Jason, there are tons of threads on both OVP and fuel pump relay on the forum, you just need to spend a little time with the search feature.

I included the engine speed sensor in the list of possible suspects, because a loss of TDC signal of just 1 second shuts off the fuel pump relay instantaneously. It's like someone reached over and turned off the ignition key. That's a fire prevention safety feature in case the vehicle was involved in a collision as the reason why the engine speed suddenly went to zero. Of course, with a malfunctioning sensor, the car doesn't know that you weren't involved in a collision, so the fuel power supply is immediately cutoff via the pump relay.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't