Gday, the copper washers on the supply line leak after a while as they lose there crush that may be the leak at the top .
My fuel pump today stopped delivering high pressure fuel, I suspect the fuel soleniod has failed . I have to remove the top of the fuel pump to replace it .I will speak to Fremantle fuel injection tomorrow and ask about your problems and see if i can help. This is the first problem with anything with my fuel system for 120 000 ks touch wood. God love it.