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Well I tried doing those things but what I thought was the filter, underneath the car just pass the pump in front of the gas tank obviously is not the filter and don't know where the filter is located.
This could indicate a weak fuel pump or clogged pump strainer. I would start by replacing the fuel filter since this should be done every two years. The fuel pressure bleeds off after some time so the pump has to try to build the pressure back up on a cold start. This is the cheapest and easiest fix to try first.
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.
Have you flushed out all of the old unleaded fuel from the system and fitted a new fuel filter? Unleaded fuel only lasts for a very short while before going off. You need to flush out the tank and the fuel lines and then put fresh fuel in the tank and fit a new fuel filter or you could be leading yourself on a wild goose chase.
Do you hear the fuel pump running for a second or two when you switch on the ignition? If not then you need to check the fuel pump positive terminal for battery voltage with a volt meter whilst someone switches on the ignition for you, and check the fuel pump negative terminal to ensure it is properly earthed.
If you have a live and an earth at the pump but the pump still isn't running then you need to renew the fuel pump.
If these suggestions don't solve your problem then I'll need to know what size engine is in the car before I advise you further.