Product Description
CUMMINS 3925860 OEM FUEL INJECTION PUMP RETURN LINE (FUEL DRAIN TUBE)
The CUMMINS 3925860 is the genuine OEM fuel injection pump return line (fuel drain tube) designed for a perfect fit and leak-free fuel return flow on 1991.5–1993 5.9L 12-valve (VE rotary injection pump) engines used in Dodge pickups. It is formed from OE-grade steel and built to meet Cummins durability standards. This return line routes from the VE injection pump along the tappet cover to the rear block “T” and ensures proper routing and secure fuel drainage. Includes nut & grommet seal for installation; requires two 12 mm sealing washers (part 3963983), sold separately.
Fitment:
• 1991.5–1993 5.9L 12-Valve Cummins (VE rotary injection pump)
• Dodge D/W 250 & 350 (1st Gen) pickups — verify ESN before ordering.
Includes: Fuel injection pump return line (3925860), nut & grommet seal.
Note: Sealing washers (two 3963983) are required for proper installation — sold separately.
Why Choose This Part:
• OE-formed steel for long life and leak-free operation
• Direct bolt-on replacement — no modifications required
• Maintains factory fuel return flow and system integrity
• Gasketed seal plus proper hardware — minimizes risk of leaks or fuel return issues
FAQ WILL THIS FIT MY 1991.5–1993 5.9L 12-VALVE CUMMINS?
Yes — this is the correct OEM return line for VE-pump 5.9L 12-valve engines for those model years.
IS THIS THE LINE FROM THE VE PUMP TO THE “T” AT THE BACK OF THE BLOCK?
Yes — this line routes from the injection pump to the rear block “T,” following the factory route along the tappet cover.
DOES IT INCLUDE HARDWARE?
It includes the nut and grommet seal. However — you must supply two 12 mm sealing washers (part 3963983), which are sold separately.
IS THIS A GENUINE CUMMINS PART?
Yes — this is the OEM part (3925860, superseding 3920888) as supplied by Cummins.
WILL THIS WORK ON 1994–1998 P-PUMP OR 24-VALVE TRUCKS?
No — this return line is specific to VE-pump 1991.5–1993 trucks. Later P-pump (’94–’98) or 24-valve engines use different routing and part numbers.
| Specifications for CUMMINS 3925860 | |
|---|---|
| Part Number (MPN) | 3925860 (supersedes 3920888) |
| UPC | — |
| GTIN | — |
| Shipping Weight / Dimensions | ~0.26 lb — 21.0″ L × 6.0″ W × 3.625″ H |
| Includes | Return line, nut & grommet seal (washers sold separately) |
| Cross Reference | 3920888 (old number) — sealing washers: 3963983 (require 2) |
| E-Codes / Compliance | N/A |
| Prop 65 Warning | Not applicable |
| Qty Required | 1 per engine |
