Posted by jdemaris on October 17, 2013 at 10:54:37 from (70.192.14.204):
In Reply to: fuel injection pump posted by joseph h moore on October 17, 2013 at 05:25:10:
I'm not sure exactly what your question is. I assume you've got a Roosamaster/Stanadyne rotary-distributor pump. Probably a DBG429 model. It is composed of two pumps and a governor all inside one "container."
The back has a rotary vane pump that has two jobs. #1 it can draw fuel from 20 feet below it and eliminate the need of an external fuel pump if wanted. #2 it delivers a flow of low pressure fuel to the 2nd pump. On later models like it also powers the hydraulic automatic advance.
In the center is a set of two pump plungers that are forced to move up and down by a cam-ring. They make the high-pressure, low flow fuel charge that goes to the injectors.
It is a "self contained" system and there is nothing else needed except injectors for the fuel system to work. That being said, an external fuel pump is often used to make filter bleeding easier unless the fuel tank is higher then the engine.
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