The Driven Diesel DD-73FS-TKF-V4 is a comprehensive in-tank and pre-pump fuel modification kit (commonly called the "Hutch Mod" and "Harpoon Mod") engineered for 1999–2003 7.3 Powerstroke trucks and Excursions. It upgrades the suction side of the fuel system from the tank sending unit up to the inlet of the frame-mounted electric lift pump. Driven Diesel packages this fourth-generation kit with a CNC-bent 3/8" rigid stainless steel suction tube, a custom Baldwin spin-on water separator/fuel filter base with a mounting bracket, a Baldwin spin-on filter, 3/8" Gates high-grade diesel fuel hose, stainless hose clamps, and brass adapter fittings.

Noisy fuel pump whine, aerated fuel damaging injector barrels, erratic fuel pressure under load, and starvation below 1/4 tank of fuel are what this kit solves. The factory fuel sending unit uses fragile plastic "duckbill" valves and microscopic mixing chamber screens that disintegrate or plug over time, while the factory push-connect fittings on the suction side pull air into the fuel stream under negative pressure. By replacing the in-tank pickup with a solid stainless tube, relocating primary filtration out to a serviceable frame-mounted Baldwin spin-on filter, and replacing failure-prone quick-connects with continuous rubber hose, the pump receives pure, air-free fuel. It is the complete in-tank and pre-pump filter plumbing kit only; the electric lift pump and fuel sending unit level sensor are not included.

It fits 1999–2003 7.3 Powerstroke Super Duty pickup trucks and Excursions; it does not fit cab-and-chassis models with aft-axle tanks without custom hose routing, nor does it fit E-Series vans.

Fitment

• 1999–2003 Ford F-250 Super Duty 7.3L Powerstroke
• 1999–2003 Ford F-350 Super Duty 7.3L Powerstroke
• 1999–2003 Ford F-450 / F-550 Super Duty 7.3L Powerstroke (side/front tanks only)
• 2000–2003 Ford Excursion 7.3L Powerstroke
• Does NOT fit Ford E-Series Vans
• Eliminates in-tank mixing chamber and problematic quick-connect suction fittings
• Cures "1/4 tank" fuel starvation and suction-side air aeration
• Includes custom pre-pump Baldwin spin-on filter base, bracket, and element
• Complete pre-pump and tank upgrade kit only

Drop the fuel tank or unbolt the pickup bed to gain clear access to the fuel tank sending unit collar. Thoroughly clean the top of the fuel tank before loosening the lock ring to prevent dirt from falling inside the open tank. When modifying the internal sending unit assembly, flare or bead the cut metal tubes properly as directed and ensure the new stainless suction tube sits approximately 1/8" to 1/4" off the bottom of the tank floor. Pre-fill the new pre-pump spin-on filter with clean diesel fuel before final mounting to minimize the amount of air the lift pump needs to purge during the initial key cycles.