Thanks - do you know the correct sequence of washers and beveled washers ? I may have to try low range torque wrench as mine is large one .Complicated. So, if you do need a new gasket it looks like the instructions imply to remove the pump and put the gasket on then replace the pump. 5Nm is not much, just about as tight as a screwdriver handled 10mm socket goes. Not many folks have and accurate low range torque wrench. A new gas tank is of course just about out of the question. But so is over tightening those little studs.
Thanks - I may have to restart and get gasket . I did replace clamps . Buy Gasket at BMW?Flat washer then the bevel spring washer then the screw. If you do go the new gasket route (I personally would) there are a number of clamps and rubber hoses involved. The clamps are one time squish clamps that take a proper tool. It is not done properly that if not experienced the hoses come off later, stopping the bike. And the hoses if original are now too old and you need a set from Euromotoelectric. You need hose that is rated for immersion in fuel. Those clamps are called oetiker clamps. You can look them up. Kits are expensive usually better to buy them from BMW or Euromotoelectric. There probably is a video on YouTube on how to install them.