50 to 60 psi
The fuel pressure relief valve is located Under the Plastic cover on the fuel rail.
Its located on the fuel rail, on the right side of the engine.
The 2001 Chevrolet Silverado-1500 runs on regular unleaded.
The 2001 Chevrolet Silverado-2500HD runs on regular unleaded.
That would be the electric switch that is mounted to the top of the fuel sending unit on the top of the fuel tank. You will either have to raise the bed are remove the fuel tank to get to in.
You will need to replace the fuel pump and filter, The fuel pump is what makes the pressure.
A fuel pressure test will help determine the condition of the fuel pump and fuel pressure regulator provided the fuel pump electrical circuit, fuse and relay check okay.
50 to 60psi
On the fuel rail--on the driver's side of the motor...