Fuel Pressure

NOTE: For fuel pump specifications, see FUEL PUMP PERFORMANCE .

Release fuel pressure. See FUEL PRESSURE RELEASE . Disconnect negative battery cable. Remove bolt and fuel inlet hose from fuel rail.
Install Adapter (J-39802) with gaskets and fuel inlet hose to fuel rail. See Fig 1 . Tighten adapter retaining bolt to 22 ft. lbs. (29 N.m). Install Fuel Pressure Gauge (J-34730-1A) to adapter.
Reconnect negative battery cable. Turn ignition on. Connect jumper wire between Data Link Connector (DLC) terminals B+ (Black/Red wire) and FP (Blue/Black wire). DLC is located on left strut tower. Check fuel pressure. See Figure or Figure . Release fuel pressure. Remove fuel pressure gauge. Remove jumper wire from DLC.

Fig 1: Installing Fuel Pressure Gauge

Courtesy of GENERAL MOTORS CORP.

FUEL PUMP PERFORMANCE

Application

Pressure: psi (kg/cm² )

Prizm & Prizm LSi

⁽¹⁾⁽²⁾ 38-44 (262.0-303.4)

⁽¹⁾	With ignition on, engine off, and jumper wire connected between DLC terminals B+ and FP. DLC is located on left strut tower.

⁽²⁾	With engine idling, jumper wire removed from DLC and pressure regulator vacuum hose disconnected and plugged. Reconnect vacuum hose. Pressure should decrease to 31-37 psi (213.7-255.1 kPa).