Tech Tip Corner
Testing of Air Bleed
Testing of Air Bleed Equipped Choke Pull-Off
Technicians testing a Choke Pull-off equipped with air bleed holes are reminded
that a large volume vacuum source such as engine manifold vacuum should be used.
A hand-held vacuum pump is insufficient for testing.
When a manifold vacuum source is attached to this style of Choke Pull-off, retraction
of the plunger will occur in approximately 2 to 3 seconds.
The air bleed hole is present to dampen the rate of plunger retraction, preventing a
start-up and stall condition. Choke Pull-offs with air bleeds are identified in the
Borg-Warner brand Fuel Buyers Guide.
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