Yes, on a 4.3L engine it is located under the upper intake manifold, attached to the bank of injector poppets aka "the spider".
In the gas. Of course.
pressure relief valve relief the excess pressure which is developed in the syatem, while pressure reducing valve reduces the pressure and supply it to the system.
The high oil pressure relief valve is located in the oil pump
The 1994 S10 has a fuel pressure regulator located in the throttle body.
From 87 to 95 did not have them. You will have to crack the fuel line alittle to relieve fuel pressure.
pressure-relief valve
The relief valve is part of the oil pump.
The fuel pressure relief valve is located Under the Plastic cover on the fuel rail.
The pressure by pass is located on the adapter that you screw the oil filter to.
If your pressure relief valve is adjustable, you increase the pressure relief setting.
Converter relief valve ensures high line pressure does not flood/overrun the solenoid.
Make enquiry's with the manufacturer of the compressor and get the max pressure rating. Then let the pressure in the tank build up to that level. If it does not open get a new valve