⚠️ Subaru manufacturer position
Subaru STIS pump access under rear seat on most WRX; high-pressure fuel system inspection mandatory if engine ran.
Vehicle information
| Make | Subaru |
|---|---|
| Model | WRX |
| Market status | Sold new in the US 2002–present (standalone WRX sedan) |
| Body styles | Sedan |
| Generations | GD, GR/GV, VA (2015–2021), VB (2022–present) |
| Engine options | Gasoline: 2.0L or 2.4L turbo boxer flat-four; premium fuel recommended |
| Fuel tank capacity | 15.9 gal (60 L) typical |
| Fuel system | Gasoline direct injection turbo; sensitive HP fuel system |
| Access method | Under-rear-seat pump module access (typical VB/VA) |
| Anti-siphon | Yes |
| Service portal | Subaru STIS (Subaru Technical Information System) |
Misfuel risk High
Turbo DI WRX is sensitive to diesel contamination; even short cranking can pressurize wrong fuel toward injectors.
If the engine was not started
Drain immediately; replace filter before first start.
If the engine was started
Assume HP pump and injector inspection; catalyst and turbo damage possible.
Access procedure
- Do not crank if wrong fuel suspected
- Relieve pressure; disconnect battery
- Access pump via rear seat STIS procedure
- Drain tank completely
- Replace fuel filter and inspect HP pump per STIS if key was on
- Prime DI system and check for leaks before boost
Notes
- VB WRX uses 2.4L turbo with revised DI hardware
Related models
- Impreza
- STI (historical)
Frequently asked questions
What if I put diesel in my WRX?
Do not start the turbo engine. Drain per STIS and replace filters; inspect HP fuel hardware if the pump ran.
Why is WRX misfuel risk rated high?
Direct injection turbo systems move fuel at high pressure quickly once the ignition is cycled.
Should I use premium gas after a WRX misfuel drain?
Refill with the grade Subaru specifies for your turbo engine after the tank is cleaned and filtered per STIS.
Need professional misfuel recovery?
Find a certified operator or read consumer guidance for your next steps.
Find an operator Consumer guidance