Product Description
CUMMINS 3943765 OEM FUEL INJECTION LINE – CYLINDER #1 – RAM 5.9L 24V (1998.5–2002)
The Cummins 3943765 OEM #1 fuel injection line is the direct-fit, high-pressure tube that connects your VP44 injection pump to the #1 cylinder injector on 1998.5–2002 Dodge Ram 5.9L 24-valve Cummins trucks. Built to Cummins OE specs with the correct bends, flare geometry, and wall thickness, this genuine line restores safe, leak-free fuel delivery on ISB VP44 applications.
Why Choose Genuine Cummins 3943765 from CPP Diesel?
- OE-formed high-pressure fuel injection line from VP44 pump to #1 injector.
- Correct length, bends, and flare geometry to minimize stress, vibration, and leaks.
- Designed specifically for 1998.5–2002 Ram 2500/3500 5.9L 24V Cummins (VP44).
- Genuine Cummins quality for long service life and consistent injection timing.
- Ships fast from CPP Diesel with free shipping on qualifying orders.
Fitment Details
Engine: Cummins ISB 5.9L 24-Valve with VP44 injection pump
Truck: Dodge Ram 2500 / 3500 (including cab & chassis where equipped)
Model Years: 1998.5, 1999, 2000, 2001, 2002
Cylinder: #1 (front cylinder, VP44 to injector)
| Year | Make | Model | Engine |
|---|---|---|---|
| 1998.5–2002 | Dodge | Ram 2500 | 5.9L ISB 24V (VP44) |
| 1998.5–2002 | Dodge | Ram 3500 | 5.9L ISB 24V (VP44) |
Always verify fitment by VIN or engine serial number (ESN) before ordering.
Cross-Reference & Matching Cummins Lines
This listing is for the #1 cylinder line (3943765) only. Matching genuine Cummins lines and related fuel plumbing for 98.5–02 VP44 trucks are available at CPP Diesel:
- #2 Cylinder Line – Cummins 3943767: CUMMINS 3943767 OEM FUEL INJECTION LINE #2 – RAM 5.9L 24V (1998.5–2002)
- #3 Cylinder Line – Cummins 3943769: CUMMINS 3943769 OEM #3 FUEL INJECTION LINE – RAM 5.9L (1998.5–2002)
- #4 Cylinder Line – Cummins 3943771: CUMMINS 3943771 OEM FUEL INJECTION LINE #4 – RAM 5.9L (1998.5–2002)
- #5 Cylinder Line – Cummins 3943773: CUMMINS 3943773 OEM #5 FUEL INJECTION LINE – RAM 5.9L 24V (1998.5–2002)
- Fuel Return Line, Cylinder Head to Tee – Cummins 3942966: CUMMINS 3942966 OEM FUEL RETURN LINE (CYLINDER HEAD TO TEE) – RAM 5.9L 24V (1998.5–2002)
For a complete refresh of the VP44 fuel injection lines, pair this #1 tube with the matching #2–#6 Cummins lines listed above.
What’s Included
- (1) Genuine Cummins high-pressure injection line – Cylinder #1 (Part #3943765)
Clamps, hardware, and other cylinder lines are sold separately.
Installation Notes
- Route the line exactly as the OE tube; do not twist, kink, or re-bend.
- Clean all sealing surfaces before installation and protect open connections from dirt.
- Start fittings by hand to avoid cross-threading, then torque to the factory spec.
- After initial start-up, check for leaks and re-torque as required.
Specifications for cummins 3943765
| Brand | Cummins (Genuine OEM) |
| Part Number | 3943765 |
| Product Type | High-pressure fuel injection line (VP44 pump to #1 injector) |
| Engine Platform | ISB 5.9L 24-Valve Cummins with VP44 injection pump |
| Vehicle Applications | 1998.5–2002 Dodge Ram 2500/3500 5.9L 24V Cummins |
| GTIN / EAN | 9415829244923 (reference GTIN used in aftermarket catalog data) |
| UPC | Not specified by manufacturer |
| Cross Reference | Cummins 3943765; often sold with line set including 3943767, 3943769, 3943771, 3943773, 3943775 |
| E-Codes / Emissions | Not specified; OE replacement fuel line for on-road light-duty applications |
| Shipping Weight | Approx. 0.55 lb (line only) |
| Package Dimensions | Approx. 8.00" (W) × 1.00" (H) × 10.00" (L) |
| Shipping Info | Ships from CPP Diesel; typically 1–3 business days handling; free shipping on qualifying orders. |
| Country of Origin | US (per common Cummins catalog data; exact COO may vary by batch) |
| Prop 65 | WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov |
FAQ
WILL THIS LINE FIT MY 1998.5–2002 DODGE RAM 5.9L 24-VALVE?Yes. This Cummins 3943765 line is the OE #1 cylinder high-pressure tube for 1998.5–2002 Ram 2500/3500 trucks equipped with the 5.9L ISB 24V Cummins and VP44 injection pump. Always verify by VIN/ESN for fleet or mixed-engine trucks.
IS THIS THE LINE FROM THE VP44 PUMP TO THE #1 INJECTOR?
Correct. 3943765 is the formed high-pressure line that connects the VP44 injection pump outlet to the #1 cylinder injector on ISB 5.9L 24V engines.
WHAT ARE THE MATCHING CUMMINS PART NUMBERS FOR THE OTHER CYLINDERS?
The typical VP44 5.9L 24V line set uses: #1: 3943765, #2: 3943767, #3: 3943769, #4: 3943771, #5: 3943773, and #6: 3943775. CPP Diesel stocks the genuine Cummins lines listed above so you can replace one cylinder or the complete set.
CAN I RE-BEND OR STRAIGHTEN A CRACKED OR LEAKING INJECTION LINE?
Re-bending is not recommended. High-pressure steel lines can develop stress fractures if they are bent or straightened, which may lead to dangerous leaks. Replace the line with the correct OE-formed Cummins tube instead of trying to repair a damaged line.
SHOULD I REPLACE ALL LINES OR JUST THE ONE THAT FAILED?
If one line has cracked from age, vibration, or improper routing, the rest of the set may not be far behind. Many customers choose to replace all six Cummins lines (3943765, 3943767, 3943769, 3943771, 3943773, 3943775) at the same time for maximum reliability, especially on higher-mileage VP44 trucks.
DO I NEED NEW CLAMPS OR RETURN LINES WHEN INSTALLING THIS PART?
It’s good practice to inspect and replace cracked or missing line clamps, and to check the fuel return plumbing. CPP Diesel offers the genuine Cummins 3942966 fuel return line (cylinder head to tee) and matching line hardware to complete a professional repair.
