I have to admit stainless brake and fuel lines really make it hard to seal things. I won't use stainless again because of this, but THIS particular truck its necessary. You can get stainless fittings that may help. Don't use any plumbers tape or sealer and loosen and retighten several times to see if they will seat eventually. You will get it to seal, keep at it.
The next truck I do will be using the new nickel alloy solution. No corrosion, same as stainless and much easier to work with.
