Solved P0171 code, fuel pump? thoughts comments?

[bichon]

I had the PO171 for a few months. Turned out to be a very loose spark plug at #2 . Tighteded the plug and no problem since.

 

[Xoc8]

I have a 2005 explorer with the code p0171. I drive a half hour and it dies. Let it rest for a while it starts up, I changed the fuel pump and it's still dying, it says low oil pressure right before it dies, any solutions?