My 190D was leaking fuel from the fuel return lines from the Injectors.
I found the right hose locally and replaced the lines.
While I was under the hood I replaced the 2 fuel filters... the inline and the canister. The canister one looked slightly bigger diameter (Its a Mann 817/3), than the one I took off, but the seal surface was the same diameter and I was told it was the right one. The only thing I noticed now was the filter did not come with new bolt seals or a crush washer for the head of the bolt...

The inline was installed with the arrow on it pointing toward the pump, and it seemed to fill with fuel.

Now it wont start....
Thinking I did something wrong, I swapped the old filters back in..
No start still.
I was worried that I was low on diesel as the gauge was almost on empty, so I put 5 gallons in.
Still no start.
Am I missing something?

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2009 Mercedes ML320 Bluetec