Golf7 failure

Hello good I have a problem with a golf7 in case Algien knows what it can be, I put diagnosis machine and leave P304300 (mechanical failure fuel pump) the fact is that the bombing bomb is new and original of the Volkswagen but it continues to give me the same error, I also get on the screen of the car error Start -st Of life, the 70ha agm battery but I remain the same, having if anyone knows what can be, thanks.