1999 Mercury Mountaineer Cant start 99 Mountaineer

Hi, Just stick with me. Recently my fan belt fell off due to a bad tensioner. I replaced the tensioner and water pump since it cracked, got the belt on and everything bolted up. It wouldnt start up so I got it jumped. It ran for about 45 min. Drove it around the block, parked it and went upstairs when I came out it was off and wouldnt start up. I replaced the battery thinking it was that but got the same result. Turns over really good but just doesnt start. Some people have told me to check the crankshaft sensor cause the belt may have damaged it. I checked it with a dvom set. Got good readings. Checked the fuses and looked at all electr. Cords. Im ata loss and just wanna know where to start next. Thx in advance