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on the fuel rail. Looks like a silver bell, with a vacuum line attached to it.
It doesn't have a vacuum line attached to the fuel pressure regulator.
underneath the engine cover on the drivers side. It's connected to the fuel line right before the fuel rail to the fuel injectors. It has a vacuum line attached to the top of it.
GM likes to put these on the ends of the fuel rails--- look there. If you see a device connected to the rail which has a vacuum hose attached to it, that's it. jb
At idle fuel pressure should be 30-37 psi.At WOT or without the pressure regulator vacuum hose attached it should be 38-46 psi.
Attached to the end of the fuel rail (pie that connects to the injectors) there should be a round metal thing with a vacuum hose attached to it. This round thing is your fuel pressure regulator. Do not disconnect the vacuum hose with the engine running if you suspect a bad regulator, as fuel may spurt of if the diaphragm leaks and this could be a fire hazard.
On the 4 cylinder engine it is screwed to and part of the throttle body injection unit. The 3.0 litre V6 it is attached to the end of one fuel rail and has a vacuum line and a fuel line attached to it The 3.3 litre V6 it is a little brass coloured pot with a vacuum line attached clamped into the fuel rail.
It is attached to the bank of fuel injectors (the spider) under the upper intake manifold.
the fuel pressure without vacuum is 34psi. and with vacuum 43psi.
IT IS A CAP I JUST HAD TO REPLACE MINE
fuel pressure regulator
Stock base fuel pressure is 42 psi. This is the pressure when the vacuum hose is removed from the fuel pressure regulator. The vacuum hose must be plugged when its removed from the regulator.