Product Description
Genuine Cummins
Cummins 3866798 — Injector Fuel Supply Line Set (P7100 Layout), Set of 6
MPN: 3866798 | Also Known As: injector lines, high-pressure fuel lines (set) | Pump Type: Bosch P7100
Why This Part
- ✓ OE-bent hardlines for correct routing, clamp locations, and leak-free sealing.
- ✓ Direct-fit for 1994–1998 5.9L 12-valve with Bosch P7100 injection pump.
- ✓ Restores factory fuel delivery and injection timing stability.
- ✓ Genuine Cummins metallurgy and flare profiles for durability.
OE Fit P7100 Only Set of 6
Quick Specs
| Type | High-pressure injector fuel supply line set |
|---|---|
| OE Part # | 3866798 |
| Included | 6 lines (#1–#6), P7100 layout; clamps/hardware as shown if equipped |
| Material | Precision-formed steel hardlines |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1994–1998 | 5.9L 12-Valve 6BT (Bosch P7100) | Dodge Ram 2500/3500 |
Industrial/Marine: Also used on select Cummins C/6CTA 8.3 P7100 applications; verify by ESN and pump type before ordering.
Often Paired With
- Injector Line Clamp Kit & Brackets (replace brittle or missing hardware)
- New injectors or sealing washers as required
- Lift pump/filter service to protect the P-pump and injectors
What’s In The Box
- (1) Genuine Cummins Injector Fuel Supply Line Set (6 lines), P7100 layout — 3866798
- Clamps/fasteners not always included; see photos/notes on your listing
Install Tips
- Work scrupulously clean; do not kink or re-bend lines. Start all fittings by hand.
- Route through factory clamps; torque per service manual. Recheck after first heat cycle.
- Prime and leak-check; any seep at a flare requires re-seating, not additional torque.
FAQ
WILL THIS FIT MY 1994–1998 12-VALVE RAM?Yes—this set matches the 5.9L 12-valve with the Bosch P7100 (P-pump). It is not for VP44 (’98.5–’02) or common-rail (’03+).
IS THIS A SET OF SIX LINES?Yes—six high-pressure lines (#1–#6) arranged for the P7100 pump and 12-valve cylinder layout.
ARE CLAMPS AND BRACKETS INCLUDED?Clamps may vary by batch; plan to reuse your OEM clamps or add a clamp kit for best results.
WILL THIS FIT 24-VALVE VP44 OR 5.9/6.7 COMMON-RAIL?No—those engines use different line sets (and rails on common-rail). This kit is for P7100 only.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3866798 with factory bends and flare geometry for proper sealing.
