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I think your after the fuel pressure check valve or regulator. This model doesn't actually have a fuel pressure sensor.
The regulator is on the centre of the manifold at the end of the fuel rail.
The check valve is right next to the PVC valve which is also at the centre of the inlet manifold.
Let me know if you need more information.
If this is the 4.3 liter the fuel pressure regulator is located in the intake valley. You will need to remove the upper half of the intake manifold, once removed you will see a small round regulator located at on end of the injector line.
If you mean your fuel pressure regulator. It's located on the CSEFI injector assembly, the regulator is located under the air intake plenum on the back of the fuel meter body. If the regulator is bad it may cause either a drop in fuel pressure or an increase in fuel pressure at the rail . A drop in fuel pressure, if severe enough, can cause bad or no idle condition, engine starving for fuel and etc.
If the regulator is causing excessive pressure it can cause fouled plugs, black smoke from exhaust and rough engine performance. Before you change the regulator check for cracked, rotted or disconnected vacuum hose.
Also you can connect a fuel pressure gauge to the schrader valve on the rail and monitor the pressure to see if it is in specifications, or to see if the fuel pressure drops rapidly after engine shutdown.
Hope this helps and good luck with your project. Thank you for using Fixya
This fuel pressure regulator is a component part of the SFI (sequential fuel injection) assembly, sometimes referred to as "spider". It resides inside of the air intake plenum and is accessed by removing the upper half of the intake. Good luck and hope this helps. Most of the time when your having problems, it's most likely going to be the whole spider unit. GM has been know to have problems with this type of fuel injection system. Check the vacum line to the fuel pressure regulator at the back of the spider housing by the high pressure fuel line. You can see it just in front of the distributor cap and spider assembly.
i been having fuel injection troubles myself and seems to me your problem may be your fuel injection pressure regulator,before starting when you turn the key so your dash lights show up and at that same time you should also hear your fuel pump motor spinning which means that its working and sending fuel through so you may have a fault with your regulator,,hope that helps,goodluck.