Posted by Dave Allgire on January 04, 2008 at 08:22:18 from (24.217.155.142):
In Reply to: f-12 gas regulator posted by 52 G on January 03, 2008 at 19:26:58:
First, its not a "regulator". Its correct name is "fuel line vent". A description of its function; the fuel pump draws fuel from the gas or distillate tank. It pumps it to the fuel line vent chamber. The fuel then goes to the carburetor inlet or overflows inside the vent back through the large return to a tee at the inlet to the fuel pump. As has already been said, this fuel continues to be recirculated until the float opens up to admit more fuel to the carburetor. The plug on top of the vent chamber has a small hole drilled through the side to admit air as needed. The plug can be removed and gas added to restart after running out of distallate. (already mentioned) This vent chamber, open to the atmosphere, provides the "pressure relief" of the AC style pumps. On a gasoline model tractor only, yes, there is a tee at the top of the fuel tank that provides for the overflow of fuel not used by the carburetor. The venting is provided by the gas cap on the fuel tank.
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