run problem with Onan Marquis 5000 BGM
fuel pump approx 6months old - tested pumping good fuel filter NOT clogged - it is passing fuel, yes enough fuel yes it has enough oil it will start , run a few seconds quit im thinking stuck/...
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Try looking around at http://m.flightsystems.com/, particularly the Onan troubleshooting guide, which has an oil pressure switch location section.
