Product Description
Cummins 3918188 — 8mm Fuel System Sealing Washer
MPN: 3918188 | Also Known As: banjo bolt sealing washer, bonded sealing washer | Use: Fuel filter bleed screw & injector return line connections (2 washers per return line connection)
Why This Part
- ✓ OE sealing for leak-free 8mm fuel banjo connections.
- ✓ Direct-fit for 1989–1998 5.9L 12-valve Cummins fuel system service points.
- ✓ Helps maintain fuel pressure & cleanliness after line/filter work.
- ✓ Sold individually—order multiples for each banjo connection.
Quick Specs
| Type | Fuel system sealing washer |
|---|---|
| Size | 8 mm (banjo bolt applications) |
| OE Part # | 3918188 |
| Common Usage | Fuel filter bleed screw & injector return line banjo connections |
| Qty Required | Sold individually; typically 2 per banjo connection |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–1998 | Cummins 5.9L 12-Valve (B-Series) | Dodge Ram 2500/3500 |
Notes: Also used on related B-Series/industrial applications—verify by ESN for non-automotive engines.
Often Paired With
- Fuel Filter Bleed Screw: 3924726 (uses 3918188 washers)
- 8mm Fuel Banjo Bolt: 3916361 (requires two 3918188 washers)
- Fuel Return Check Valve: 3905707 (uses 3918188 washers)
What’s In The Box
- (1) Genuine Cummins 8mm Sealing Washer (3918188)
Install Tips
- Use two washers per banjo connection (one on each side of the fitting) where specified.
- Do not reuse old washers. Torque to spec and check for seepage after warm-up.
- Work clean to avoid contamination in the fuel system.
FAQ
WILL THIS FIT MY 1989–1998 5.9L CUMMINS?Yes—3918188 is commonly used on 1989–1998 5.9L 12-valve fuel systems for the bleed screw and injector return line banjo connections.
HOW MANY WASHERS DO I NEED?Plan on at least two per banjo connection. Many jobs need several washers—order extras to be safe.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3918188 sealing washer for proper fit and reliable sealing.
WHERE IS THIS USED?Fuel filter bleed screw and injector return line banjo connections on 5.9L 12-valve engines.
CAN I REUSE MY OLD WASHERS?No. Reusing old sealing washers risks leaks. Always install new washers.
