I changed out my fuel filters yesterday, no major crap-ups, but today I notice it's leaking diesel oil from around the seal...

Let's list things I could have forgotten.

I tightened down the big bolt on top until I couldn't move it anymore, I had covered the O-Ring with oil before I tightened it back up...there was a really small o-ring included in the replacement set (fuel filter + a tiny o-ring) that I didn't replace because I didn't know what it went to, could that have caused it? Also the bolt you turn to bleed air, is tightened down until it won't go anymore either.

Maybe it's just not tight enough? Or does it have to line up a certain way? I noticed the bolt has a fluid channel in it for stuff to flow through.

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1983 Mercedes-Benz 240D
Automatic, A/C, Power Sunroof, Power Right Side Mirror
231K Miles FOR SALE MAKE OFFER