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The "Noise Chopper" is pure junk. It does nothing but CHOP the incomming signal, that is all. Does nothing to "chop" the fuel pump, or other electrical source noise comming in through your antenna. I've tried it, I even bought it from H&Y a few years back, worthless, so please don't waste your money. You need to trace the source of your noise culprit and then go from there. Also, if the noise is comming in through the antenna, don't waste your money on a cb radio power line filter either, it won't help. Vehicle grounding helps some, so does location of antenna. If the problem is the fuel pump, you need to attatch rf chokes and filters in the power lines as close to the pump as possible.
Good luck, LoneWolf TN