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If I were to guess, after a few miles and enough bouncing, the fuel pump could move or settle in and the sock or some part of the assembly may now be hitting the tank. That and/or they are just...

Tenderizing? :bowdown:

I'd give my 2¢ if I thought it would make a difference.

It's like oil filters. Do you know why people pay $2 for an oil filter for a $10,000 engine? Because they cant...