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This NP52G is mounted in a motorhome, 1990 vintage. Out of the blue, it shuts down after it runs for only 2 minutes or so. I replaced the oil pressure switch because it was cheap. I,ve changed the fuel filter and placed the fuel input hose in a gas can with fresh gas...all to no avail. Just when you think it will run this time, it shuts down @ 2 min like clockwork.