1996 Mercedes Benz E320 W210 chassis No Start issue. The car sat for over a year and a half roughly and would not start. We finally got it running and then all of a sudden it just died out again. We had flushed the fuel system, we had changed out the fuel filter. We were troubleshooting everything, but we could not find the fuel pump relay. So here's a short vid on how we managed to check to see if it was actually the fuel pump or the fuel pump relay, and where to find it.
