Product Description

CUMMINS 3905353 OEM FUEL RETURN LINE TEE FITTING – RAM 5.9L 24V VP44 (1998.5–2002)

If your 1998.5–2002 5.9L 24V Cummins is weeping fuel at the back of the cylinder head or has a stubborn return leak, the Cummins 3905353 OEM fuel return line tee fitting is the genuine rear-of-head union you need. This male tee ties the injector/VP44 low-pressure return circuit together and is engineered by Cummins to restore proper return flow and long-term sealing on VP44-equipped ISB engines.

Engineered to OE spec, this genuine Cummins male union tee preserves the factory geometry of the return circuit, so your lines clock correctly and clamp down without stress or improvising fittings. Pair it with new grommets and return lines to eliminate messy leaks and keep your Ram 2500/3500’s fuel system clean and reliable.

Key Features & Benefits

• Genuine Cummins 3905353 male union tee – not a white-box copy.
• Correct rear-of-cylinder-head location for VP44 injector return on 5.9L 24V engines.
• Supports stable low-pressure fuel return to reduce aeration and hard-start complaints.
• OE-formed union ensures proper line routing and clamp alignment – no “universal” fittings.
• Designed for durability in high-heat, high-vibration diesel environments.

Verified Fitment

Automotive Applications (On-Highway)

• 1998.5–2002 Dodge Ram 2500/3500 with 5.9L ISB 24V Cummins (VP44)
• Position: Back of cylinder head, injector/VP44 fuel return tee fitting.

Industrial / Off-Highway (Reference)

• Selected 5.9L B-Series / ISB / QSB engines (non-certified and Tier 2 variants).
• Always confirm with your engine serial number (ESN) before ordering for industrial equipment.

How This Part Fits in the Return System

On VP44-equipped 5.9L Cummins engines, unused fuel from the injectors and the VP44 injection pump is routed back to the tank through a low-pressure return circuit. The 3905353 tee fitting is the union that:

• Receives return fuel from the cylinder head return line.
• Receives return fuel from the VP44 pump return line.
• Sends combined return flow toward the tank via the downstream drain/return tube.

Cross-Reference & Related Genuine Cummins Parts (CPP Diesel)

• CUMMINS 3905351 OEM FUEL RETURN LINE GROMMET SEAL – RAM 5.9L 24V (1998.5–2002) – three required per truck to seal the tee and related lines.
• CUMMINS 3945707 OEM FUEL DRAIN TUBE (VP44 RETURN LINE) – RAM 5.9L (1998.5–2002) – routes return from the VP44 pump to the tee.
• CUMMINS 3942966 OEM FUEL RETURN LINE (CYLINDER HEAD TO TEE) – RAM 5.9L 24V (1998.5–2002) – carries return fuel from the cylinder head to the tee.
• CUMMINS 3942592 OEM FUEL DRAIN TUBE / FUEL RETURN LINE (TO TANK) – RAM 5.9L 24V (1998.5–2002) – downstream return-to-tank line after the tee fitting.

What’s Included

• (1) Genuine Cummins 3905353 fuel return line tee fitting (male union tee).

Note: Return lines, grommet seals, and banjo sealing washers are sold separately. See related Cummins parts above to refresh the entire VP44 return circuit.

Installation Notes

• Work on a cool engine and relieve any residual fuel pressure before disconnecting lines.
• Inspect old lines and grommets for cracks or flattening; replace as needed to prevent new leaks.
• Install the tee in the factory orientation so the lines route cleanly without stress or kinks.
• Use new sealing hardware where applicable and torque fittings to the proper spec.
• After reassembly, prime the fuel system and check for seepage with the engine idling.

FAQ

WILL THIS FIT MY 1998.5–2002 24-VALVE CUMMINS RAM?

Yes. The Cummins 3905353 tee is used on VP44-equipped 5.9L ISB 24V engines in 1998.5–2002 Ram 2500/3500 trucks. If your fuel system has been modified, verify against your VIN/ESN before ordering.

WHERE DOES THIS TEE FITTING INSTALL?

It installs at the rear of the cylinder head, acting as the union for the injector/head return line, the VP44 pump return line, and the downstream return-to-tank line.

DOES THIS CUMMINS 3905353 TEE INCLUDE SEALS OR WASHERS?

No. This listing is for the metal tee fitting only. Pair it with fresh grommet seals ( Cummins 3905351) and new banjo sealing washers as needed.

WHAT OTHER RETURN LINES SHOULD I REPLACE AT THE SAME TIME?

For a complete refresh of the VP44 return circuit, most owners replace the head-to-tee line ( 3942966), the VP44-to-tee line ( 3945707), and the tee-to-tank line ( 3942592) along with new grommets and washers.

IS THIS A GENUINE CUMMINS PART?

Yes. CPP Diesel supplies genuine Cummins 3905353 tee fittings so you get OE materials, geometry, and durability instead of a generic brass or steel substitute.

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Specifications for cummins 3905353