Shut down on interstate and won't start back . Did one time for about 2 min. Have checked the fuel shut off and the fuel pump. Pump is working although not sure if correct pressure

Hello, engines need more than just fuel to start. If there is fuel at the engine, there also needs to be the right amount of spark and the right amount of air. You'll have to continue testing to find what elements are missing. Beyond that, things like faulty PCM relays, for example, can cause unexplained stalling. But that's a total wild guess, and likely not the cause of your troubles. Hands on testing is what you need. www.repairpal.com/repair-shops