You will not find a single "correct" fuel pressure value in a general manual or online. The correct fuel pressure needs to be determined using the official Caterpillar service manual for that specific engine's serial number. This manual will provide detailed specifications and diagnostic procedures for your engine.
To find the correct specification, you need to:
1. Locate your engine's serial number. This is usually found on a plate attached to the engine block.
2. Find the appropriate Caterpillar service manual for your engine's serial number and model year. Caterpillar's website or a reputable parts supplier should have access to these manuals (often for a fee).
3. Consult the manual's fuel system specifications section. This section will provide the correct fuel pressure range at idle for your specific engine.
Attempting to diagnose or adjust fuel pressure without the correct specifications and procedures from the official service manual is dangerous and can lead to engine damage.
