I had the fuel pump on my 2000 Chevy Suburban replaced. When I got the car back my gas tank was almost empty it had 140 worth of fuel in it. couldn't the mechanic put the fuel back? or did they keep it for themselves?
Fuel pumps are housed inside the fuel tank, the tank has to be dropped from the vehicle in order to typically access the pump inside. The tank can be very heavy if full of fuel when this procedure is performed. Most of the time this fuel when drained goes in a huge vat of waste oil, and can not be saved or recycled at that point.