Product Description
Cummins 3909696 — Fuel Injector Return Manifold / Return Line
MPN: 3909696 | Also Known As: fuel return manifold, injector return line | Related/Cross-Refs (identification): 3913930
Why This Part
- ✓ OE-formed hard line that returns excess fuel from the injectors back to the system.
- ✓ Direct-fit for 1989–1993 5.9L Cummins 12-valve (1st Gen).
- ✓ Pre-bent manifold helps prevent leaks vs. pieced-together hose fixes.
- ✓ Durable OE material to resist vibration and cracking.
Quick Specs
| Type | Fuel injector return manifold / return line |
|---|---|
| OE Part # | 3909696 (alt ID: 3913930) |
| Qty Required | 1 per engine (sold individually) |
| Includes | Return manifold only; banjo bolts & sealing washers sold separately |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–1993 | 5.9L Cummins 12V (6BT, VE pump) | Dodge/Ram 2500 & 3500 (1st Gen) |
Industrial/Off-Highway: Used primarily on non-certified 5.9L B-Series; also seen on some 4B/6B applications—verify by ESN.
Often Paired With
- Banjo Bolts (injector return): Cummins 3905307 (qty 6)
- Sealing Washers: Mopar 4429380 (banjo/crush washers), plus size-specific 8mm/12mm seals as required
- Return check valve & fittings if corroded
What’s In The Box
- (1) Genuine Cummins Fuel Injector Return Manifold (3909696)
- Bolts/washers sold separately (see “Often Paired With”).
Install Tips
- Old manifolds often crack during removal—inspect carefully and replace washers/bolts.
- Seat each banjo washer correctly; torque per factory spec and recheck for leaks after warm-up.
- If lines were contaminated, flush the fuel system before startup.
FAQ
WILL THIS FIT MY 1989–1993 5.9L CUMMINS?Yes—this is the OE injector return manifold for 1989–1993 5.9L Cummins 12-valve (verify by VIN/ESN).
DOES THIS INCLUDE BANJO BOLTS AND WASHERS?No—order bolts (Cummins 3905307, qty 6) and new sealing washers (e.g., Mopar 4429380) separately for a leak-free install.
WHAT’S THE DIFFERENCE VS. HOSE KITS?The OE pre-bent hard manifold resists heat/vibration and maintains proper alignment at the injectors, reducing leak points.
IS THIS AN OEM CUMMINS PART?Yes—genuine Cummins 3909696.
WILL THIS WORK ON 1994–1998 TRUCKS?No—94–98 trucks use a different return line setup. Use the application-specific part for those years.
Product Videos
Custom Field
Product Reviews
4 Reviews Hide Reviews Show Reviews
-
93 cummins return line
quick response. CPP has everything I need for restoring my old dodge.
-
93 cummins return line
quick response. CPP has everything I need for restoring my old dodge.
-
Cummins injector return line
Quick response. Carefully packaged. CPP has everything I need to restore my '93 dodge cummins!
-
Cummins injector return line
Quick response. Carefully packaged. CPP has everything I need to restore my '93 dodge cummins!
