Quote:
Originally Posted by ka-t_240
Likely.... this is related to the internal pump pressures and flow thru the pump. My dad works exclusivenly with high pressure fuel pumps(rebuilding and calibrating), when he heard the noise, he said it sounds like a pump with air in it on his test benches or when the pressures are too high.
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Your dad isn't too far off. The TSB related to this actually mentions cavitation in the pump being the likely cause of the noise.