Utilizes dual-acting fuel dynamics by constantly drawing from and returning fuel directly to the base bucket, maintaining a flooded pickup and eliminating quarter-tank starvation.
- Integrated One-Way Check Valves: Engineered with submersed check valves at the base that allow fuel to freely flood the reservoir during low-level operation, keeping the pump fed even during hard acceleration or steep angles.
- Premium Material Construction: Features a robust, heavy-duty billet aluminum cap alongside a brand-new fuel level sender and float assembly to restore precise dashboard gauge accuracy.
- Versatile Plumbing Options: Outfitted with factory-style quick-disconnect fittings to adapt directly to stock fuel lines, alongside universal -8 AN ports for those plumbing high-volume custom fuel systems.
- Installation & Warranty Security: Includes a fresh tank O-ring or flange seal for a leak-free closure, backed by a 1-Year Limited Parts Warranty.
Beyond its utility as an upgrade for high-performance fuel pumps, this sending unit serves as a pristine mechanical replacement for trucks originally manufactured without an in-tank pump. Whether you are correcting a failed factory fuel level sensor or engineering a high-delivery custom fuel system from scratch, the SureFlo unit delivers the cleanest, most reliable plumbing architecture available. By maintaining continuous fuel submersion around the pickup point, you protect your aftermarket investment from dry-running damage while ensuring your Cummins receives uncompromised, air-free fuel volume down to the final drop.
Application Notes
- SureFlo performance sending units are designed for use in conjunction with an aftermarket externally mounted fuel pump OR as a replacement sending unit for trucks originally equipped without an in-tank low pressure lift pump.
- The SureFlo float arm will be in the opposite direction of the stock sending unit.
- For optimal performance, this product has been tested to work with aftermarket lift pumps including AirDog !!-5G with flow rates up to 220 GPH and Fass with flow rates up to 290 GPH.