under tank hose for communicating vase (Link pipes) (SOLVED)

[Bixxer Bob]

Glad you sorted it KlangKling,  there's a limit to what we can do from afar but your persistence paid off.  Well done!!!!

Hope you don't now find you have fuel leaks after disturbing the scew fittings in the blind holes 

Only kidding.....

[klingklang]

the fitting have a standard o-ring under. I'll put new ones anyway

[nickjtc]

Occams Razor strikes again. The simplest solution without the introduction of too many new variables is usually the correct one.