fuel pressure with vac is 30-45 psi/ without vac 50-60 on my 94 engine, i dont think it varied to your year, but if u go to the autopart store and look in their CHILTON book it will tell u for sure.
The fuel pressure regulator maintains 41 to 47 psi to the fuel injectors.
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.
fuel pump maximum output pressure is 64-85 psi however the actual operating spec with fuel pressure regulator vacuum disconnected is 34-40 psi.
you probably need a fuel pressure regulator it should be around 35-45 psi
according to the haynes manual the normal operating pressure for the n/a fuel rail should be 48 psi. If it is below that, you have a bad fuel pump. If you unplug the regulator vacuum hose and the fuel pressure goes above 58 psi, your regulator is shot.
install a fuel pressure regulator and set it to 36 psi idle in a stock motor
With vacuum line (from fuel pressure regulator) OFF and pinched , pressure should be between 47-54 psi. With vacuum line ON fuel pressure egulator, pressure should be between 38-46 psi.
38-44 psi with pressure regulator vacuum hose disconnected and plugged
The fuel pressure range for a 99 Astro van is between 40 and 45 psi. The fuel pressure regulator is located at the back of the motor.
There is no adjustment, it is preset for 41 to 47 psi.
You should only have 44 psi at WOT - maybe you have a faulty fuel pressure regulator.
It is attached to the throttle body. Pressure should be 41 to 47 psi.