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im a lic tech, changed the engine 3.6 buick lacross,an now I have no fuel,car on 2011 Buick LaCrosse

runs on starting fluid,an well stay running, I have a fuel issue,its like the car runs then shuts off,maybe fuel delivery is being shut down, any ideas

Asked by for the 2011 Buick LaCrosse
ALL intake hoses hooked up(NO leaks!). Do you have a scanner to monitor live data when trying to start it? Watch injector pulse width/command.