Release fuel pressure. See FUEL PRESSURE RELEASE under FUEL SYSTEM. Disconnect negative battery cable. Remove banjo bolt from cold start injector fuel line.
Install Adapter (J-38347) with 2 new gaskets. See Fig 1 . Tighten adapter retaining bolt to 13 ft. lbs. (18 N.m). Install Fuel Pressure Gauge (J-34730-B). Ensure shutoff valve is closed on fuel pressure gauge.
Install negative battery cable. Turn ignition on. Install jumper wire between "B+" terminal and fuel pump terminal of diagnostic connector located on left strut tower. See Fig 1 . Check for fuel leaks.
Open fuel pressure gauge shutoff valve. Open fuel pressure gauge air-purge valve to bleed trapped air/fuel into container. Close air-purge valve. Check fuel pressure. 2) Install negative battery cable. Check fuel pressure. See FUEL PUMP PERFORMANCE table. For complete Fuel System Pressure Test Procedure See DIAGNOSTIC CHART A - 7.
Release fuel pressure and remove fuel pressure gauge. Install cold-start injector banjo bolt and tighten to 13 ft. lbs. (18 N.m).

Fig 1: Installing Fuel Pressure Gauge

Courtesy of GENERAL MOTORS CORP.

FUEL PUMP PERFORMANCE

Application

Pressure psi (kg/cm² )

Prizm & Prism GSi

⁽¹⁾ 38-44 (2.7-3.0)

⁽¹⁾	Specification listed with jumper wire installed between Black/Red wire and Blue/Black wire terminals in diagnostic connector located on left shock tower, ignition on, engine off and pressure regulator vacuum hose disconnected and plugged.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Fuel Pressure