I have just found that my 73 3500s is leaking fuel from the reserve tap unit located in the engine bay on the right hand side behind the engine. It is a regular drip which drops onto the exhaust and luckily it is in the garage. The Rover Repair Manual states that you should drain the fuel tank and then remove it. Easier said than done. Access is on the scale of a Mini. Fortunately I installed a pit when I had my garage built so I have access from below. With the aid of 'er indoors we will move the vehicle by pushing it into position. I suspect that the leak comes from the tap unit. Can these be serviced or replaced? Assistance would be appreciated and also are nuts on the fuel lines AF Metric,BSF or Whitworth? I do not relish the the thought of staring at a tidy 3500s which I cannot drive.