New to this forum first post. I have stripped down my Tilly lamp X246B. Replaced all the rubbers as per. But I cannot keep the pressure up unless I continually pump. All the filters are clean and the needle is working. Checked the pump under water works well. Cleaned the tank out and it's now all fresh fuel. The only seal I was not able to change was the one at the top of the tank as I'm struggling to get the nut of. For the life of me I cannot see where the pressure is leaking out. Any advice would be most welcome as I'm pulling what hair I have let out.