I've been having a problem where my truck just stops running as I cruise along, and won't restart. The next day when I get a mechanic to look at it, it starts right up and runs just fine. Sometimes it'll have an irregular idol, I shut it off restart and it's fine. Most of the time it will only start off the front tank, sometimes it'll start off the rear tank. It's giving me a fuel pump secondary circuit fault code, and a neutral pressure switch fault code. However my issue doesn't match the symptoms for those issues.

​​​​​​Any ideas from the masters in here? It's a 94 f250, with a 351

 

Because some folks misinterpret codes , please provide the codes you received.

Also, what checks were done and what if any results were obtained, thanks.

Would you know what checks regarding fuel and spark were performed?