Pleiades and Crew

Well after sleepless nights worrying, I came to the conclusion it must be fuel, last night was my last go . I pulled out the fuel pump separated the two sections and noticed a small black O ring the is on the joining tube for the two half of the carrier.
Looked at the O ring thought it didn't look seated properly so pulled it out and out pops a small flat disk with a nipple!.
Reset the O ring on the smaller tuber and "snapped in" the disk, put it all back to gather popped the tank on.....
First press of the starter off she went!!

So for anyone pulling a pump apart we aware of the O ring !

I slept well last night!, now to get a back wheel!