have a vortec 5300 in 68 camaro with walbro gss340 pump in a fuel sump pan with return-style pressure regulator set to 50psi

old pump sometimes made lower pitched humming sound

noticed the sound changed when i had the turn signals on. there was no fuel pump relay installed. doh!

installed relay & replaced pump assuming humming sound was due to lack of power & pump may now be damaged

now the new pump has a higher pitch whine, play attached file to hear

there is plenty of power to the pump now as both relay & battery are in the trunk above the fuel tank

what would cause this noise from the pump ? could the sound be due to a vibration in the sump ?

many thanks for any input offered

 

 

deatschwerks pump is nearly inaudible, thank you for the recommendation