an 3/8 SS, not once but twice. The bends didn't get me, the double flares did. I highly recommend not using SS if you have to do your own flares. I went through two flare kits trying to get a double flare I could trust. Finally went with SS braided from Holley up from the mechanical pump to the area in front of the water pump. From there it is all aluminum fittings from Summit and some from Holley. I put a Holley filter in the line from the water pump area to the double pumper dual feed with a fuel pressure gauge. I'm satisfied with my set up, but I nearly had a serious problem with a SS flare leaking over the intake manifold and the pan. My fault, not the material's, but don't take short cuts with the SS line if you use it.
