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Windshield washer fluid not spraying after empty and refill

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Hello, the front windshield washer fluid is no longer spraying on my 2002 E320 4Matic wagon. When it was working, the fluid level got so low that spraying eventually sputtered to a stop. I refilled it, but it won't resume spraying. The rear sprayer is working fine. I do hear the front fluid pump trying to work when I push the button, and the wipers do their few wipes afterward.

Could there be air in the lines from when it ran dry? Vapor lock? Is there a way to prime the system to get the fluid moving again? Thanks.
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