Sounds like you may have air in the system. A little air bubble in the prefilter is normal. Check to see how full the perfilter is, and also make sure you bleed the system well after a filter change.

What do you mean by over rev? These cars with the OM617 would do higher RPM if the IP could keep up.

Also check to see if you get a "whoosh" when you remove the fuel cap on the tank. If you get the sound, then your cap is not venting properly and it's time for a new one.

Also check to make sure you have no fuel leaks. Check all lines, hoses, and the primer pump. Sometimes you can have an issue where air is being drawn in, but no visible fuel leak.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D