On The Ground

Remove air cleaner inlet tubing from throttle body.
CAUTION: FUEL SUPPLY LINES WILL REMAIN PRESSURIZED FOR LONG PERIODS OF TIME AFTER THE ENGINE IS SHUT DOWN. THIS PRESSURE MUST BE RELIEVED BEFORE SERVICING THE FUEL SYSTEM.
Relieve pressure in fuel pressure at fuel pressure test port. Refer to RELIEVING FUEL PRESSURE .

Fig 1: Relieving Fuel Pressure
Courtesy of GENERAL MOTORS CORP.
Disconnect fuel feed line at fuel rail and install Gauge Bar Set SA9127E into fuel line.

Fig 2: Installing Gauge Bar Set (SA9127E)
Courtesy of GENERAL MOTORS CORP.

CAUTION: NEVER DRAIN OR STORE FUEL IN AN OPEN CONTAINER DUE TO THE POSSIBILITY OF FIRE OR EXPLOSION.
Connect suitable fuel hose to adapter fitting and connect other end of hose to certified fuel handling cart.
Connect Tech-2 7000081-SAT3 to vehicle and turn ignition On.
Energize the fuel pump using the Scan tool. Refer to ENERGIZING THE FUEL PUMP .
Pump out all fuel (or until no more than 1/4 tank remains).