i have ordered some 7 core trailer flex to wire the lighting in the car. each core has a csa of 0.5mm2 which can carry 11 amps. will this be ok for the fuel pump also? and things like main beam headlights? cheers

My fuel pump has a 7.5A fuse, with an expected max current consumption of 4A. It's a bike pump, BTW.

For headlights, the consumption is max 60w ish, ie 5amps, so it should be ok for that too,..

great stuff, should be able to have a go at wiring this weekend!