Fuel Pump Flow Test
- Relieve fuel system pressure by removing "FUEL PUMP" fuse. Crank engine. Engine will start and run until fuel in lines is used. After engine stops, crank engine an additional 3 seconds to relieve remaining pressure. Turn ignition off and install fuel pump fuse.
- Connect fuel hose to throttle body feed line. Route line to one quart, calibrated container. Apply battery voltage to terminal "G" of Assembly Line Diagnostic Link (ALDL) connector. See Fig 1. Fuel pump should supply 1/2 pint (240 ml) or more in 15 seconds.
- If fuel supply is within specifications, pump is operating properly. If fuel supply is less than specifications, check for restrictions in supply line. Repair or replace line if necessary. If there are no restrictions, perform FUEL PUMP PRESSURE TEST.