
Garretson Model KN Fuel Valve Considerations
General
The KN is designed for sensitivity and simple operation. It is used with
Operation
The KN is an atmospheric zero governor which acts like the float and needle valve in a gasoline carburetor.
A properly adjusted KN requires a vacuum of only 0.25” to 0.35” of water column to start the opening sequence. Due to this sensitivity, most installations do not need priming to start unless low cranking speeds or restricted and lengthy piping are required. If priming is necessary and a manual primer is installed, use only 1 or 2 second bursts of fuel and immediately try to start the engine. If there is a choke on the carburetor, do not use it as this will probably cause flooding and hard starting. As you can see, the operation of this unit is simple and basic. If you are having trouble operating the engine, in most cases the fuel controller is not malfunctioning. There is generally a problem with the engine or fuel supply. so do not make adjustments or attempt to service the KN until you are sure it is needed.
Figure 4-14 Garretson KN Fuel Valve
Outlet
Mount
Primer (Optional)
Adjustment
Inlet
Mount
Service
The KN should be periodically checked for leakage past the valve seat and the vents on the cover kept clean and free of obstructions. If the KN needs service we suggest you take it to a qualified serviceman. If that help is not available Garretson will furnish you a list of repair shops with the proper service information.
MN2408 | Operation |