s...1999

Alright guys and gals, I haven't posted much on here but I have a huge issue going on with my S. bought the car boosted and tore it apart to rebuild. After a year and some change everything is back together and I'm ready for start up. Well, it cranks but I'm not getting any fuel pressure. So I jump on here and find a few different threads about the main relay and some other things. So I replace the main relay under the dash and I'm still not getting anything but it's hissing. The fuel pump isn't priming but the main relay stays hissing the whole time the key is in the run position. I'm at a loss so any and all suggestions would be helpful! Thanks everyone!

AJVH2000

Do you have power at the pump? How long was the car sitting?