Answering "1999 Pontiac Bonneville fuel shut off switch?"
No switch. Check the relay for the fuel pump.
There is none to find.
It is inside the gas tank
It doesn't have a carburetor, it has a throttle body fuel injection system.
where is the fuel pump relay located on a 1992 Pontiac Bonneville on the outside or the inside
If the Bonneville is like my GTP then the fuel filter is in front of the fuel tank
In the fuel tank
Fuel capacity on a 2001 Pontiac Bonneville is 18 gallons.
1994 Pontiac grand am
On a 1994 Pontiac Bonneville SE, the fuel filter is located along the fuel line, typically mounted on the underside of the vehicle. You can find it near the fuel tank, just before the fuel line connects to the fuel pump. It may be necessary to lift the vehicle for easier access. Always ensure safety precautions are taken when working underneath a car.
I have a 2002 beetle with a TDI and the filter is black a located on the passenger shock tower.