Re: Air in fuel system

Posted by P Backus on August 13, 2005 at 07:09:08 from (69.128.32.190):

In Reply to: Air in fuel system posted by Bill from Florida on August 12, 2005 at 21:26:51:

I have a DT436 that"s doing the same thing. After working a few
hours, the engine will die and won"t restart for a while. I",m
suspecting a weak charge pump or injection pump. The
tolerances in the injection pump especially are so close that as it
warms up it changes just enough that it won"t deliver enough
fuel. If a line was blocked or had a hole in it somewhere, why
would it wait 2 or 3 hours to stop? The injector cooling/return
line system is constantly purging the fuel in the pump, so if and
air bubble gets in there, it would likely go out the return line
without causing the engine to stumble even. Can you see where
the return line goes into the fuel tank? Sometimes it enters the
tank right where the filler neck is and you can see it flowing
when you take off the fuel cap. That flow will probably stop
before the engine quits if the charge pump isn"t delivering
enough fuel. If it"s the injection pump, then you just need a
rebuilt one.
Paul

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