The fuel "source" does enter the top of the pre-filter.
I think you should pull the little fuel line from pre-filter to thermostat and check those orings next. Maybe lube wiht sili grease.
Again, your leak should preceed the pre-filter.
If the fuel lines are yellowed they are old and should ALL be replaced. The entire set is something like $50 at dealer prices.
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Terry Allison
N. Calif. & Boca Chica, Panama
09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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