1992 Mercedes Benz 300e stalling

It could be the FP relay, but more than likely, it's the fuel pump itself breaking down from heat and stalling. Once it cools down it'll go again for a while, then do it again. Hope this helps. A fuel pressure test when the stalled condition exists will confirm this.

The car has 2 fuel pumps, one in the tank and one outside. It just doesn't seem right to me that a electric pump would run perfect for a time and then quit. Also, I drove the same car 2 weeks ago for 20 miles and it never did quit, then next time I drove it, quit after warming up. I thought electric pumps either worked or did not work, but not sometimes yes sometimes no according to temps? I read on the forums that hundreds of the same cars had the same problem, replaced pumps, relays, CO-2 units, MAP units, overload protection relays and spark plugs, rotors and wires and STILL have not cured the problem. I cannot afford to replace every electronic unit in the vehicle (after only 88K miles) @300 to 500.00 per part just to "try" it. I am looking for someone that can tell me the problem and cure clearcut and concise?

Well, if "hundreds" of the cars like yours have the same problem, are you telling me that no one has come up with a solution?
I'm going to put you back on the post list and maybe someone else can help you.

Yes, there are many people with similar cars with the identical problem, nobody has found the problem yet, albeit many have tried. That's why I went to you people. Hello, anybody home? The fix you suggested was tried many times by others with zero results, I am just trying to get to the bottom of this. Mercedes denies this is happening, but we all know it IS! If you cannot tell me what it is, please say so and I will keep searching. It has to be electronic! Most likely so far is the "crankshaft positioning sensor" one person on the forum said he replaced his and the problem (stalling out after warming) has dissapeared. No matter which forum you go to, for Mercedes, there are people with this problem from 1980 to 1995.

I'm going to put you back on the poster board 'cause "I" don't want to deal with you!!!!!

Which only means you have no clue of the answer. I have been to auto sales dealer and he gave me better information than you did, now I wish i never sent you any money, you did not earn it.