Current motor scheduled for maintenance due to gas leak at motor. This has the old style of tank with pumper button, not priming bulb. <br /><br />Does not leak immediately. Have run for many hours with no leaks, when at rest it will drip, drip, drip from inside bonnet. Not very ECO friendly. Is this gasket related? Is there an over pressure releif valve?<br /><br />Please advise