I replaced the 1/8 soft copper line on my 29 Plymouth with 1/8 90/10 copper/nickel after the soft copper line broke at the vacuum tank fitting while on a Saturday morning drive. Amazing how fast the oil will pour out of the tiny line when it brakes.
Opps! I was talking about the other 1/8 copper line, the one to the oil gage. On my engine both come off the oil/vac pump, although on some it comes off the other side of the engine. Both lines are 1/8 copper. I changed both to 90/10 copper/ nickel. The vibration eventually broke the oil pressure line at the fitting. Had to call my wife and she brought me the tools to repair it so we could drive it home.
Opps! I was talking about the other 1/8 copper line, the one to the oil gage. On my engine both come off the oil/vac pump, although on some it comes off the other side of the engine. Both lines are 1/8 copper. I changed both to 90/10 copper/ nickel. The vibration eventually broke the oil pressure line at the fitting. Had to call my wife and she brought me the tools to repair it so we could drive it home.