Is it possible it was just checked during one of those "good" moments though?
And the downloadable manual suggests that "Key On" fuel pressure should be between 333-376 kpa (48-55 psi).
If the problem is intermittent like you described, who knows if even the comparably low pressures you read remain constant under actual load/driving conditions.
Hmm. I am curiious where you found that in the manual.? I couldn't find it. Thinkin then I should go for FPR replacement.