facovers

I have a 01 LT blazer 4.3L 4x4 auto with 131,000 miles and I had some strange problems over the winter 1 day she flat would not strat it sounded like it was not getting gas due to weather money and surgey not much was done but trying to get it to start with no luck with warmer waether pumped the gas and she started right up, so I changed the fuel filter and dumped it out and the gas I poured out of it was black problem solved so I thought. 2 weeks later my son reported to me the engine light flashed a few times and went out and now the fuel pump has died after getting her home I pulled the codes and I got po131 and po151 saying bank1 and 2 sensor 1 is having a problem are these related to the fuel pump dying or is another problem as well.

Thanks for your help in advance Steve