Posted by Owen Aaland on September 03, 2008 at 22:15:25 from (65.161.86.52):
In Reply to: 560 diesel posted by oldfarmer on September 03, 2008 at 15:26:19:
oldfarmer said: (quoted from post at 15:26:19 09/03/08) That is what I thought. That is why I changed the fuel filters. I am getting good flow to the pump.Could a partially blocked return line cause this problem. Maybe I need to check that
The RoosaMaster pump depends upon a pressure differential between the charge pump pressure and the case pressure to fill the high pressure pistons. A restriction in the fuel return system will cause a rise in case pressure and result in decreased fuel delivery to the injectors. The most common cause is the governor weight retainer crumbling and plugging the fitting on top of the pump. When the ring breaks up the resulting pieces look something like used coffee grounds.
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