The trick when mounting an external pump is to mount it completely to rubber and then mount the rubber to the steel of the car, completely isolating the pump and thus the noise. Use a length of maybe 2 or 3 inches of non-metal fuel line hose on the suck and the push side of the pump, then run your metallic lines from there.
Here's an example of what I have used over the years.....
https://www.summitracing.com/parts/s...11-2/overview/

You will also want to mount a filter on each side of the pump and check them regularly for cleaning.

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