Product Description
Cummins 3918880 — Fuel Supply Tube (Lift Pump to Fuel Filter)
MPN: 3918880 | Also Known As: fuel supply tube, lift pump to filter tube, fuel supply line | Notes: Requires two sealing washers (3963983) at banjo interfaces
Why This Part
- ✓ OE hard line from mechanical lift pump to fuel filter housing for proper sealing and flow.
- ✓ Direct-fit for 1994–1998 Ram 5.9L 12-valve (P-pump) applications.
- ✓ Restores factory fuel supply path after corrosion or damage.
- ✓ Durable OE construction—built to Cummins specs.
Quick Specs
| Type | Fuel supply tube (lift pump → fuel filter) |
|---|---|
| OE Part # | 3918880 |
| Sealing Washers | 3963983 (banjo) — Qty 2 required (sold separately) |
| Qty Required | 1 per engine (sold individually) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1994–1998 (incl. early ’98.5 12V) | 5.9L 12-Valve (6BT, P-pump) — Lift Pump to Filter | Ram 2500/3500 |
Industrial/Off-Highway: Used on various B-Series (4B/6B/ISB) engines—verify by ESN before ordering.
Often Paired With
- Sealing Washers (banjo): 3963983 — Qty 2 (one per side)
- Mechanical Lift Pump: Cummins 4988747 (1994–1998 12V)
- Filter-to-Injection Pump Line: complementary hard line for ’94–’98 12V
What’s In The Box
- (1) Genuine Cummins Fuel Supply Tube (3918880)
- Sealing washers and hardware sold separately (see “Often Paired With”).
Install Tips
- Always use new 3963983 sealing washers on banjo connections.
- Route and torque per factory procedure; check for seepage after warm-up.
- Prime the system after service to avoid extended crank.
FAQ
WILL THIS FIT MY 1994–1998 12-VALVE 5.9L CUMMINS?Yes—this OE tube routes lift pump → fuel filter housing on 1994–1998 (incl. early ’98.5) Ram 2500/3500 12-valve trucks. Verify by VIN/ESN.
HOW MANY SEALING WASHERS DO I NEED?Two total—use new 3963983 sealing washers (one at each banjo interface) whenever the tube is serviced.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3918880 for proper fit, sealing, and durability.
DOES THIS FIT COMMON-RAIL 5.9L/6.7L TRUCKS?No—this listing targets 12-valve (P-pump) trucks. Common-rail platforms use different plumbing.
WHAT DOES THIS CONNECT?It connects the mechanical fuel transfer (lift) pump outlet to the fuel filter housing inlet.
