fuel pump

I have a Worcester Bosch boiler with a Riello burner. The boiler became sooted up and blew up damaging the door to the combustion chamber. I have cleaned out the chamber and all other sooted areas. Now I can get it to run from cold but once it reaches temperature and turns off it will not...

After replacing what I believed to be a dead battery my car is once again dead. Jumped it and runs fine however when switched off can hear an electrical humming sound from under the car, disconnected the battery and noise stops so assuming the fuel pump relay has gone. However for the life of me...