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Most common for this concern is to have a fuel pump go bad after the car has ran. What happens when the pump runs and gets hot then the vehicle is shut off, the pump does not like to turn back on until it is cooled a little bit. Unfortunally it is hard to diagnois as it is an intermittent problem. What we typically do is when the vehicle fails to start, spray a little starting fluid in the air intake tube and if it starts, we know the pump is bad.