Fuel Pressure: Subaru
- Relieve fuel system pressure. Disconnect fuel hose at pressure regulator and install fuel pressure gauge using "T" fitting.
- Start engine and check fuel pressure at idle. On SPFI models, fuel pressure should be 20-24 psi (1.4-1.7 kg/cm2 ). On MPFI models, fuel pressure should be 26-30 psi (1.8-2.1 kg/cm2 ). Increase engine RPM and make sure fuel pressure increases.
4-CYLINDER FUEL PUMP PERFORMANCE
| Application | Pressure psi (kg/cm2 ) | Min. Vol. in 30 sec. Pts. (L) |
|---|---|---|
| MPFI | 61-71 (4.3-5.0) | 1.67 (.79) |
| SPFI | 36-50 (2.5-3.5) | 1.40 (.67) |
REGULATED FUEL PRESSURE
| Application | At Idle psi (kg/cm2 ) |
|---|---|
| MPFI | 26-30 (1.8-2.1) |
| SPFI | 20-24 (1.4-1.7) |