Fleece Performance 03-04 Dodge Cummins Fuel System Upgrade Kit w/ PowerFlo Lift Pump
The engine-mounted lift pump on a 2003 to early 2004 Dodge Ram 2500 or 3500 with the 5.9L common rail Cummins is a known weak point, and when it fades the CP3 injection pump starts running short of fuel. If your truck is cranking long, falling flat under load, setting low fuel pressure codes or the fuel gauge has stopped reading, the Fleece Performance FPE-34755 kit replaces the whole supply side at once: a new in-tank PowerFlo lift pump with its own fuel level sender, a frame-mounted Donaldson filter base, and the hose and fittings to tie it together.
The CP3 builds rail pressure, but it is designed to be fed a steady supply, not to draw fuel the length of the truck. The lift pump pushes diesel from the tank through the filter to the CP3 inlet. On these early common rail trucks the factory pump lived on the engine, far from the tank, so it had to pull fuel the whole length of the frame. Many trucks later got a dealer in-tank retrofit. The PowerFlo moves the pump into the tank and uses two gerotor pump sections instead of one. Fleece rates it to support up to 800 HP, including dual CP3 setups, and lists operating pressure at 15-17 psi at idle. An active fill bucket keeps the pickup full, so you avoid the starving at a quarter tank that some high flow pumps suffer from.
Put a gauge on the supply side ahead of the CP3 and watch it at idle and under load. Pressure that drops toward zero when you lean on the throttle points to the lift pump or a plugged filter. Change the filter first and recheck. Rule out the transmission too: a 48RE that slips or drops out of lockup can feel like a loss of power. Our 48RE Cummins transmission problems guide covers how to tell the difference.
Fleece lists FPE-34755 for 2003 to 2004.5 Dodge Ram Cummins, including 2004 trucks that already have a dealer in-tank retrofit. The kit is built for tanks that use the plastic locking cap. Trucks from the 2005 model year use a metal locking ring with an alignment tab on the pump cap and need a different kit. Look at your tank cap before ordering, and if your truck is a late 2004 build, send us the year and VIN so we can confirm. Shop more parts for these trucks on our 48RE parts page or the engine and fuel parts category.
Pair this kit with a healthy CP3 such as the Fleece CP3K for the 5.9 if you are building power, and read our 48RE towing upgrades before you add fuel.
| Brand | Fleece Performance |
| Part number | FPE-34755 |
| Fits | Fleece Performance 03-04 Dodge Cummins Fuel System Upgrade Kit w/ PowerFlo Lift Pump |
| Vehicle fitment | Dodge Cummins Fuel System Upgrade (2003-2004) |
| Type | Fuel Pump Hangers |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. Fleece builds FPE-34755 for 2003 to 2004.5 trucks with the plastic tank locking cap. 2005 and newer tanks use a metal locking ring with an alignment tab and need a different PowerFlo kit.
Yes. Fleece states that trucks with a factory or dealer retrofitted in-tank pump use this same part number, FPE-34755.
The PowerFlo has an integral fuel level sender with a new float, so a gauge that stopped working because of the old sender should read again after install.
The kit comes with a Donaldson filter and water separator on a frame-mounted base. Fleece lists Donaldson P553203 as the replacement filter for FPE-34755.
Fleece lists 15-17 psi at idle for this kit. Check it with a gauge ahead of the CP3 after priming.
Fleece does not call for a tune for this kit. It replaces the factory supply system and works with stock or upgraded injection setups up to its rated 800 HP.
