Sand, clean with acetone and try Epoxy SuperMend. If it's a small hole, put in a screw with a rubber washer. If the area is large and flat, screw on a plate with a rubber gasket. I've also watched a person weld a fuel tank. The trick is to run the exhaust from a car into the tank while welding so it can't explode.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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