Doesn't sound like you replaced the large quarter sized oring beneath the pre-filter? Has to be ordered separately. You wouldn't be the first to throw it away and have to go dumpster diving to retrieve it.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)