GIlow - in the interest of science i checked my
perkins engine manuals. they gave no reason as to why the injection
pump pushes out more
fuel than the injectors can use. they did show a
fuel flow diagram which actually shows the injectors branching off the main fuel line which leads back to the
fuel tank - almost as if the injectors were put there as an afterthought.
in any case, while i was running my 4=108 today i decided to 'listen' to the sound of fuel being returned to the tank (i only have one). my tank is located under the main
salon and easily accessible. there was a steady flow of fuel - not a drip, drip, drip, and not a rushing stream, just a slow steady flow.
i'm thinking that the fuel may not be so much a
coolant for the injection
pump as a lubricant.... but it's all conjecture on my part.