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Fire valves are very easily blocked. You need your entire oil line flushed.
It is best to remove the fire valve to flush the open ends of pipe to give good flow for flushing and to avoid a lot of crud just blocking fire valve.
Oil pumps won’t last long when oil line is nearly blocked
It is best to remove the fire valve to flush the open ends of pipe to give good flow for flushing and to avoid a lot of crud just blocking fire valve.
Oil pumps won’t last long when oil line is nearly blocked