Thanks Mrkybenz

That method still keeps the o-rings, I was thinking of the fuel filter housing being made out of aluminum. It could possibly be tapped and brass fittings put in. Thought there might be an older version with metal fittings that would work.

I'm thinking of, just ordered one, installing the old style in-line filter to eliminate the existing prefilter plumbing.

My routing would bring the fuel line to behind the headlight assembly through the old style prefilter and direct to the fuel pump using that method you pointed me to. This would also eliminate the fuel heater, but Texas is hot enough that shouldn't matter.

Doing this would eliminate 3 of the o-ring connections, plus the prefilter would be visible for checking.

If I can find/modify a filter housing to have metal fittings that would just leave the fuel pump inlet and outlet with o-rings, plus the tiny o-ring on the banjo overflow bolt fitting. I trust good hoses, fittings, and clamps much more than o-rings. I want to travel quite a bit this year using the Mercedes, don't want to have preventable problems if I can avoid it.

Found my fuel leak source today, there is a very tiny crack in the black plastic, visible by putting a little pressure on the fitting.