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Will it continue running if you keep spraying starting fluid?
The fuel pressure should read 55-62 PSI nothing more or less. Sounds like it is a bit under that. This could be just a bad gauge but I suspect something more here. Could have a bad ground/power causing lower than 12 volts to the pump or weak ground this will produce less pressure. It also could be some bad fuel. I would begin by Testing the fuel. Take a cup of fuel and let it sit. See if the fuel seperates with sediment. If nothing settles try pouring a little and lighting it on fire. If it does not light it could be contaminated with water. If this checks out than verify the spark plugs are getting fuel. Since it is not starting they should be wet. If they are not I suspect you have an injector issue. If they are wet than I suspect bad fuel.