Problem: Fuel flows through the
controller when the tank is pressurized and the engine is not
running.
TRY THIS
FIRST! Dirt may be under the needle valve in the controller. Remove
the fuel line from carburetor and connect it to your fuel pump and
suck fuel through the system. This will cause the needle valve to
open wide and wash small dirt particles out of the controller.
If the above does not solve the
problem, you will have to take the controller apart and clean it.
Don't be afraid to take it apart, but don't lose the spring under
the lever.
Look for following problems in
assembly of the controller. Gasket is on the wrong side of the
diaphragms or the lever is adjusted too high, should be level with
the inside bottom of the controller.
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Problem:
No fuel flows through the controller when the tank is
pressurized and the engine is choked.
Plugged fuel filter
Pinched fuel line
Foreign material on inlet of controller or no fuel in tank.
Diaphragm in controller is upside down.
After sitting for a long period of time the controller may become
oil-logged. Oil may be under the needle valve in the controller.
Remove fuel line from carburetor and connect it to your fuel pump
and suck fuel through the system. This will cause the needle valve
to open wide and wash oil out of the controller.
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Problem:
Needle valve cannot be opened enough to get a rich
mixture.
Hole
or leak in line from center of controller to the carburetor.
Not
enough pressure in tank (2 to 12 PSI is required).
The
use of a pressure feed carburetor can cause the same problem.
Change to a suction type carburetor.
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Problem:
Unable to build up 2 to 12 PSI pressure in fuel
tank.
Check valve may be installed backward (small brass end [inlet]
should be towards engine).
Check
valve may be dirty (remove and clean or replace).
Pinched vent line or hole in vent line.
Sometimes a NEW check valve sticks closed. Push a small
blunt object into the check valve in the direction of flow.
This should release it.
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