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OK, reckon I have finished my rough running issues. Dropped the contents of the fuel tank, about 30 litres, after dosing it with algae killer and cold weather anti gelling fluid. Fuel was a mix of dirt, water, algae whatever, it was filthy. New filter was clogged again, was running but not that healthy. Flushed it out with 4 Litres of metho to chase out the remnant water, then new filter and 40Litres of fresh stuff, left the lift pump to do its stuff for 30 mins and fired up first go. No doubt there is some residual material left in the lines and pump, will change over the filter in 500klm, and should be sorted. Hope this is the end of it, unsure if its a long term issue or a crappy batch of fuel. Engine sounds so much better and smoother.Contaminated Fuel 4.jpgContaminated Fuel 3.jpgContaminated Fuel 2.jpgGood Fuel 1.jpgContaminated fuel 1.jpg