What is the fuel pressure spec for a 1996 z71 truck?

The fuel pressure specification for a 1996 Chevy Z71 (assuming it has the common 5.7L Vortec or 4.3L engine) isn't a single, readily available number like you might find in a car's owner's manual. The pressure is dynamic, meaning it changes based on engine speed and load. It's also regulated by a fuel pressure regulator.

Instead of a specific PSI, you'll need to find the correct specification using a GM service manual for your specific engine (5.7L or 4.3L). The manual will outline testing procedures to verify the fuel pressure is within the acceptable operating range under various conditions (e.g., key-on-engine-off, engine running at idle, engine running at higher RPM).

You can try searching online for a "1996 Chevy Z71 [5.7L or 4.3L] service manual PDF" to find this information. Remember to use the exact engine displacement to get the most accurate data. Using a Haynes or Chilton manual for that year and model would also help.