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post #8 of Old 03-21-2013
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Re: Return diesel fuel to the tank?

Many of the small Hp Yanmars have the fuel return line connected at the top of each fuel injector. The lines are run together then connect to a hose that takes fuel back to fuel tank. I guess you could connect the line to the fuel intak, but because this fuel return line may have air in it, that could cause a problem by air locking your fuel system. I do not seem to get any fuel returned to the tank through this line at idle (have not checked at full throttle), but the engine runs fine.

I do not understand how the injector works. Is it the fuel pressure that causes the injector nozzel to spray fuel? Why do you need a fuel return. Does not the fuel injector pump meter correct fuel to the injector? I can see where the fuel mechanical pump (or electric if that is what you have) could push too much fuel, but with a diesel, I would think the fuel would be restricted by the positive displacement fuel injection pump.
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