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Originally Posted by odie
Why would some water kill the IP? Pure water would have no lubrication but the engine would qui running long before the loss of lubrication could even begin to cause problems IMHO.
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You're right...a large amount of water all at once would stop the engine. However, small amounts of free water are the worst. The fit between the IP's plunger and cylinder is an incredibly close tolerance and absolutely must have the lubricating properties of fuel oil in order to prevent scuffing of the cylinder wall. Water isn't all that great a lubricant, especially at 2500+ psi.
Additionally, small amounts of water will cause cavitation in the plunger, pressure/delivery valve assembly and injector nozzles resulting in erosion of the metal in those areas.