[windy1603]

There is no specific voltage you will see on most normal test meters.

It has a switched PWM voltage supply and the pressure is regulated by the pulse width/duty cycle of the regulator you need a scope to get accurate data.

Its rare for them to become intermittent other than o-rings wearing and jamming the valve they work or they dont

Its more likely to be air leak in the fuel system or not primed properly

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[windy1603]

It must be a sensor or wiring short the HP pump is very unlikely to generate that pressure most can only generate around 300-500 Bar when cranking

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