MFI Calif. & New York

Release fuel pressure. See FUEL PRESSURE RELEASE . Disconnect negative battery cable. Remove fuel plug bolt from fuel rail located below fuel pressure regulator. Install Fuel Pressure Gauge (J-34730-1) and Adapter (J-41041) to fuel rail. See Fig 1 . Reconnect negative battery cable. Check fuel pressure. See Figure , Figure and Figure . Release fuel pressure. Remove fuel pressure gauge.

Fig 1: Installing Fuel Pressure Gauge (MFI - Calif. & New York)

Courtesy of GENERAL MOTORS CORP.

FUEL PUMP PERFORMANCE

Application

Pressure: psi (kg/cm² )

TBI (Federal)

⁽¹⁾⁽²⁾ 34-41 (234.4-282.7)

MFI (Calif. & New York)

Engine Idling

30-37 (206.9-255.1)

Ignition On & Engine Off

36-43 (248.2-296.5)

⁽¹⁾	With engine idling.

⁽²⁾	With ignition on and engine off.