Have had Pnuemonia last couple weeks..........After replacing all fuel lines last year, Wife's MB developed fuel leak at outlet of fuel thermostat to the primary fuel filter, probably the oring. Currently unable to properly repair, which would require removing the intake so I jumped out the leak by running a new line from the tank supply line on the right fenderwell to the primary fuel filter inlet. I used the old line fitting after I cut off the short line, clamped it up, problem solved for now. Hope this helps someone out, Andy