I believe I have a deep well jet pump system (Jet pump in crawl space with 2 plastic pipes leading under ground). Recently, when the pump turns on, a terrible vibration noise is present for approx. the first 15 seconds (In most cases the noise stops, in some cases it remains for the entire cycle). Assuming the pipe hangers loosened, I replaced and added pipe hangers until I am about nuts. The noise is still present. Is my approach to this vibration to elementary? Can I have a pump/tank problem that needs to be addressed?? Please, any suggestions would help. I am about to go off the deep end with this noise.