no vacuum at throttle body to control pressure regulator

Discussion in 'General Motoring' started by nickdel, Jun 15, 2006.

  1. nickdel

    nickdel Guest

    At the port on the throttle body that leads to the pressure regulator,
    there is no vacuum at idle, as indicated on my pressure guage (I think it
    should be about 18in.). When the butterfly valve is opened, the vacuum
    acts accordingly. Any ideas?
    nickdel, Jun 15, 2006
  2. nickdel

    Lane Guest

    When I've put my finger over the hose leading to the pressure regulator at
    idle, I've noticed VERY little vacuum. Since it is this way on both of my
    Saturns, I've assumed it was the way it normally operates. When the
    throttle is opened, vacuum increases substantially and causes the regulator
    to 'obstruct' the fuel return path (in a return system) to increase the fuel
    pressure in the rail.

    Lane [ lane (at) ]
    Lane, Jun 16, 2006
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