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?
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) evilplastic.com ]
MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.