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Sounds like fuel feed problem. Could be relay to fuel filter to fuel pump. Start by listening to see if pump comes on when key is turned from off to run position, should run for just a few seconds for prime. Should be valve on fuel rail on engine to check pressure, pressure should be around 40+ psi.
Could be. Does it sound kind of harsh. Should be a soft whirl sound. Could be the security system. Does the security light stay on? Do you hear the pump running after it starts? You can rent fuel pressure testers from auto parts stores.
Some GM products also incorporate the oil sender switch into that circuit for fuel pump, so that in case of an accident, engine shuts off, oil pressure drops, in turn, shuts off power to fuel pump. May be worth a look at what your getting for oil pressure, as well as checking switch/sender.