my car was hard to start then my fuel pump went out. then we changed it the car started but still was very hard and started to back fire didnt do it all the time just once in a while. why do you thnk this is? also now my fuel pump was changed again it started back up like right away drive it for two days and it just stop running again.now what do i do.is there something else i should be looking at or is there something thats making my fuel pump burn out.also my check engine light is on but has been on for ever like 2 yrs.i need some answers someone please help!!!!