OVERVIEW
Genuine VW/Audi N-904-264-02 is an individual O-ring used in the original fuel-preheater/filter valve arrangement assigned this factory seal number. The confirmed Jetta TDI application below lists it with valve 191127247A in the diesel fuel-filter assembly.
Technical details and what is included
- Factory part number: N-904-264-02 / N90426402.
- Factory catalogue nominal seal size: 15.4 × 1.8 mm.
- Quantity supplied: one individual O-ring.
- Valve, retaining clip, fuel filter and other separately specified seals are not included.
The nominal size identifies the factory seal specification; select the seal by its original part number and valve/filter arrangement rather than size alone. Confirm the original groove and mating connection before ordering. No material compound, temperature rating or universal chemical compatibility is specified here.
Common reasons to replace
- The original seal is cut, damaged or no longer seats correctly.
- A diagnosed leak is traced to the assigned valve/filter sealing connection.
- The original O-ring is lost or damaged during fuel-filter or valve service.
- The factory repair procedure calls for seal renewal when the original connection is opened.
Inspect the valve body, sealing groove and filter connection separately. A new O-ring does not repair a cracked valve, damaged filter connection or a separate hose leak. Diagnose the affected fuel-system connection before choosing the required repair components.
Vehicle fitment
The confirmed application requires the original diesel fuel-filter valve design listed below. Different valve grooves, gasoline filters and other sealing connections must be verified independently.
| Vehicle | Model years | Engine | Configuration | Application restrictions |
|---|---|---|---|---|
| Volkswagen Jetta | 1997 | 1.9L TDI diesel inline-four | Mk3 sedan; front-wheel drive; Original factory transmission; original fuel-filter/valve assembly determines fitment | Original fuel-preheater/filter valve arrangement using valve 191127247A and the assigned N90426402 seal. Match the original valve groove and filter connection; gasoline filters and different valve/seal designs are separate. One O-ring supplied; valve, retaining clip and fuel filter are separate. |
| Volkswagen Jetta | 1998–1999 | 1.9L TDI diesel inline-four; AHU | Mk3 sedan; 1999 carryover 1H only; VIN through 1H-X-245000; Original TDI transmission; no seal-specific transmission restriction listed | Original 191127247A fuel-filter preheater valve with the assigned 15.4 × 1.8 mm N90426402 sealing groove. Verify valve and filter arrangement. Excludes later 1J/Mk4 filter connections, gasoline filters and different seal sizes; one O-ring supplied. |
| Volkswagen Golf | 1999 | 1.9L TDI diesel inline-four; AHU | Mk3 hatchback; early 1H carryover only; VIN through 1H-X-245000; Original TDI transmission; no seal-specific transmission restriction listed | Original 191127247A fuel-filter preheater valve with the assigned 15.4 × 1.8 mm N90426402 sealing groove. Verify valve and filter arrangement. Excludes later 1J/Mk4 filter connections, gasoline filters and different seal sizes; one O-ring supplied. |
Installation and service guidance
Follow the factory fuel-filter service procedure for the original diesel system. Prepare the connection as directed, keep contamination out of the opened filter and valve, and remove the old seal without damaging the groove or mating surface.
Inspect and clean the original sealing location using the prescribed method. Install the new seal with the preparation or lubrication specified in the repair information, taking care not to twist, pinch or cut it. Renew separately specified seals and retaining parts when required by the original valve arrangement.
Refit the valve and retaining clip according to the factory procedure, verify correct seating and restore the original hose routing. Complete the prescribed priming or bleeding steps and inspect the serviced connection for leakage after reassembly. Use the vehicle service information for the exact filter and valve procedure.