Product Description
Cummins 3942592 — Fuel Drain Tube / Fuel Return Line (To Tank)
MPN: 3942592 | Also Known As: fuel return line, return-to-tank tube | Location: Tee fitting to quick-connect (rear of engine bay)
Why This Part
- ✓ OE-formed steel tube for leak-free, factory routing on VP44-era trucks.
- ✓ Direct-fit replacement—no cutting or bending required.
- ✓ Restores proper return-to-tank flow to protect the fuel system.
- ✓ Includes grommet & nut (per OE kit/retailer listing).
Quick Specs
| Type | Fuel drain / return line to tank |
|---|---|
| OE Part # | 3942592 |
| Routing | Tee fitting → quick-connect (return-to-tank) |
| Qty Required | 1 per vehicle (sold individually) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1998.5–2002 | 5.9L ISB (24V VP44) | Ram 2500/3500 |
Notes: Designed specifically for VP44-equipped 24-valve trucks (’98.5–’02). Verify by VIN/ESN if lines have been modified.
Often Paired With
- Fuel Return Line Tube: 3942966 (complimentary section)
- Return Line Tee Fitting: 3905353
- Fuel Return Line (From VP44): 3945707
- New clamps/seals if originals are corroded
What’s In The Box
- (1) Genuine Cummins Fuel Drain/Return Tube (3942592)
- Grommet & nut (per OE kit/retailer listing)
Install Tips
- Depressurize fuel system and work clean to avoid contamination.
- Route exactly as OE to avoid chafe points; replace any brittle clips.
- Prime system and check all connections for seepage after start-up.
FAQ
WILL THIS FIT MY 1998.5–2002 5.9L 24V CUMMINS RAM?Yes—this tube is designed for VP44-equipped 24-valve trucks (’98.5–’02) and follows factory routing from the tee to the return quick-connect.
IS THIS THE LINE THAT GOES FROM THE TEE FITTING TO THE TANK QUICK-CONNECT?Correct. This is the return-to-tank section; other adjacent sections and the tee fitting are available separately.
WHAT OTHER PARTS SHOULD I REPLACE AT THE SAME TIME?Common pairings include tube 3942966, tee fitting 3905353, and the VP44 return line 3945707. Replace any aged grommets/clips for a leak-free job.
IS THIS A GENUINE CUMMINS PART AND DOES IT INCLUDE HARDWARE?Yes—this is an OE Cummins tube. Many kits include the grommet and nut; check the package contents on your listing before checkout.
WILL THIS FIT 2003+ COMMON-RAIL TRUCKS?No—this line targets VP44 (’98.5–’02). Common-rail trucks use different hard lines and connections.
