Sounds like Poos sold you a POS.
Sent from my iPhone
> On Feb 6, 2021, at 1:51 PM, Meade Dillon via Mercedes <mercedes@okiebenz.com>
> wrote:
>
> I bought this '95 E300 from Dan a couple years ago, and it had a fuel leak
> at the fuel filter holder when I picked it up. There are five different
> hoses that connect to this assembly, all use o-rings to make the seal, and
> one at the top center was leaking. It was a slow leak, Dan thought maybe
> the filter holder assembly itself had a defect, so he'd already purchased a
> new assembly and it came with the car.
>
> I bought a thicker o-ring, installed that, and it seemed to solve the
> problem. Until it didn't. A few weeks ago I noticed the smell of diesel
> fuel wafting from under the hood ("Say, is that diesel fuel I smell?" said
> somebody's girlfriend on Kaleb's website as she smiles into the camera). A
> couple days later it had turned into a gusher, and I had not even been
> driving the car. Big pool of diesel under the front bumper.
>
> The leak had returned with a vengeance. Engine running, the middle hose
> connection would pulse in and out. OK, time to swap in that new assembly
> and some new o-rings, right?
>
> I scrounged around for about 30 minutes until I finally found my stash of
> spare o-rings for the OM606 non-turbo fuel system, and then removed all the
> fuel lines from the filter holder. Loosened the center bolt / valve
> assembly (that holds the big main filter in place) and then removed the
> bolts that mount the fuel filter holder in place on the head. Lifted out
> the filter and holder, and finished removing the filter on the workbench so
> I could hold it upright and not spill anymore fuel. Replaced all the
> O-rings, and then got out a new fuel filter and noticed something odd as I
> compared it with the old. Old filter, with the MB star mark, has the
> center rubber seal just glued to the top of the filter, and it was in two
> pieces, floating around the top of the filter and obviously not sealing
> anything. New filter (Mahle) has a steel lip folded over the center rubber
> seal, keeping it in place.
>
> I suspect that the failure of that center rubber seal meant that the filter
> wasn't filtering anything, and so the pressure of the flow from the lift
> pump was going directly to the outlet line and that was too much for the
> o-ring to seal. I think if I had just replaced the big filter, the leak
> would have been solved.
>
> Put it all back together and fired up the engine, leak is gone.
> -------------
> Max
> Charleston SC
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