Subaru Workshop Service and Repair Manuals

Fuel Pressure Regulator: Testing and Inspection

Fuel Pressure Gauge

1.

Release fuel pressure.   See: Fuel Filter/Fuel Pressure Release

2.

Install fuel pressure gauge.
a. Disconnect fuel hose from filter.
b. Connect fuel pressure gauge between hose and filter.

3.

Start engine.

4.

Disconnect vacuum hose from fuel pressure regulator.

5.

Observe fuel pressure reading.

Fuel Pressure
235 - 265 kPa (2.4 - 2.7 kg/cm, 34 - 38 psi)

6.

Connect vacuum hose to fuel pressure regulator.

7.

Observe fuel pressure reading.

Fuel Pressure
177 - 206 kPa (1.8 - 2.1 kg/cm, 26 - 30 psi)