Injector hard lines may not be seating properly on top of the delivery valves
(allowing fuel to slowly leak out of the hard lines when the car sits for a long while).

The number two hard line in particular looks askew.

White tissue paper is ideal to use for a touch test to find those hard to spot fuel seepage locations.

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78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022