I think your leak is somewhere in the fuel system, so the lines at the injector at the back of the engine are suspect. How does the engine run? Are all of the metal fuel line braces and supports in place?

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC