Re: F-12 problem

Posted by David Allgire on October 04, 2006 at 20:06:19 from (71.81.228.179):

In Reply to: F-12 problem posted by MT on October 04, 2006 at 13:02:29:

The cast iron "thing" on top of the hood is to handle the overflow of the fuel pump. The fuel pump is operated off of a rod that rides on a cam lobe. Every time the cam lobe pushes on the rod, fuel is pushed up through the line that runs to the overflow chamber by the use of two check valves in the top of the fuel pump. The overflow chamber has two lines out the bottom. One has a tee in it. One side of the tee comes from the fuel pump, the other goes to the carburetor. The other line is almost twice the size and is plumbed back to the intake line from the fuel tank to the fuel pump. What fuel is not required by the carb is sent back to the intake by the larger return line. The plug on top of the overflow chamber is vented by a small hole drilled into the side of the plug. Yes, you can prime the carb line through the vent plug on top. Just trying to clarify how this particular system works.

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