what size fuel lines do i need?

[stt]

What size AN fuel lines will i need for a 240-250bhp na engine

I've been looking at An-6 which is 3/8" ~ 9.5mm
or possibly an -8 which is 1/2" ~ 12.5mm

Is there anything to look out for ie certain brands better than others etc?
I seem to remember reading something where someone had a problem with a restricted connector

ive been looking at 370518108550 on ebay and the other associated connectors etc

[BRoadGhost]

I use -8, but tbh there's nothing wrong with 6; it'll be the pump[s] causing a problem before said lines.

[Jeff16v]

I used 8mm, got it by the metre from the plumbers

[BRoadGhost]

You might find the -6 high pressure lines super expensive compared with -8.

[Nova_Tek]

I've used 8mm copper for the feed line and 8mm return nylon for the tank for the LET build. Some people go as far as 10mm for the feed. 8mm fits perfect into the Novas standard fuel line brackets

[blue_peg_16v]

8mm copper form bnq

[stt]

The lines run inside the car and I will be using braided nitrile hoses
I'm running a facet red top from tank to swirl pot and then an 044 from swirl to injector rail
If there's not much in it money wise between -6 and -8 then I'll prob just go for the bigger!