White smoke trail is usually positive evidence of air in the lines. With no smoke and a full UAT you're looking at a failure to deliver fuel to the engine. So: pump, solenoid, filter, blockage....??You might look under Info and see what the last pump off voltage was which may or may not tell us anything. I'd pull the fuel line from the engine and see if the pump is working. Under Test Functions, use the Purge Fuel System to run the pump like you're purging the lines except use the right arrow to run the pump voltage up over 2 volts or so. You're looking for a failed/stuck pump, failed solenoid or other blockage. It's also possible the problem is in the ECU.