ok so i have a 1996 ford f250 7.3 power stroke and a few days ago i was driving and the engine started sputtering like it was not getting enough fuel. i pulled into a parking lot and it died completely. at first i thought it was the CPS (cam positioning sensor) because it died as soon as i made the turn into the parking lot but after i got it started again i did a few hard turns and it was fine. so thinking it was just some isolated problem i continued to go home only for it to sputter out again after a few miles of it running fine and i had to get it towed back to my house off of the side of the road. is there any way to test if the fuel pump is bad or should i just buy a new one and replace it? how easy is it to replace? any help would be amazing!