every once in a while my truck will sputter and choke and lose all power , then i switch to either the front or back tank and then my truck runs fine. until both tanks do that. i replaced the filter and the fuel pump relay sensor, i pulled the front tank and it was spotless in side. sometimes my truck acts up and sometimes it doesn't but when it does it leaves u stranded for a period of time. when it stops the motor makes a thumpin sound and like kicks. not sure if i should replace the lines or just the pumps. need help maybe its something electrical like my tank switch or .... ? but my pumps are 180 each so i don't want to just start throwing money away. any help would be nice.