General Motors
- Relieve fuel system pressure by removing "FUEL PUMP" fuse from fuse block. Crank engine. Engine will start and run until fuel remaining in fuel lines is used. After engine stops, crank engine an additional 3 seconds to relieve any remaining pressure. Turn ignition off and install fuel pump fuse.
- Connect a fuel hose to throttle body feed line. Route line to a one quart, calibrated container. Apply battery voltage to terminal "G" of Assembly Line Communications Link (ALCL). See Fig 1 . Fuel pump should supply 1/2 pint (240 ml) or more of fuel in 15 seconds.
- If fuel supply is okay, pump is operating properly. If fuel supply is not okay, check for restrictions in supply line. Repair or replace line if necessary. If there are no restrictions, perform FUEL PUMP PRESSURE TEST .