400 L4-156 2.6L (1982)
Altitude Compensator: Description and Operation
Fig. 29 - High Altitude Compensation System
PURPOSE
This system is used to maintain the correct air fuel ratio at high altitudes.
OPERATION
An aneroid bellows, Fig. 29, is mounted on the body panel in the engine compartment and connected to the carburetor with hoses and is vented to
the atmosphere through the top of the carburetor. As atmospheric pressure expands or contracts the bellows, the brass tapered seat control valve
regulates the air flow to the main air bleeds.
During high altitude engine Operation, the fuel mixture tends to become richer due to low atmospheric pressure. When the atmospheric pressure
reaches a predetermined value, the aneroid begins to open, allowing air to enter the main air bleeds.This auxiliary air, in addition to the present air
source, provides the system with the proper amount of air necessary to maintain the correct air fuel ratio.
This system supplies varying amounts of additional air depending upon the altitude. When sufficient atmospheric pressure is restored, the valve
closes and system returns to its normal operation.
