Kevin,
The fuel flow restrictor is only in the output of the fuel pump. This
restricts the fuel flow to just many times what the engine can use at
continuous full power. The extra goes through the overflow back to the wing
tanks.
No matter how long I did a full power climb up to 12,500', my nose tank
always stayed full.
The fuel flow from the nose tank to the carburetor is gravity powered and
should be unrestricted - unless you have something wrong.
Things wrong with the nose tank to carb fuel flow could include
* gas line ice in really cold conditions
( http://ercoupe.org/Fly-in%20Reports/Gas-line-ice.htm ),
* sloshing compound coming loose and blocking the outflow,
* a fuel line that is collapsing internally while looking perfect on the
outside,
* something else causing a fuel flow obstruction,
* a carb float that's stuck or sinking, etc.
The only time I got a fuel flow failure from the nose being too high was in
a full power climb with a 7146 climb prop at about zero degrees in the
winter, flying solo. The nose was up WAY high. I didn't have to do
anything - as soon as the rpms dropped, so did the nose and power returned.
Ed
