41 to 50 PSI, I have spent a lot of time figuring out a problem with ours.
how do i change the starter on a 1997 olds 88 royale?
18 Gallons.
If the car is fuel injected (not sure for 1991) then the fuel pump is in the gas tank.
wiring schematic for a 94 olds 88 royale
You must drop the fuel tank to access the fuel pump.
45-65psi
Pretty sure it's in the tank.
On an Olds Cutlass 2.8, the fuel pressure should be between 40 and 47 psi with the engine off. With the engine running, it should be between 30 and 44 psi.
Under the car, behind the driver.
41-47 psi
Check under vehicle along frame rail--follow the fuel line from the tank
Need to check FUSE for the fuel pump in the fuse box. And you did not say what you are working on.