Product Description
Cummins 3936691 — Genuine P7100 Fuel Supply Line / Tube (Filter to Pump)
MPN: 3936691 | Also Known As: fuel supply line, fuel feed tube, inlet line (filter → injection pump) | Position: Fuel filter housing to P7100 injection pump
Restore factory fuel plumbing on your 12-valve. The genuine Cummins 3936691 fuel supply line is the OE tube that connects the fuel filter outlet to the P7100 pump inlet on 1994–1998 Ram 2500/3500 5.9L 12V. Built to OE bend profile and flare specs for a leak-free, direct-fit install.
Features & Benefits
- OE routing & geometry for proper clearance to accessories and manifolds.
- Direct-fit replacement for 1994–1998 12-valve P-pump trucks.
- Restores reliability vs. aged, kinked, or improvised rubber hose sections.
- Durable steel construction with correct end forms for sealing washers.
- Genuine Cummins quality for long service life.
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1994–1998 | 5.9L 12V (P7100) | Ram 2500/3500 |
Industrial/Off-Highway: Used primarily on B-Series 5.9L (Euro 2 / ISB5.9) configurations—verify by ESN before ordering.
Compatibility Notes:
- Ram 1998.5–2002 (VP44): not a direct fit. Some P7100-conversion builds use this line; verify your conversion parts list.
- Common-rail (2003+): uses different fuel plumbing.
Specifications
- Type: Rigid fuel supply tube (filter outlet → injection pump inlet)
- OE Part Number: 3936691
- Ends/Sealing: Uses sealing washers at each banjo/union (see “Often Paired With”)
- Quantity Required: 1 per vehicle (sold individually)
Often Paired With
- Sealing washers (required): (2) 3963988 (14 mm) and (2) 3963983 (12 mm) for line connections
- Fuel filter & gaskets: service while the system is open
- Primer lift pump check (address any suction leaks before start-up)
What’s In The Box
- (1) Genuine Cummins Fuel Supply Line / Tube (3936691)
- Sealing washers sold separately (see “Often Paired With”).
Installation Tips
- Route the tube exactly as OEM to avoid contact with hot or moving components.
- Always use new sealing washers; torque to spec and re-check after warm-up.
- Prime the fuel system and inspect for seepage at both ends before road test.
FAQ
WILL THIS FIT MY 1994–1998 12-VALVE RAM?
Yes—this is the OE line from the fuel filter to the P7100 pump on ’94–’98 5.9L 12V Ram 2500/3500.
DOES IT COME WITH SEALING WASHERS?
No—order washers separately: (2) 3963988 (14 mm) and (2) 3963983 (12 mm).
DOES THIS FIT VP44 OR COMMON-RAIL TRUCKS?
Not directly. It’s for P7100 (12-valve). Some VP44 trucks converted to P-pump may use this line—verify your conversion kit.
WHAT DOES THIS LINE CONNECT?
It connects the fuel filter housing outlet to the P7100 injection pump inlet.
IS THIS A GENUINE CUMMINS PART?
Yes—OE Cummins 3936691.
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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.
