HI forum. I posted earlier about engine idling rough. I have 1995 chevy blazer vortec with 175,000 miles. I just checked the fuel pressure and with key turned on it jumps to about 60 psi. After about 3 seconds the pressure starts to decrease very rapidly. Pressure holds at about 10 psi. with key just on. With engine running it holds at about 52 psi. Does it sound like I need a fuel pressure regulator ?

 

I'm not certain, but it sounds OK to me.

 

You really should have put this in your previous thread...

But yeah, your fuel pressure should not decrease after the key is turned off, atleast not that much. That signifies a pretty good leak in the fuel system somewhere. I would start by pulling off the upper plenum, pressurizing the system and looking for leaks.