Fuel lines from tank - leaking slow

[jt20]

Searched this one with few good answers. This was the best. Opinions please, I need t change bothe lines coming off the tank under the wagon's rear. (1985 300TD)

"On my wagon I was able to change the supply hose without draining the tank. I clamped the hose and removed it from the metal fuel line. Installed the new line on the metal fuel line, unclamped the tank end of the original line, pulled it off and then put my finger over the outlet. I was then able to quickly put the new hose on without losing too much fuel."