Quote:
Originally Posted by Mr Beau
Tattletale retains the highest reading reached. The restriction is most relevant at peak flow so you'd have to watch the gauge while the engine is producing peak power (if it's not a "tattletale").
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You mean a peak hold gauge? No, it always shows the actual pressure differential at any given moment.
The built-in gauge is just one tool in the tool box. I have always relied on fuel pressure data gleaned while the car is running at load in race conditions. As long as fuel pressure does not drop at full load at max RPM, I am pretty confident that the filter is not overly loaded. If the gauge starts to indicate an increased pressure difference at idle, I know I need to start paying closer attention to fuel pressure data.