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38-44 psi with pressure regulator vacuum hose disconnected and plugged
From the HAYNES MANUAL: With regulator vacuum hose attached: 31-38 psi ::: With regulator vacuum hose disconnected: 40-47 psi.
43 PSI with engine at Idle with Fuel Regulator vacuum line disconnected and plugged.
It doesn't have a vacuum line attached to the fuel pressure regulator.
fuel pump maximum output pressure is 64-85 psi however the actual operating spec with fuel pressure regulator vacuum disconnected is 34-40 psi.
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.
with the vaccum pipe disconnected you should have 2.8bar (+-0.2) of fuel pressure in your rail, when you reconnect the vacuum pipe the pressure will decrease as they using a rising rate fuel pressure regulator which is controlled by the manifold vacuum, http://megaflea.net for more car tips
At idle or deceleration.
Most likely cause could be the fuel pressure regulator located on injector rail with vacuum hose attached to it. This vacuum hose when disconnected after the engine has been shut off 15 minutes should show signs of fuel indicating a bad regulator.
NO. When a engine is running it makes it's own vacuum. That's why there is no vacuum hose on that year regulator. It is inside of the engine.
there is no fuel pressure regulator " sensor ", there is a fuel pressure regulator controled by vacuum located at the front end of the fuel rail.
There isn't a vacuum line going to the regulator on a 1998 Dodge Caravan.