Hello, I have a spitfire of 71 everything completely renewed, new engine block stop everything new, Today we wanted to start them but nothing… Ignition available, petrol mixed ok, with startspray it comes from time to time, to fuss more but also not. In the error search I noticed that the suction bridge fully petrol stand he does not seem to pull this into the combustion room. In addition, when starting sometimes really hard to turn but then it comes to a bang again so a v buffing. Where’s the mistake? Mfg