how to stop leak and pressure drop in worcester 24cdi?

Hi, could be the non return valve on the filling manifold or one of the plastic parts of it may be spit. Isolate the electricity and dry all around the filling key to see where its coming from. Could just as easily be one of the joints as they are only held together with clips and the O rings inside often brake up. Hope that helps

Paul the gas man
May 2006