| caused by fuel in the injector, but water out side of it. I understand the general consensus is the ethanol in the fuel is causing the failure of the injectors, but based on what I have seen I feel it has more to do with the connectors than the fuel. With the old style connectors the gasket to keep water out is easily bypassed once the connector gets old, brittle and cracks. This is why the corrosion on the pins occurs. Its not hard to believe that with a little time and the constant 12V supplied to the injector that water will get passed the two O-rings and into the coil. This seems much more likely than the path the fuel will need to take to get into the coil, and the corrosion can occur without the water getting into the coil just onto the pins past the connector. 
As you can see in this photo from the OP. The coils are quite clean and show no signs of corrosion but two wires coming out of the top(where the connector goes) are showing signs of dirt and corrosion. Presumably this area is located under the two O-rings located just under the connector (See below). 
From everything I have read people with failed injectors replaced the connectors at the same time because they were broken(new old style), and the ones who didn't lost one of the replacement injectors within a year or two. The new style injectors have a new connector which decreases the chances of seal failure. This in turn prevents water from reaching the pins, thus decreasing corrosion and failure of the injectors. Nissan went through a lot of trouble redesigning the connectors. If all that was wrong is the materials inside the injectors then the connectors didn't need to be redesigned and the old style injectors would have been updated as well, but due to the change in connector I feel there is a lot more going on then ethanol compatibility. I feel good connectors and removing the 12V is all that's needed to prevent failures. If I am missing something please let me know.
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21:50:27 01/21/10
