Hi, My pump was noisy too and I installed a new stainless pickup hose to irradiate the problem of the collapsing fuel line. But the noise was actually coming from the hose that goes from the pump to the fuel line on the frame, make sure that you have some good soft padding around this line or the vibrations from the fuel pump travel into the plastic under body. This was the problem on mine and since adding some pipe lagging to the bit of hose that touches the under body the noise has gone away whether the engine is warm or not. Hope this make some sense!! James RG England