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Fill boiling water canner with water.
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Place three clean half pint mason jars in canner over high heat.
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Place snap lids in boiling water; boil 5 mins to soften sealing compound.
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Combine syrup, water and sugar in a large pan.
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Bring mixture to boil, stirring constantly; boil hard 1 minute Stir in pecans and vanilla.
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Return to a boil; boil hard six minutes.
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Ladle syrup into a hot jar to within 1/4 inch of top rim (head space).
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Remove air bubbles by sliding a rubber spatule between glass and food; readjust head space to 1/4 inch.
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Wipe jar rim removing any stickiness.
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Center snap lid on jar; apply screw band just until fingertip tight.
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Place jar in canner.
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Repeat for remaining syrup.
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Cover canner; return water to boil; process 10 mins at altitudes up to 1,000 feet.
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Remove jars.
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Cool 24 hours.
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Check jar seals (sealed lids curve downward).
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Wipe jars, labeland store in cool dark place.