Yet another go at sealing the screw fittings in the fuel valve. Not sure that the fittings have the right thread - very loose until the final seal against housing. Trouble is, the right-angle fittings end up a the worng angle when pulled up tight - so the fuel lines can't be connected. Tried backing the fittings off until aligned correctly, and sealing PFTE fuel safe paste but it doesn't go off or seal at all. Cleaned all that off and tried Loctite large thread sealer. That dried back and the threads were loose again. Next idea ........