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You could check for fuel pressure at the injection rail assembly, especially if there is a Schrader valve on the rail. The Schrader valve looks like an air valve and operates the same way. Push in on the valve stem to see if fuel comes out under pressure. Have rags around the valve to catch the gas. Best is to attach a pressure gauge to the valve, and then you can read the pressure. Possibly Auto Zone or Advance will the gauge as a loaner. This will comfirm the fuel pump is working and providing the correct pressure.
Not sure about what engine you have, but here is the general procedure.
Open the hood. Disconnect the negative battery cable from the battery.
Look on the front of the engine and find the fuel rail. The fuel pressure regulator is on the right side of the fuel rail. Follow the fuel lines toward the firewall until you come to a Schrader valve with a black cap. Rotate the cap counterclockwise and remove it from the valve.
Wrap a shop rag around a small flat-head screwdriver and press the center pin in the Schrader valve - you have relieved fuel pressure when no more fuel comes from the valve. Install the cap back onto the Schrader valve. Hope that helps.
you will need a fuel pressure gauge remove schrader valve cap on fuel rail under hood then screw the fuel pressure gauge to schrader valve use a rag around fitting to catch fuel spill.when you check fuel pressure just turn on ignition few seconds dont start engine just turn on ignition just to build up fuel pressure.
Check fuel pressure regulator make sure vacuum connection is attached and it has vacuum also many of these vehicles have plastic fuel lines make sure the fuel line is not crimped or crushed forward of the fuel filter
Check Fuel Pressure. First turn key to on position (without starting) and listen for the fuel pump motor. If no motor sound, your fuel pump is not working. Check fuel pump fuse and relay. If fuel pump works, check for pressure at the fuel rail (schrader valve on fuel rail for pressure testing). If no pressure, or not enough, fuel filter might be clogged or fuel pressure regulator may not be working properly. IF fuel is not the problem, start checking electrical, such as ignition control and proper spark to plugs.
I believe the schrader valve for checking your fuel pressure can be seen looking from the passenger side of the engine. It is on the fuel rail, which is installed between your lower and upper intake manifold sections, about the center of the fuel rail.
if you open up the hood and find your fuel rail you should see a little cap just like what is on your tire valve stems. take the cap off and push the little valve in the center agian just like the valve stem on your tire. be vary carefull as fuel will spray out of this. that is how to depressurize the fuel system
DID you put in new gas, fuel treatment, new sock on fuel pump, all new fuel filters, buy inline fuel pressure gauge, check for codes?, this is not a carb where you pour fuel at it , do you have a repair manual for your truck and have you checked troubleshooting guide?