Product Description
CUMMINS 3943767 OEM FUEL INJECTION LINE #2 – RAM 5.9L 24V (1998.5–2002)
Keep your VP44-fueled 5.9L Cummins happy with a genuine Cummins 3943767 #2 fuel injection line. This high-pressure injector fuel supply tube restores precise fuel delivery to cylinder #2, solving leaks, hairline cracks, and pressure loss that can cause hard starts, rough idle, and fuel haze. Unlike white-box copies, this OEM hard line is precision-bent for factory routing and sealing, so it drops into place with no guesswork.
Key Features
- Genuine Cummins 3943767 #2 injector fuel supply tube (high-pressure hard line).
- Direct-fit for 1998.5–2002 Ram 2500/3500 5.9L ISB 24V with VP44 injection pump.
- Correct length, bends, and flare geometry to match OEM routing and torque specs.
- Helps eliminate fuel leaks, pressure drop, and aeration caused by worn or cracked lines.
- Compatible with many Stage 2 ISB/QSB 5.9 industrial applications (verify by ESN).
- Perfect companion to the full OEM injector line set and Cummins connector tubes.
Fitment – Automotive
- Engine: 5.9L ISB 24V Cummins (VP44)
- Years: 1998.5, 1999, 2000, 2001, 2002
- Chassis: Dodge Ram 2500 / 3500
- Position: Cylinder #2 injector fuel supply tube (pump to injector)
Fitment – Industrial / Off-Highway (General)
Used on select Stage 2 ISB/QSB 5.9 engines in industrial, agricultural, and off-highway equipment. Always confirm by engine serial number (ESN) and parts catalog before ordering.
When To Replace Your #2 Injector Line
- Visible fuel weeping or wetness around line nuts or along the tube.
- Hard starts or rough idle after injector or VP44 replacement.
- Cracked or rusted OE line, especially near the flare or support clamp.
- Contamination event (metal, rust, or water) where the entire fuel path is being refreshed.
Cross-Reference & Companion Cummins Parts (CPP Diesel)
Pair this #2 line with the rest of the genuine Cummins injector lines and supporting hardware for a complete refresh:
- #1 Line – CUMMINS 3943765 OEM FUEL INJECTION LINE – CYLINDER #1 – RAM 5.9L 24V (1998.5–2002)
- #3 Line – CUMMINS 3943769 OEM #3 FUEL INJECTION LINE – RAM 5.9L (1998.5–2002)
- #4 Line – CUMMINS 3943771 OEM FUEL INJECTION LINE #4 – RAM 5.9L (1998.5–2002)
- #5 Line – CUMMINS 3943773 OEM #5 FUEL INJECTION LINE – RAM 5.9L 24V (1998.5–2002)
- #6 Line – CUMMINS 3943775 OEM #6 FUEL INJECTION LINE – RAM 5.9L (1998.5–2002) VP44
- Connector Tube – CUMMINS 3936953 OEM FUEL INJECTOR CONNECTOR TUBE – RAM 5.9L (1998.5–2002)
- Return Tee – CUMMINS 3905353 OEM FUEL RETURN LINE TEE FITTING – RAM 5.9L 24V VP44 (1998.5–2002)
- VP44 Return Tube – CUMMINS 3945707 OEM FUEL DRAIN TUBE (VP44 RETURN LINE) – RAM 5.9L (1998.5–2002)
- Line Bracket – CUMMINS 3946440 OEM FUEL LINE BRACKET / TUBE BRACE – RAM 5.9L (1998.5–2002)
What’s In The Box
- (1) Genuine Cummins #2 fuel injection line – part number 3943767
- Fittings and clamps reused or purchased separately
Installation Notes
- Route the line exactly like the original; do not force bends or twist the tube.
- Keep all connections extremely clean – cap open lines and injector inlets during service.
- Start all fittings by hand to avoid cross-threading, then torque to factory spec per service manual.
- After first warm-up and test drive, recheck for leaks at both the VP44 and injector ends.
Specifications for cummins 3943767
| UPC | Not specified by manufacturer / not published |
| Shipping Info | Approx. 0.55 lb ship weight; ships via standard ground service. Typical handling time 1–3 business days from CPP Diesel warehouse (subject to stock). |
| GTIN | Not specified / no global trade item number published |
| Cross Reference | Cummins 3943767 CUM, 3943767CUM; alternate OEM reference 703912AT (verify application by ESN/VIN). |
| E-codes | Not applicable – mechanical high-pressure fuel line (no calibration or emissions coding). |
| Prop 65 | WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov |
FAQ
WILL THIS FIT MY 1998.5–2002 5.9L 24V RAM?
Yes. This line is designed for 1998.5–2002 Dodge Ram 2500/3500 with the 5.9L ISB 24V Cummins and VP44 injection pump. It specifically serves cylinder #2. Always confirm you have a VP44 truck (not common-rail) before ordering.
WHICH CYLINDER AND PUMP IS THIS LINE FOR?
This is the cylinder #2 injector fuel supply tube. It connects from the VP44 high-pressure outlet to the #2 injector on 5.9L 24-valve Cummins engines in 1998.5–2002 Ram trucks.
IS THIS A GENUINE CUMMINS PART OR AFTERMARKET?
This is a genuine Cummins OEM 3943767 line, not a copy or white-box equivalent. You get factory-correct bends, flare geometry, and materials for reliable sealing and longevity.
SHOULD I REPLACE ALL SIX INJECTOR LINES AT ONCE?
It’s not mandatory, but it is best practice. If one line has cracked or corroded, the others are likely in similar condition. Replacing all six at the same time reduces repeat labor, helps stabilize rail pressure, and gives you a fresh baseline for diagnostics.
DOES THIS LINE INCLUDE CONNECTOR TUBES OR CLAMPS?
No. This listing is for the 3943767 hard line only. Connector tubes, clamps, and brackets are sold separately. For a thorough refresh, pair this with Cummins 3936953 connector tubes, Cummins 3946440 line bracket, and the other five injector lines.
WILL THIS WORK ON COMMON-RAIL (2003+) ENGINES?
No. This part is for VP44-equipped 5.9L 24V engines (1998.5–2002) only. Common-rail 5.9L (2003–2007) and 6.7L Cummins engines use different style high-pressure lines and rails.
