It was upright in a van, only tilted a little on a sack barrow. The point about the waste pipe was could it have caused an air lock? Just realised it can’t have as water was filling & discharging ok. Looks like I will have to refund. Thanks for your help.
Many thanks, buyer has checked all those parts & said all ok. B4 removing I removed as much Water as I could from waste tube, is it possible that caused a problem?