[W126 Coupe] 1988 560 SEC loss of power

[GreyGarageRuss at aol.com]

I  follow this list daily and now have a problem with my 1988 560 SEC which 
I could  use some advice on.  Twice in the  last two weeks while driving my 
car lost power.  Each time the trips were at highway  speeds and after 
about 1-1/2 hours of driving.  On each occasion, the fuel gage was  close to the 
“R” (reserve tank ) level. The car lost most of its power (like  running 
on 4 cylinders) but did not stall.  I was able to get over to the curb lane 
at about 15-20 mph.  I turned the ignition off  each time, waited 4-5 minutes 
and  restarted….it then ran fine. 
I have  had two mechanics look at it but no solution.  Both suggested fuel 
supply problems but  the two fuel pumps were checked and appeared to be 
functioning properly.  They also suggested a fuel sensor  problem but were 
unable to check sensor while problem was not  happening. 
Other  suggestions included: blockage in muffler system or catalytic  
converter! 
Any  advice would be appreciated. 
Russell
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