stalling issues agian, any suggestions
 

So the stalling has begun agian. car is a 1991 190E 2.6.what Ive done and replaced:

-new ovp
-reman mas from programa
-Checked fuel pressures-system pressure @ 5.4 bar
-lower chamber pressure at 5 bar
-checked for leaks-none
-checked wiring to eha, micro switch, air flow sensor
-checked air flow sensor
-holds pressure
-checked pcm and wiring to the eha, microswitch and air flow sensor
-checked for vacuum leaks
-checked fuel pumps
-check coolant temp sensor
-checked eha

Also the problem only happens when the reaches operating temp or near operating temperature and when it happens i hear a loud rumbling in the gas tank like there is air in system. it just started doing but for a few weeks the car ran great. seems to me if it was the crankshaft postion sensor it would be doing it when the engine is cold as well.

I worked on it today and found a few red flags. first the fuel pressure didnt change when i performed the decel fuel shut off fuel pressure test and the acceleration enrichment test. The fuel pressure should change when i do this which narrows the problem down to the EHA, control unit, microswitch and TD signal and air flow sensor plate. Out of those items mentioned i elimnated the pcm, microswitch,air flow sensor plate.

Any other ideas as to why its stalling only when the engine is warm and why I am hearing rumbling in the gas tank? Ive done what the MB TSB has you do when you have this issue.