thanks for the info, don't know how I missed that on the web site.  I ordered a few for back-ups.  I striped the plane of electronics / tank / motor. so far every thing looks ok to me but , I am taking it to a local  flying club for someone to look at it with a better trained eye.  as for the seller he says it was a used plane that he only flew once but, used is used .  he said as far as the fuel goes that he thought he had empted the tank before he pack it up for storage. but he can't  remember.  if it has to be rebuilt, I've got to start learning sometime . thanks again for the info / help on this site.