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Beta 28 engine

I have a Beta 28 engine in my narrow boat, it has appx 130 hrs on its clock. Why does it not want to rev for the first minute after cold starting sometimes, but at other times it does. After running for around one hour the engine starts hunting, the revs fall slightly and then pick up again. Also while checking the diesel fuel system I found discoloured fuel in the system between the fuel filter and the injector pump, any idea why?

Asked by: Tom Brady  | 7.24pm, Wednesday 4 November

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