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Posted: Fri Oct 12, 2012 7:48am

Post Subject: increase in engine revs

Hi Tony, I ran my engine to charge the batteries, which I do every day as I am a continuous cruiser. Quite a lot of smoke is emitted on start up then occasionally the revs will increase 3 or 4 hundred revs for a few seconds and then return to what is was. This occurs with the gearbox engaged or disengaged.This is the first time that this has occured. I know the revs increase when you run out of diesel so could this be the ingress of water in the diesel do you think? I have a tank which is about half full at the moment - 100 litres. thanks Terry.


Posted: Fri Oct 12, 2012 8:11am

Post Subject: increase in engine revs

The only engines that can be relied upon to rev themselves up when they are partially starved of fuel are those that use a hydraulically governed DPA pump so would your engine be a BMC 1.x? When did you last drain your tank of water (assuming it has a drain plug or you can suck from the top)? Do you have a sdeimentor and agglomerator (water traps) fitted or even just one of those? When your fuel filter was last changed was its contents inspected for signs of water & bug? If the engine uses an AC type lift pump (as most BMCs do) when was the strainer under the cap last checked? It could be some form of blockage (including a a lot of water in the filter) or an air leak into the system. Tony Brooks

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