FLEECE FPE-34197 6.7L CUMMINS FUEL RAIL FITTING ADAPTER 14MMX1.5 TO 18MMX1.5 3.5MM ID

Dial in your fuel system with the FLEECE FPE-34197—a precision fuel rail fitting adapter that converts 14mm x 1.5 to 18mm x 1.5 with a 3.5mm ID. Perfect for clean, leak-free connections on 6.7L Cummins builds, dual-pump setups, or service work where thread conversion is required. Fleece FPE-34197, 6.7L Cummins fuel rail adapter, 14mmx1.5 to 18mmx1.5, 3.5mm ID, fuel rail fitting, Cummins rail hardware, CPP Diesel, Fleece Performance Engineering

Benefits

• Converts rail/line threads for trouble-free plumbing
• 3.5mm internal diameter supports strong fuel flow
• OE-grade sealing and fit for reliable installs
• Ideal with Fleece fuel distribution and CP3 hardware

Fitment

Engine: 6.7L Cummins (applications requiring conversion from M14x1.5 rail to M18x1.5 line).
Use Cases: Fuel rail service, conversions, dual-pump kits, and custom fuel system plumbing where a clean thread transition is needed.

Cross-Reference / Related Fleece Items (CPP Diesel)

• FLEECE FPE-34196 – Dual Pump Kit Junction Block w/ Rail Sensor Port (3.5mm ID)
• FLEECE FPE-CUMM-CP3-FL-ADPT-KIT – HP Fuel Line Adaptation Kit (5.9L to 6.7L CP3)
• FLEECE FPE-CUMM-SSFTN – Stainless Steel Fuel Supply Tube Nuts (5.9/6.7L Cummins)
• FLEECE FPE-FFD-RF-3G-67 – 3rd Gen 6.7L Fuel Distribution Block (2007.5–2009)
• FLEECE FPE-FL-CUMM-6.7-SET – Fuel Injection Line Set (07.5–18)

It adapts 14mm x 1.5 (rail) to 18mm x 1.5 (line) with a 3.5mm internal diameter.

No. This fitting simply converts thread sizes—no tuning or ECM calibration is required.

Use appropriate fuel-safe sealing methods per OEM/Fleece guidance. Do not over-torque. Always verify leak-free operation upon startup.

The 3.5mm ID is designed to maintain proper flow in typical 6.7L Cummins applications.

Specifications for FLEECE FPE-34197