electronic fuel pump???

67Dart273 said

I run a lowly Holley red pump and cannot believe how noisy it is. I spent considerable effort building rubber isolators for it -- both between the pump and the clamp, and big rubber isolators between the bolts and the clamp. It has rubber connector hoses to the metal line.

It doesn't really bother me that much, but I REALLY expected it to be quieter

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Rubber isolators will stop vibration transfered to the car but do very little for the sound. Cover the pump with something like a plastic container and muffle the noise. An irregular shape like egg cartons will drasticlly reduce sound travel. just remeber when you capture the sound you are also capturing the heat.
Ever see the film Fireball 500 ? The guy muffled a turbine engine with a garbage can. I did the same thing to a small vibra-tumbler at a machine shop where I worked. The garbage can didn't fit its diameter but a igloo type dog house worked well. Coworkers nicknamed my creation Hush Puppy LOL