Product Description
If you’re servicing a 5.9L / ISB series diesel engine and need a reliable fuel delivery plumbing part, the genuine Cummins 3936691 fuel supply tube offers factory-fit and performance. This is the original equipment part engineered by Cummins to ensure optimal fuel system pressure, flow and durability in demanding duty-cycle applications.
This direct-fit supply tube goes between the fuel filter and injection pump (or fuel supply assembly) to maintain clean, consistent fuel feed under heavy load. Installing the OEM line upholds Cummins’ standard for fitment, reliability and service life.
Fitment Details
- Designed for use on Cummins ISB / B-series 5.9 L engines (including certain Euro-2 / P7100 pump applications).
- Applicable when replacing the filter-to-pump supply tube on the P7100 or similar fuel injection setups.
- One tube per engine; use only the OEM 3936691 line for correct plumbing geometry and fuel system integrity.
Why Choose This OEM Tube?
- Made by Cummins to exact factory specifications — ensures correct length, bends, and fittings for your engine.
- Helps prevent fuel delivery issues, leaks or pressure drop due to aftermarket or incorrect lines.
- Simplifies installation with proper fit — no modifications needed.
Cross Reference / Alternatives
While this page is for the OEM Cummins part, you may also consider other related tubing and fuel supply plumbing items when doing a full fuel system service:
- CUMMINS 3933978 OEM VACUUM PUMP GASKET – 5.9L CUMMINS (1994-2002)
- CUMMINS 3933979 OEM VACUUM PUMP SHAFT SEAL – 5.9L CUMMINS (1994-2002)
- CUMMINS 3974114 OEM VACUUM PUMP REBUILD KIT – 5.9L CUMMINS (1994-2002)
FAQ
Will this tube fit my 1994-2002 5.9L Cummins?
Yes — this OEM tube 3936691 is designed for Cummins 5.9L / ISB series fuel supply plumbing. Confirm your engine’s pump model and filter configuration as some variants may differ.
Is this the full fuel line kit or just one tube?
It is one genuine Cummins supply tube (filter to pump). Additional fittings or lines may need to be replaced separately depending on your service.
Why use the OEM line instead of an aftermarket hose?
Using the genuine line ensures correct geometry, factory-rated materials and avoids potential issues like leaks, pressure drop or incompatible fittings—common if an incorrect tube is used.
Does this tube carry fuel under high pressure?
Yes — this supply tube routes fuel from the filter to the pump in a heavy-duty diesel fuel system, so it must maintain tight tolerances for proper fuel flow and pressure.
| Specifications for CUMMINS 3936691 | |
|---|---|
| Part Number | 3936691 |
| Brand | Cummins |
| Application | Fuel supply tube, filter to pump, for Cummins 5.9L / ISB series engines |
| GTIN | – (not publicly listed) |
| UPC | – (not publicly listed) |
| E-Codes / Emissions | Not applicable |
| Shipping Info | Shipment size approx 12.5″ × 0.75″ × 0.75″, weight approx 0.25 lbs. |
| Prop 65 Warning | WARNING: This product can expose you to chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. For more info visit P65Warnings.ca.gov |
| Cross Reference | OEM Cummins line 3936691; interchange of equivalent lines may exist but for guaranteed fit use Cummins part. |
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Product Reviews
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95’ Dodge fuel supply line
This part was different than my original OEM part on my 95’, mine was solid tubing, but this fit like it was supposed to. Easy repair.
