Your lines appear to be leaking at the supports, like mine did. Cut with a mini tubing cutter, use more hose. I replaced both fuel lines with new coated brake line tubing.

__________________

Present
1987 300SDL
1991 300SL
1990 560SEL
2001 ML320

Past
1969 200D 1979-82
1983 300SD 1984-85
1972 250C 1982-02
1995 S350 2011
1997 S320 2012