For your 1994 Chevrolet TRUCK ASTRO VAN 2WD: FUEL SYSTEM PRESSURE 9-13 PSI(POUNDS PER SQUARE INCH) You can find this stuff free at autozone.com under specifications.
it is part of the fuel injector which is under the upper intake manifold
the fuel pump is in the fuel tank--which is located about half way back on the drivers side...
The 1994 S10 has a fuel pressure regulator located in the throttle body.
inside the fuel tank, tank must be removed
made into the cmfi
The fuel pressure regulator on that 94 Chevy V6 is in the throttle body.
It's part of the fuel injection assembly inside the upper manifold.
It might be on the firewall under the hood on the left side.BEst of luck....I to am haveing trouble with astro van.
With the aid of adapters, you can "T" into the fuel line at the fuel filter and attach a fuel pressure gauge.
It is located in the throttle body.
We are going to need to know what engine it has.
From 87 to 95 did not have them. You will have to crack the fuel line alittle to relieve fuel pressure.