Re: Fuel bowl draining …

Posted by HH56 On 2021/9/13 18:55:29
You didn't mention if the filter is the optional in line type mounted next to the carb or is the type mounted directly on the old prewar fuel pumps.

Assuming it is the optional type next to carb, I suspect even though you are not smelling gas it is being percolated out of the bowl into the carb and manifold or more likely, since todays gas is so volatile residual heat could be making it disappear as a vapor rather than a liquid.

If the filter is the optional ceramic or paper type with the glass bowl and the placement and plumbing is correct, there should be no way for the fuel to siphon back to the pump or out a faulty flare in the line. The inlet and outlet ports exist as just flat openings in the top casting separated to function for the filter element by the gasket and a couple of thin protrusions in the casting. They are above the filter element and fuel level. As soon as fuel drops in the glass bowl it should allow the air at the top to break any suction. There are also valves in the pump which would work effectively the same way as a check valve if fuel was trying to get thru the pump. Those must be working because the pump is able to function.

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