CUMMINS 3942966 OEM FUEL RETURN LINE (CYLINDER HEAD TO TEE) – RAM 5.9L 24V (1998.5–2002)

Product Description

The Cummins 3942966 OEM Fuel Return Line is the factory-engineered line that connects the cylinder head to the return T-fitting on 1998.5–2002 Dodge Ram 5.9L 24V Cummins trucks. Built to precise Cummins specifications, this genuine component delivers OE sealing, proper fuel pressure bleed-off, and long-term reliability—critical for VP44-equipped engines where any return-side restriction can cause hard-starts, surging, or premature pump wear. If you are restoring a high-mileage truck or resolving a fuel smell or seep at the back of the head, this Cummins-engineered return line ensures an exact fit and leak-free performance.

FITMENT

• 1998.5–2002 Dodge Ram 2500 5.9L 24V Cummins
• 1998.5–2002 Dodge Ram 3500 5.9L 24V Cummins
• Direct replacement for VP44 fuel system trucks

CROSS-REFERENCE / RELATED CUMMINS PRODUCTS

• Cummins 3930913 Fuel Return Banjo Bolt
• Cummins 3944833 Return Line Tee Fitting
• Cummins 3949698 Return Line Washer Set

FAQ

Is this Cummins 3942966 line a genuine OEM component?

Yes — this is an authentic Cummins Genuine Part, not an aftermarket reproduction.

Will this line fix fuel odor or seepage at the rear of the cylinder head?

Yes, a worn or cracked return line is a common cause of fuel seepage and pressure bleed-off issues.

Does this line affect VP44 pump reliability?

A restricted or leaking return line can cause hard-starts and incorrect fuel pressure behavior, which can reduce VP44 lifespan.

Is any modification required to install this fuel return line?

No — it is a direct bolt-on replacement using factory routing and fittings.

Should I replace the banjo washers when installing this line?

Yes — Cummins recommends replacing return-side sealing washers to ensure a leak-free installation.

Specifications for cummins 3942966