Product Description
Genuine Cummins
Cummins 3943771 — Fuel Injection Line #4 (High-Pressure Hard Line) for 5.9L 24V
MPN: 3943771 | Also Known As: injector line, high-pressure fuel line | Application: VP44-equipped 5.9L 24-valve
Why This Part
- ✓ OE bends & fittings for proper sealing and routing on cylinder #4.
- ✓ Direct-fit for 1998.5–2002 Ram 5.9L 24V (VP44)—no modifications needed.
- ✓ Helps prevent fuel leaks & aeration from cracked or fatigued lines.
- ✓ Genuine Cummins quality for durability under heat and vibration.
OE Fit Stock Replacement 1 Per Cylinder
Quick Specs
| Type | High-pressure fuel injection hard line |
|---|---|
| OE Part # | 3943771 |
| Cylinder Position | #4 |
| Fitment Generation | 5.9L ISB 24V (VP44) |
| Qty Required | 1 per cylinder (sold individually) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1998.5–2002 | Ram 5.9L ISB 24V (VP44) | Ram 2500/3500 |
Notes: This is the #4 line. Other cylinders use different part numbers—see “Often Paired With.” Always verify by VIN/ESN.
Often Paired With
- Other Injector Lines (’98.5–’02 5.9L): #1 3943765, #2 3943767, #3 3943769, #5 3943773, #6 3943775
- Line clamps & retainers: inspect and replace if fatigued
- Clean-room practices: cap open fittings to prevent contamination
What’s In The Box
- (1) Genuine Cummins High-Pressure Fuel Injection Line — Cylinder #4 (3943771)
Install Tips
- Relieve fuel pressure and work on a clean, cool engine.
- Hand-start nuts to avoid cross-threading; do not bend the line.
- Tighten to factory torque spec; recheck for leaks after prime and warm-up.
FAQ
WILL THIS FIT MY 1998.5–2002 5.9L CUMMINS RAM?Yes—this OE line fits VP44-equipped 5.9L 24V Ram 2500/3500 (1998.5–2002). Verify by VIN/ESN if unsure.
WHICH CYLINDER DOES 3943771 SERVE?It’s the high-pressure line for cylinder #4.
CAN I REPLACE JUST ONE LINE?Yes, but inspect all lines and clamps for fatigue. If multiple lines show wear or corrosion, consider replacing the set.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3943771 with correct bends, flare geometry, and fittings.
WHAT ARE THE OTHER CYLINDER PART NUMBERS?#1 3943765, #2 3943767, #3 3943769, #5 3943773, #6 3943775.
Product Videos
Custom Field
Vehicle Year 1998.5,1999,2000,2001,2002
Vehicle Make DODGE
ENGINE 5.9L
