Since the pump was running constantly...i would say that the "hissing" is just the fuel pump sound.
Another guess would be bad fpr which is failed internally,returning all fuel back to the tank all the time.
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- 28 Jan 2019, 08:00
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Re: Volvo S70 not starting - Hissing sound near fuel filter
Late 850 with M4.4 like mine have the same setup.






