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Dec27-10, 10:19 AM
Sci Advisor
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P: 2,248
Diesel direct injection systems operate at very high pressures, and the valve is only there as a last resort in the event of a rare unexpected overpressure of the fuel system. It shouldn't need to operate many times, because it's protectting against a rare event. How many times this kind of a safety feature can operate will depend on the vehicle, on some vehicles it could be more of a burst disc and only operate once before needing replacement.