Thanks for the help. I've had another look and it is coming from either behind the electrical connection to the pump, or from the banjo union next to it but it is difficult to see. The other bit of evidence is that is only leaks when the engine is running, running at idle is enough to show the problem. It is only a tiny leak, but I'd like to sort it. My guess is that it is a copper washer on the banjo letting fuel past. I suppose the only way to know is to replace the copper washers and see what happens. I cant see how the leak can come from behind the electrical connection unless the pump is foo barred - comments? Im guessing that when I undo the union, I need to make sure the fuel is below the level of the union or I'll get wet? Thanks again Julian