here is my diagram with dimensions of pipe
The way I got round going from 8 mm to the 10mm on the walbo (not 100 percent sure the walbro have 10mm ends, but ordered one today so will check when it arrives, or if someone can tell me) is to buy an after market fuel filter, you can have them with different sized ends from tweeks to take it up to ten mil, my only probelm with that is that the filter now behind the pump, is that ok to suck not push it through the filter?
to go from the 6mm on the pump to 8mm on the swirl pot I am going to get some brass reducers made up like so
I am sorry I only have paint and I cant draw.
If i cant have the filter behind the pump, ill get a 10mm both end filter and another reducer going from 10mm to 8mm to sort it.
I am looking at ordering 5m of 10mm braided pipe, 5m of 8mm pipe and 2m of 6mm pipe. thats more than enough but no point running out, if anyone else likes the look of this let me know and I can order more stuff, still waiting for a price on the pipe