Product Description
Cummins 3943767 — High-Pressure Fuel Injection Line (Cylinder #2)
MPN: 3943767 | Also Known As: injector fuel supply tube, high-pressure injection line | Platform: 5.9L 24-valve ISB (VP44)
Why This Part
- ✓ OE pre-bent geometry for precise routing and leak-free seating.
- ✓ Direct-fit replacement for Cylinder #2 on 1998.5–2002 5.9L 24V.
- ✓ Hardened flare seats and durable corrosion-resistant tubing.
- ✓ Restores factory high-pressure fuel delivery after cracks or vibration fatigue.
Quick Specs
| Type | Injector fuel supply tube / high-pressure line |
|---|---|
| OE Part # | 3943767 (Cylinder #2) |
| Engine | 5.9L ISB 24V (VP44 pump), 1998.5–2002 |
| Qty Required | 1 per cylinder position (6 total lines on engine) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1998.5–2002 | Ram 5.9L ISB 24V (VP44) | Ram 2500/3500 |
Industrial/Off-Highway: Also used on Stage 2 ISB/QSB 5.9 applications—verify by Engine Serial Number (ESN) before ordering.
Often Paired With
- Other lines: #1 (3943765), #3 (3943769), #4 (3943771), #5 (3943773), #6 (3943775)
- Line clamps/isolators if vibration wear is present
- Injector sealing hardware as needed (follow OE service procedures)
What’s In The Box
- (1) Genuine Cummins High-Pressure Injection Line — Cylinder #2 (3943767)
- Associated clamps/hardware sold separately.
Install Tips
- Cleanliness is critical: cap open fittings; keep debris out.
- Do not bend the hard line; misalignment can cause leaks.
- Start flare nuts by hand to avoid cross-threading; torque to factory spec per service manual.
- Prime fuel system and check for leaks after install.
FAQ
WILL THIS FIT MY 1998.5–2002 24-VALVE 5.9L CUMMINS?Yes—this OE line fits Cylinder #2 on 1998.5–2002 5.9L 24V (VP44) Ram 2500/3500. Verify by VIN/ESN if components have been changed.
WHICH CYLINDER IS THIS LINE FOR?3943767 is the high-pressure line for Cylinder #2. Other cylinders use their own part numbers.
SHOULD I REPLACE ALL LINES AT ONCE?Not required, but it’s common to replace any cracked or corroded lines as a set to prevent future failures and ensure consistent seating.
WHAT TORQUE SHOULD I USE?Follow the factory service manual torque for VP44 injection lines. Over- or under-torque can cause leaks or seat damage.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3943767 with correct flare design and routing.
