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The vacuum line from the intake manifold does not go to the wiper motor - it should go to one of the ports on the bottom of the dual-action fuel pump. Another line should run from the other port on the bottom of the fuel pump to the wiper motor.
You have a 50-50 chance of getting the port connections on the bottom right.
The ports might be labelled:
"Manifold" or "In" goes to the intake manifold vacuum port.
(Might also be labelled "L1" or "1").
"Wiper" or "Out" goes to the wipeer motor
(Might also be labelled "L2" or "1").
Are the ports on the bottom of the pump labelled?
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