fuel pipe sizes

[royz]

when adding EFI do you need to replace all the fuel lines or are the existing ok to use.

[TNT ANDY]

So long as they are in good condition they will be fine, I would check to see if the ends of the pipes are flared / ribbed as you will be running a fair bit more pressure, also the rubbery stuff I would renew on the delivery side of things to be safe anything after the pump on the delivery side of things.