with a fuel pressure gauge. First pop a vac line off the mani, use the pcv line, and spray some brake clean in while a buddy turns the car over. if it fires you have a fuel delivery issue. assuming it fires off the brake clean then pull the carpet in the trunk & check for voltage at the pump. if you have voltage it's likely the pump, if not it's electrical. post up what you find. if it's electrical I'll post up the diagrams so you can trace it down