Very Expensive Preventative Maintenance

For anyone that will be replacing the drive belt on a Ford V-10 anytime soon: If you happen to remove all the plastic trim and air filter housing, etc., please be aware of how you put it back together. I recently took a trip and when I got on the highway, I hardly had any power. I could barely get to 60 and could not muster up enough speed or acceleration to pass anyone. I would slow down considerably on overpasses. I unhooked the Jeep to see if it improved. It didn't. I figured it must have been the fuel filter. I stopped at the nearest Auto Zone and they sold me a fuel filter for a 2010 E 450. I get out in the parking lot and could not find it. I checked the manual and it said that the filter was located in the tank. I guess the guys at Auto Zone didn't know that. I went back inside and returned it. Got it home and ordered a new fuel pump assembly since you can't order just the filter. Dropped the tank, replaced the assembly and back together. This was not an easy task by the way. I let it get down to a quarter tank. I can't imagine if it had been full. Anyway, I took it on a test run. It seemed better, but not much. I got out on the highway and things did not improve. I pulled over to disconnect the battery to see if resetting the computer would help. While the battery was disconnected, I decided to check the air filter just in case although I had recently replaced it. I removed the first section of the housing. When I went to put it back on, it would not go on quite right. There was a flap that was positioned the wrong way almost blocking the entire intake. I corrected the flap, reassembled everything and got back on the road. It ran perfect. Oh well. At least I have a new fuel pump that should last me for quite a while now.