Apparently the other side of the IP diaphragm is not vented to the atmsophere, but is seeing crankcase pressure.

Can we get Larry Bible in on this? I've never seen a Bosch schematic of the IP to know one way or the other.

BTW Bwatson and all the rest of you-
The tech that showed me the blowby trick also showed me how to isolate a bad injector. Start the engine, and lightly touch each of the steel fuel injector lines. a clogged injector will have a stronger pulse to it that a healthy one. On my 300DT, it's #3, and it's easy to feel the difference. In my case, I'm also getting a clicking noise, though the valves are within .001" of spec. He advised me to run a can of Diesel Purge, and swap the injector if that will not work.

This guy is a gem-- He could have charged me for this, instead he taught me something new..

Regards,
Nate

__________________
Nate Stanley
(Currently Benzless)
1985 F-250 6.9l 170K
2009 SCION XB 36.5K
2003 LS430 78K
2012 Kubota B 2320