Just thought I'd ask the pros here about this. I've been told that it is bad practice to run fuel injected gasoline cars close to empty as the fuel pump needs the extra gasoline for cooling purposes. Specifically, the guy that explained that to me was referring to my Toyota Corolla.

My question then is, why is this so? He wasn't able to explain it, but said that he was told so by his mechanic. And does it apply to M-B gasoline cars like my '84 500SEL and the diesels as well?

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1999 Mercedes-Benz S600, 103K miles - garage queen
1988 Mercedes-Benz 560SEL, 89K miles - daily driver
2007 Hyundai Sonata Limited, 31K - daily driver