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I would suspect a faulty ECM (engine control module). The ECM is like a car's brain that when it's faulty something will surely fail. I believe that you'll be good after the ECM replacement.
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Not sure here as europeon mechanic with no pratical but i would check for a valve on the fuel delivery pipe and this valve will have a vacumn type chamber on it and a vacumn pipe ,On this age vehicle its not uncommon for this valve to fail and will stop the fuel pressure in the feed so it will not fire up .This valve is to stop the fuel from leaking past a injector if the ignition is left on for any reason so check the vacumn pipe for leaks first that control this valve as this is the most common cause of non start .
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this eng does not have a vacuum line to fuel psi regulator it's inside of manifold If that were the case It would start when I spray fuel in throttle body! It does not start floods out . But when I do get it started it runs great after 13 hours of sitting it will not restart
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