Fuel Pressure Regulator
- Disconnect negative battery cable. Install fuel pressure gauge in fuel supply line. Reconnect negative battery cable.
- Start and operate engine at idle. Ensure vacuum is available to pressure regulator. Observe fuel pressure with vacuum hose connected and disconnected at fuel pressure regulator. See the REGULATED FUEL PRESSURE table. If fuel pressure is not as specified, check fuel pressure regulator hold pressure. See FUEL PRESSURE REGULATOR HOLD PRESSURE heading below.
REGULATED FUEL PRESSURE
| Model | @ Idle W/Vacuum psi (kg/cm2 ) | @ Idle W/O Vacuum psi (kg/cm2 ) |
|---|---|---|
| Miata | 28-36 (2.0-2.5) | 38-46 (2.7-3.2) |