I had a problem very similar to this on my '94 SL. I finally tracked it down to the electrical plug that comes out of the fuel pump/sending unit assembly that fits down into the gas tank.
Unfortunately, you can't just buy the electrical pigtail and re-wire it. You have to buy the entire assembly (fuel pump, sending unit, metal bracket, pigtail, etc.).
When I replaced this entire assembly - I never had the problem again. Of course the cost was in excess of $500 or so.
I suppose I could have re-wired a new circuit to the fuel pump, but I didn't really want to start cutting up the exisiting factory wiring harness.
Archie
Topeka, KS
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