Found the problem with the 850 and cutting out.Rechecked a data for codes none found.What I next did was remove the fuel pump relay and disassemble and found tow bad solder connections and replaced with new relay and road tested and everything works perfect. This is common with 240 relays ,but this is the first time with this 850. TER

I did the exact same thing weeks ago. For the first time ever, my car stalled with no explaination when driving. After doing some research I learned that if no codes are stored (meaning it isn't your RPM sensor) then it has to be either a faulty fuel sender or faulty fuel relay. I replaced the relay and the problem has not returned. Yet. I opened up the old relay and was surprised to find a busy looking circuit board complete with chip! In a relay! There was what appeared to be a cold solder point which is questionable. I have been told that if the problem returns, the next move would be to replace the "main" grey coloured relay found above the radiator area. This relay is like the mother of all relays for the car and has also been known to fail.
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'82 240DL Stock / Masters Class, '94 850 Fully Loaded / Daily Driver, CVC / VCOA Member http://www.capcan.com/tonyg.htm