Subaru Workshop Service and Repair Manuals

Fuel Pressure: Testing and Inspection

Fuel Pressure Gauge

1.

Release fuel pressure.

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.

Unregulated Pressure:  235 - 265 kPa (34 - 38 psi) 

6.

Connect vacuum hose to fuel pressure regulator.

7.

Observe fuel pressure reading.

Regulated Pressure:  177 - 206 kPa (26 - 30 psi)