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)

Industrial/Off-Highway: Used primarily on B-Series 5.9L (Euro 2 / ISB5.9) configurations—verify by ESN before ordering.

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.