Well....David, that is amazing! I am away from at the moment but have removed the tank and will measure it as soon as I get back and let you know directly. Re the pump, mine is almost brass coloured but I have only paid scant attention to it in the initial clean so I am more than likely completely off base. Will be back to you in a few days. Cheers and thanks to you all Rich. PS have come up with a small potential modification to allow me to use engine to power one of my Honda’s....