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Update, neither M35A2-AZ or I could find an IP filter screen in our NHC250 VS wrecker IP's. After cleaning my fuel tank, changing the large driver side fuel filter, the hard diesel knock resolved itself. The motor starts immediately but has a lag on run up. The original fuel filter can was badly...

Thanks to Swamp Donkey, both M35A2-AZ and I located 2 possibilities on the bottom of our pumps. Mine has a small diameter flush mount hex plug on the very bottom of the pump. Further back and upwards there is a machined recess with what looks like a 7/16" hex bolt. That would seem to be the...

I'll look again but we didn't find one during our search. Maybe its flush and painted over? Thanks for the diagram :0)

Happy Sunday all! I have a M936A1 wrecker with NHC250 motor. Long story short, one fuel tank was contaminated, pretty much overcame the frame mount filter and the PT pump and engine ingested the contamination. The motor had a severe "diesel knock" and ran very rough. I've cleaned the tanks...