Typically speaking, an electric fuel pump runs as long as the engine is running. Some of the newer cars use a PWM "duty cycle" to control the speed of the pump, but it will always be running.
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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)
Black Sheep:
1985 524TD 167K (TotalDumpster™)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
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