P0087 code after doing head studs

[snowwhite3.3]

Just finished up the bear of a job, that is the head studs. I reassembled and got my first start. It started hard and I figured I just had air in the fuel system. Took it for my first test drive and I wasnt making boost. I drove to the gas station to fuel up since I was low and I thought it would help purge any air out of the system. When I started to the car after that I got the p0087 code aka "fuel rail pressure too low". I did install high flow downpipes and already have catless secondaries. Not sure if it could be a tuning issue with the increased air flow or not. I also found a glass fuse underneath my car that im not sure what its from. I will add pictures of the fuse as replies to this post.