1991 190e 2.6 Fuel Pump

[Jeff72_220d]

I need help in removing the fuel pump from a 1991 190e with 2.6 engine. I know the tank is behind the rear seat. How do I access the pump(s)? The parts dealer websites all say that there are TWO fuel pumps. Is this correct. I have traced the non-delivery of fuel to the injectors. (I disconnected one injector line, and tried to start the engine - no fuel comes out) Could there be other problems that prevent fuel delivery, other than a bad pump?

Thanks for your help.