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How to Test a Vacuum Break / Pulloff
 
Checking with hand held vacuum pump:
1) Determine if the choke pulloff has a built-in air bleed (leak). If it does, it must be plugged prior to testing.
Most rear pulloffs have an air bleed, Most front pulloffs do not.
 
2) Using a hand held vacuum pump, apply 15" Hg** vacuum to the choke pulloff.
    The pulloff plunger should move full travel. Apply finger pressure to plunger to verify that it has moved though its    full travel. If it has not, replacement is required.
The choke pulloff diaphragm should hold for at least 20 seconds.
** If 15HG of vacuum cannot be applied, test the pull-off on a running engine, as hand vacuum pumps may not supply enough volume of vacuum to functionally test pull-offs with air bleeds.
 
Checking on a running engine:   (BEST Method)
1) Apply engine vacuum to pulloff (At least 15" Hg) It is not necessary to plug air-bleed if so equipped. The pulloff plunger should move full travel. Apply finger pressure to plunger to verify that it has moved though its full travel. If it has not, replacement is required.
 
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