For instant check of how the fuel pressure is , plumb in a cheap guage at the fuel rail test point in the engine compartment. A little rubber hose, a fitting or two, a couple clamps and an inexpensive gauge.... lash or mount gauge to location of your choice where you can view it in the engine compartment. I put one in a couple of weeks ago just for the purpose of instant trouble shooting.
See:
http://www.gaugestore.com/060psiwikgau.html
for an inexpensive 0 - 60 psi gauge that works fine.
- Dave