1990-1994 FORD 6.9L/7.3L IDI INJECTOR RETURN LINE KIT - 73120
Keep your Ford IDI diesel running at its best with this Injector Return Line Kit designed for 1990–1994 6.9L & 7.3L IDI engines. Whether you're battling hard starts, fuel leaks, or looking to overhaul your aging return system, this kit provides everything needed to reseal and restore your injector return lines.
Built to OEM specifications and compatible with both F-Series trucks and E-Series vans equipped with non-turbo IDI engines, this kit includes heat- and diesel-resistant materials to withstand high underhood temps and the harshest operating conditions. With new return caps, fuel-safe hose, and Viton O-rings, it ensures a proper seal and steady return flow back to the tank.
This is the ideal solution for replacing dried-out caps and brittle lines — helping you maintain a consistent fuel system, reduce air intrusion, and keep your classic diesel alive for years to come.
KIT INCLUDES:
- 1 - Roll of Cloth Braided Return Line
- 8 - Plastic Return Line Fittings
- 8 - Copper Washers
- 16 - O-rings
- 16 - Return Line Clamps
Key Benefits:
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Prevents injector fuel leaks
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Eliminates air entry and hard starts
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Supports smoother cold starts
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OEM fitment ensures quick installation
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Withstands diesel fuel and engine heat
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Perfect for injector replacements or system refresh
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Reduces the risk of poor mileage or performance issues
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Designed for Ford IDI and E-Series platforms
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Cost-effective complete kit vs. sourcing parts separately
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Built for longevity with trusted material quality
Truck Compatibility / Applications:
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1990–1994 Ford F-250 / F-350 — 7.3L IDI Diesel
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1990–1994 Ford E-Series Vans (E-250, E-350) — 7.3L IDI
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1990 Ford F-Series — 6.9L IDI carryover models (verify engine)
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Fits non-turbo IDI applications only
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Not compatible with 7.3L Power Stroke or Turbo IDI models
The 73120 Injector Return Line Kit is built for 1990–1994 Ford 6.9L and 7.3L IDI diesel engines, offering a complete OE-style replacement for leaky or aged injector return systems. By eliminating air leaks and fuel seepage, this kit restores engine efficiency and drivability — ideal for rebuilds, restorations, or routine maintenance on classic diesel platforms.
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California Proposition 65 Warning:
This product may expose you to chemicals including carbon black, silica, and/or other petroleum-based compounds, which are known to the State of California to cause cancer or birth defects or other reproductive harm.
For more information, visit: www.P65Warnings.ca.gov
Note:
There are two different return cap designs used on these engines. The EARLY design has the return line in the center of the cap and uses 3/16th inch return lines. Generally, the early design was used form 1983 to mid 1991, while the late design was used from mid 1991 to 1994. However, if your engine was changed at some point, this may not be accurate, so it is best to visually see your lines and connectors to verify. This listing is for the late model
