Fuel not getting to engine

The other day was driving the car and it just died got fuel presure errors and got it towed. Last day changed HPFP still didint fix the problem. So today I got used fuel pump control module( idk how its named for sure) now there is fuel coming ro HPFP but still no fire. Went to check voltage coming to HPFP and got only 6v. And im lost here. Check all fuses in trunk and under the hood. Does it need to be 6v or maybe i got bad control module and need another one. Please somebody help. Its F36 with N20