Yes the fuel pump should always be on when the engine is running, but when it's first started you usually hear the fuel pump run for a second then it stops. I went ahead and changed the fuel filter and found a little water and trash in the filter. I removed the fuel tank, cleaned it and installed a new fuel pump. Fuel pressure is over 30 PSI and it still has a hard timestarting. What stops the fuel pump from running when you first crank the engine? I noticed when I turn the key on and the fuel pump does not stop running, the truck has a heck of a time starting. As soon as the pump stops when the key is on, the truck starts right away. The check engine light does not come. So it is not putting out any codes. Suggestions? Thanks!