|Great info! I think on my 1993 Buick 3.1 the regulator is under the intake tho?
|Yes, on the older models the fuel pressure
regulator is located under the upper intake
|What should the pressure be on These? i have a 2005 Monte Carlo ls with
the 3.4 and I'm reading 30 only when the engine is running. At any other
time the pressure is zero.
|I think the fuel pressure should be about 45 PSI running. With engine off, if
you are showing nothing, then it sounds like a bad fuel pump.
|55psi for start up, 49psi-52psi at idle, as high as 58psi through operating
range is normal
|What should the pressure be on a 2003 Buick Century?
|A good rule of thumb is 45 PSI.
|I have the 3.1 v6 Chevy Malibu. I took the hose off for 3 mintues, didn't see
any fuel come out to suggest a problem. However, whenever the hose is
put back on, I can hear humming while I'm sitting in the car with it running. I
take of hose, no hum. Strange? Should I replace the regulator. Note: Just
did fuel pump 4 days ago because it failed, also did fuel filter and pump
relay just as a precaution. BTW, the sound is not coming from the back or
the fuel pump, but in the front.
|If this is an older 3.1L, then yes, replace the
fuel pressure regulator. There was a design
change years ago for making noise.