FLEECE FPE-34755 FUEL SYSTEM UPGRADE KIT WITH POWERFLO LIFT PUMP FOR 03-04 DODGE CUMMINS

Only from Fleece Performance Engineering, the FPE-34755 Fuel System Upgrade Kit with PowerFlo Lift Pump is a complete, in-tank fuel supply upgrade for your 2003–2004 Dodge Ram 2500/3500 5.9L Cummins. This kit includes everything you need to properly route, plumb, pump, and filter fuel, replacing dated frame-mounted lift pumps, solving quarter-tank starvation issues, and delivering the fuel volume your build needs.

At the heart of the kit is the PowerFlo in-tank lift pump, featuring dual OE-quality gerotor pumps capable of supporting up to 800+ rear-wheel horsepower. The active fill bucket design eliminates the need for tank sumps or draw straws and keeps the pickup fully supplied, even with low fuel levels. A Donaldson 3-micron fuel filter and water separator takes care of fine filtration, while a Fleece fuel filter delete and distribution block streamline the underhood plumbing and reduce restriction.

This kit installs using the factory tank opening and connections—no cutting big holes in the tank and no noisy external pump brackets. Operating pressure is maintained at approximately 15–17 psi at idle, and the system is validated for use with up to 20% biodiesel, giving you OEM-level drivability with serious performance headroom.

FEATURES & BENEFITS

• Complete fuel system upgrade kit for 2003–2004 Dodge Ram 2500/3500 5.9L 24V Cummins.
• In-tank PowerFlo lift pump with dual gerotor design supports up to 800+ RWHP.
• Includes new fuel level sending unit and float to restore accurate fuel gauge operation.
• Eliminates common quarter-tank fueling and starvation issues with active fill bucket technology.
• Uses the factory tank opening—no cutting or drilling the fuel tank required.
• Donaldson 3-micron fuel filter and water separator for high-efficiency filtration.
• Includes Fleece fuel filter delete and distribution block to simplify engine bay plumbing.
• Operating pressure: approximately 15–17 psi at idle.
• Validated for up to B20 biodiesel use.
• Backed by Fleece’s limited lifetime warranty on the PowerFlo pump (per manufacturer).

FITMENT

This Fleece FPE-34755 kit is designed specifically for:

• 2003 Dodge Ram 2500 5.9L 24V Cummins (with OEM-style in-tank pump configuration)
• 2003 Dodge Ram 3500 5.9L 24V Cummins
• 2004 Dodge Ram 2500 5.9L 24V Cummins
• 2004 Dodge Ram 3500 5.9L 24V Cummins
• Model year 2003–2004.5 trucks using the plastic tank locking cap (no metal locking ring).
• Trucks with a factory or dealer retrofitted in-tank pump that use the earlier plastic-locking-cap tank style.

Tank Note: 2003–2004.5 Ram trucks use a plastic locking cap on the fuel pump module. 2005+ tanks use a metal locking ring and alignment tab and require a different PowerFlo assembly. Always verify your tank style before ordering.

WHAT'S INCLUDED

The FPE-34755 Fuel System Upgrade Kit includes:

• Fleece PowerFlo in-tank lift pump with integral fuel sender and float.
• Donaldson 3-micron fuel filter and water separator (Donaldson P/N P553207 or equivalent).
• Filter base with integral mounting bracket.
• Distribution filter block / filter coupler.
• Fleece fuel filter delete (FPE-FFD-RO-3G).
• Push-lock hose and all required AN and barb fittings.
• Mounting hardware and installation components as supplied by Fleece.

RECOMMENDED FLEECE UPGRADES (CROSS-REFERENCE)

Build a complete, high-flow, serviceable fuel system on your Cummins with these related Fleece components available at CPP Diesel:

• FLEECE FPE-34783 2003-2018 DODGE CUMMINS AUXILIARY FUEL FILTER KIT – Adds post-lift-pump filtration between the lift pump and CP3 for 5.9L/6.7L Cummins.
• FLEECE FPE-FFD-RO-3G 2003-2007 DODGE/CUMMINS FUEL FILTER DELETE – Required when using the auxiliary fuel filter kit and ideal with the FPE-34755 upgrade.
• FLEECE FPE-FH-CUMM-GM FUEL HEATER FOR GM/CUMMINS FILTER BASES – Optional fuel heater that integrates with Fleece filter bases (including kits using FPE-34755).
• FLEECE FPE-CUMM-CP3-10MM-5.9 POWERFLO 750 CP3 – Great CP3 upgrade for 5.9L Cummins builds up to ~750 RWHP when paired with the PowerFlo lift pump.
• FLEECE FPE-CUMM-CP3-12MM-5.9 POWERFLO 1000 CP3 – For more aggressive 5.9L Cummins builds targeting 800+ RWHP with proper supporting mods.

INSTALLATION NOTES

• Estimated installation time: approximately 3–4 hours with a vehicle hoist or lift.
• Installs through the factory tank opening—no need to drill or cut the fuel tank.
• Designed for use with the included Donaldson filter and Fleece filter delete components.
• Operating pressure: ~15–17 psi at idle (per Fleece specifications).
• Validated for up to B20 biodiesel (20% blend) use.

FAQ

The Fleece PowerFlo in-tank lift pump in this kit uses dual gerotor pumps and is rated to support approximately 800+ rear-wheel horsepower in a properly configured fuel system. That makes it an excellent choice for tuned and modified 5.9L Cummins trucks that have upgraded injectors and CP3 pumps.

No. The PowerFlo is designed as an OEM-replacement in-tank lift pump that takes the place of noisy, external frame-mounted pumps and the associated plumbing. It uses the factory tank opening and connections while delivering significantly higher flow than the stock setup.

Yes. The PowerFlo module uses an active fill bucket design that keeps the pump supplied with fuel and eliminates the quarter-tank starvation issues common to many aftermarket external lift pump setups that rely on draw straws or poorly designed sumps.

The lift pump assembly is validated for use with up to B20 biodiesel (20% biodiesel blend). Always follow Fleece’s guidelines for fuel quality and vehicle storage, especially in cold climates where fuel gelling can occur.

In most cases, no additional tuning is required just for the lift pump and filtration upgrade. However, if you are also installing larger injectors, CP3 upgrades, or aggressive performance tuning, you should work with a qualified tuner so the entire fuel system and powertrain are calibrated correctly.

Specifications for FLEECE FPE-34755