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Hello everyone. I'll tell you a little about the diesel Voyager's humming. What can be done to stop it from humming without buying anything. I forgot to mention that some people also recommend putting metal caps on the valves from the zapor, which are just the right size. But I think it's the same as welding a little metal onto the rocker arm. I remember once I wanted to find out the price for them, but they weren't available anywhere.