After I replaced the timing belt it was running fine. I saw that the two motor mounts needed to be changed as well so I did. When I went to start car I dont hear the fuel pump engage and the car only cranks. When you turn the key the fuel guage goes to full then all the way below empty. There is 1/2 tank of fuel. No codes other than that the battery has been disconnected in last 50 starts. What should I be looking at next? or is the fuel pump dead?