Join Date: May 2011
Location: Frederick MD.
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No, the PCM doesn't moniter fuel pressure in any way. There is nothing that will tell you you have low fuel pressure without hooking up a manual gauge. Usually the symptoms of low fuel pressure are low power under load, random injector faults, and maybe harder starting.
When's the last time you did fuel filters? I had a truck the other day that had low power and boost looked low. I swore it was a turbo/boost issue. Checked it out more and found fuel pressure low, and when you got it under load fuel pressure was dropping down to 20 psi. Changed fuel filters and fuel pressure came back up and boost was much better.
Ask him if he checked fuel pressure, at idle and under load, and what the numbers were.