IF I understand what you are saying. If you remove the vent from your
header tank you will have an air chamber. You will not be able to fill
the header tank as air pressure will build and prevent fuel from
entering. The only way the air will be able to escape is through the
carburetor. You may consider a float valve in the vent which closes when
fuel gets near the top of the header tank. This would vent the tank and
allow normal operation, but not let the pump overflow the tank.
Russ Breckenridge, MN asir...@702com.net
