From 87 to 95 did not have them. You will have to crack the fuel line alittle to relieve fuel pressure.
9 to 13 LBS. ( PSI )
Remove the gas cap first. You may also find a schrader valve on the fuel rail that will relieve pressure.
There isn't a fuel shutoff valve.
It controls / regulates the fuel pressure.
On the fuel rail ( there are 2 fuel rails that connect to the injector bodies on v-8 cars, only 1 will have the valve) there is a small Schrader valve, if you are familliar with putting air into tires this valve should be easily seen. Take the valve cap off (don't loose it though) and attach a fuel pressure meter, these can be bought or in some cases rented from auto parts stores then start and run the vehicle with the meter attached, fuel pressure varies by model and engine size so be sure to look up the correct fuel pressure for your exact engine and year. If your fuel pressure is off you should start by replacing the pressure regulator, not the fuel pump.
On the fuel rail of the 93 explorer there is a pressure valve. With the battery disconnected, place a rag around the valve to catch any fuel. depress the valve until the fuel stops coming out.
under hood, on fuel rail which is connected to each fuel injector there should be a valve that looks like a tire valve. That is the shrader valve, test fuel pressure there.
Take off the gas cap, look for a schroder valve on the fuel rail. If it has none then wrap the filter connection in a rag and be prepared for a sudden spray of fuel when you loosen the filter.
the "valve" stem fitting you're referring to is called a schraeder valve , and is for connecting a fuel pressure gauge to, as a means of checking your fuel pressure-typical fuel pressure should be about 35 psi.
there should be a valve on the fuel rail on the engine that you release the pressure, it looks just like a tire valve.
you hook up a fuel pressure guage to it to check the fuel pressure