My mark IV spitfire has had a full service very recently ( new plug, points, condenser, new carb jets etc) and it has been running a treat. This afternoon, I decided to replace my dead fuel tank sender. When I removed the old one it was horribly rusty. I fitted the new one, which got the fuel gauge working and took the car for a spin. All was well. A bit later, I took the car for another trip, at which point it embarrassed itself by starting to run rough, finally stalling and refusing to start. I managed to restart it, but it kept running rough and got me home before stopping again and refusing to start at all. I suspect a fuel problem.D I am getting fuel to the carbs, but I wonder if particles of rust from the old sender have got into the carbs and caused blockages? If so where do I need to look for trouble?