Product Description
CUMMINS 3936953 OEM FUEL INJECTOR CONNECTOR TUBE – RAM 5.9L (1998.5–2002)
Keep your VP44-fueled 5.9L Cummins happy with this genuine Cummins 3936953 OEM fuel injector connector tube (male connector). This crossover tube seals the high-pressure connection between the injector and the fuel line to maintain proper rail pressure, clean injector operation, and smooth idle on 1998.5–2002 Dodge Ram 2500/3500 trucks equipped with the 24-valve ISB engine.
Unlike cheap aftermarket copies, this Cummins connector tube uses hardened sealing seats and precise internal machining to reduce leakage, prevent aeration in the fuel system, and protect expensive injectors from cavitation damage. If you’re installing new injectors or chasing a rough-running VP44 truck, replacing worn crossover tubes is a must-do step.
KEY FEATURES
- Genuine Cummins male connector tube – part #3936953
- Direct-fit for 1998.5–2002 Dodge Ram 2500/3500 5.9L 24V (VP44 injection pump)
- Seals injector-to-line interface to maintain proper injection pressure
- Hardened seat for long life in high-pressure diesel service
- Sold individually – 6 required per engine (one per injector)
FITMENT
- 1998.5–2002 Dodge Ram 2500/3500 – 5.9L Cummins ISB, 24-valve, VP44 pump (US light-duty pickup applications)
- Also used on select industrial ISB/ISC 5.9L & 8.3L applications – always confirm by ESN before ordering.
CROSS-REFERENCE / INTERCHANGE
This Cummins 3936953 fuel injector connector tube is commonly cross-referenced to:
- Cummins: 3936953, CUM3936953
- Cummins / Service: 3944833, C3944833, C4931173, 4931173, 3044700
- Mopar: 5013856AA
- Bosch: F00ZR20002 (F 00Z R20 002)
Cross-reference numbers are for identification only – always verify by VIN and/or engine serial number (ESN) before ordering.
RECOMMENDED CUMMINS-MATCHED PARTS (CROSS-REFERENCE ITEMS)
Pair this connector tube with other genuine Cummins fuel system hard lines for a complete, leak-free repair:
- CUMMINS 3946440 OEM FUEL LINE BRACKET / TUBE BRACE – RAM 5.9L (1998.5–2002)
- CUMMINS 3945707 OEM FUEL DRAIN TUBE (VP44 RETURN LINE) – RAM 5.9L (1998.5–2002)
- CUMMINS 3942592 OEM FUEL DRAIN TUBE / FUEL RETURN LINE – RAM 5.9L 24V (1998.5–2002)
- CUMMINS 3943771 OEM FUEL INJECTION LINE #4 – RAM 5.9L (1998.5–2002)
- CUMMINS 3943769 OEM #3 FUEL INJECTION LINE – RAM 5.9L 24V VP44 (1998.5–2002)
WHAT’S INCLUDED
- (1) Genuine Cummins fuel injector connector tube – part number 3936953
- Seals and O-rings sold separately
INSTALL NOTES
- Always install with a new connector tube O-ring (Cummins 3867043 or equivalent) on each tube.
- Inspect injector and line seats for pitting or damage before reassembly.
- Hand-start the high-pressure line nut to avoid cross-threading, then torque to factory spec.
- After installation, prime the fuel system and check carefully for leaks at idle and under load.
SPECIFICATIONS
| Brand | Cummins |
| Part Number | 3936953 |
| GTIN | 0615284528258 |
| UPC | 0615284528258 |
| Engine | 5.9L Cummins ISB, 24-valve, VP44 (1998.5–2002 Dodge Ram 2500/3500) |
| Application | High-pressure fuel injector connector (crossover) tube; one required per injector |
| Cross Reference | 3944833, 3044700, C3944833, C4931173, 4931173, Mopar 5013856AA, Bosch F00ZR20002 (F 00Z R20 002) |
| E-Codes / Notes | Used on VP44-equipped ISB 5.9L applications; also found on select ISC 8.3L – verify by ESN. |
| Material | Hardened steel fuel connector tube |
| Shipping Weight | Approx. 0.26 lb (single tube) |
| Shipping Method | Standard ground shipping; calculated at checkout from CPP Diesel |
| Country of Origin | Not specified by manufacturer |
| Prop 65 Warning | This product can expose you to chemicals including diesel engine exhaust, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov. |
FREQUENTLY ASKED QUESTIONS
WILL THIS FIT MY 1998.5–2002 DODGE RAM 5.9L 24-VALVE?
Yes. Cummins 3936953 is the correct OEM injector connector tube (male connector) for VP44-equipped 1998.5–2002 Dodge Ram 2500/3500 5.9L 24V trucks. Always confirm with your VIN or ESN if you are unsure.
HOW MANY CONNECTOR TUBES DO I NEED PER ENGINE?
There is one connector tube per injector, so a 6-cylinder 5.9L Cummins uses six tubes total. This listing is sold individually, so order a quantity of six if you are replacing the full set.
SHOULD I REPLACE THE O-RINGS WHEN INSTALLING NEW TUBES?
Absolutely. Always install new O-rings on the connector tubes and verify injector O-rings are in good condition. Reusing old seals is one of the most common causes of post-install fuel leaks and hard-start issues.
IS THIS THE SAME PART AS THE “MALE CONNECTOR” LISTED BY CUMMINS?
Yes. Cummins often refers to this tube as a “male connector.” Both names describe the same OE component with part number 3936953.
CAN I MIX THIS OEM TUBE WITH AFTERMARKET CONNECTOR TUBES?
It’s best practice to run a complete matched set. Mixing different seat geometries and materials can lead to uneven sealing pressure and may shorten injector life. For stock trucks, we recommend a full set of genuine Cummins tubes; for performance builds, use a full matched set of performance tubes.
