Posted by Dave Allgire on August 04, 2009 at 14:55:19 from (96.35.216.238):
In Reply to: F 14 fuel system posted by JLE on August 04, 2009 at 11:18:57:
You are probably thinking of the fuel line vent made out of cast that sticks up through the hood right in front of the fuel tank. It has a plug on top of it with a bleeder hole drilled into it. It works on the same principle. There is a pressure line from the fuel pump to the vent at a tee at the bottom of the vent. The other side of this tee goes to the carb. There is also a larger line, about 3/8" that comes out the bottom of the vent and goes to a tee in the line from the tank to the fuel pump. This is a return line for the excess fuel the pump puts out and the carb can't use. The internal construction ensures there is always positive pressure on the line to the carb and the excess overflows into the return line. As said, the same principle, just a different way of doing it. It is a matter of gravity. If the vent housing is working correctly, the line to the carb stays full, and any excess is returned to the intake of the fuel pump. That's why the vent in one case and the tee in the top of the tank being the other case, are higher than the inlet to the carb. Hope this clears things up.
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