my lines at the rear where they go over the sub-frame developed rust and were weeping. Really hard to find when there is a lot of dirt and grunge in the space between the body and sub-frame. It became VERY apparent when the fuel lines started leaking in the same spot for the same reason... (Former New England car) - MC most likely, but there is another place or 2 to poke at... Good luck!

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1985 300D
The rest:
1957 MGA (comatose)
1965 Falcon (sleeping)
1966 E-100 (rust test in progress)
1976 Ford 3400 D Tractor (workhorse)
1978 Mercury Zephyer (5L playtoy)
1995 Isuzu NPR D (fetcher)
1998 Subaru Legacy (Spare)
2000 Toyota Sienna (School bus)
2008 Toyota Prius (Commuter)