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Find your test valve on your fuel rail (under the hood) and you will need a fuel pressure regulator gauge to check the pressure. You can also look up online the specs for the pressure recommended. You did not provide your size engine so i could not look up specs for the pressure. Hope this helps.
Check fuel pressure at the rail. If it's not within specs, check the pressure relief valve on the fuel rail - the one that feeds fuel back to the tank.
If the pressure IS within specs, it's time to start seriously suspecting the car's computer.
With a fuel pressure gauge. If there is a test port called a schraeder valve on the fuel rail on top of the engine, it's easy. If no test port, you have to tee off the fuel line somewhere convenient (like right after the fuel filter) and hook your gauge up there. Hook the gauge up, make sure of no leaking, turn key to on, and read the pressure (it will read the same pressure in the line as at the fuel rail). Check pressure with key on, and then with engine running- if at the specs for your vehicle, it's good. If pressure is below specs, pinch off or pull off the vacuum line to the fuel pressure regulator, and see if pressure raises. If it does, try another pressure regulator. If no change, check the fuel return line for restrictions, check or replace the fuel filter, or suspect a poor performing fuel pump. On MPFI systems the pressure should be about 50 psi, but find the specs for your vehicle.
easiest way is to use a fuel pressure gauge that will connect to the fuel rail and read the pressure coming from the pump. You will need to know the spec pressure for your car. Follow the instructions for connecting a fuel pressure gauge to the fuel rail. Careful to clean up any expelled fuel on the engine. Turn the key to the on position and wait for the pump to build pressure, normally about 2 seconds, and read the gauge. Compare the gauge reading to the specs and determine if the pump is delivering the required pressure. You can rent a fuel pressure gauge from many automotive parts stores if you don't have one.
2001-2004 gmc sonoma 4.3 [X, W Eng.] fuel system specs: 60-66 psi when you turn the ignition key (fuel pump) on without starting the engine. If fuel pressure drops back down quickly after fuel pump stops working (works for only 5 sec.) then you have a bad fuel pump or leaking injector spider.
check the fuel pressure....there is a valve near the fuel pressure regulator that u can connect a fuel pressure guage to.under the hood on the right in the area of the brake master cylinder( right upper corner...( a line with a threaded valve)..check the reading and make sure they are in specs, i dont know the specs off hand but a service manual will help..if the pressure isnt in spec, replace the fuel pressure regulator..
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