Davo and I have been discussing it since it happened and we reckon potentially the pump was worn before I got it. The pump didn’t show signs of major rust sitting in it, however I am certain that it must have had water sitting in it. Maybe the acidic flood juice has etched the surfaces inside the pump, further increasing pumping losses. Either way we cannot pin-point the issue, but I will admit that the flood water was probably the culprit.

Could be a leaking exhaust manifold? Very difficult to tell mate, but I wouldn’t expect the injector pump to cause that noise.