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The 324 fuel pump has two vacuum lines that come out of the top. The fuel line comes out of the bottom. One vacuum line goes directly to the back of the wiper motor. The second goes to the vacuum block on the back of the carb to act as a booster and back up when your carb is not producing sufficient vacuum for the power brakes. If you have vacuum at both the top and bottom of the wiper motor then you are creating opposing forces and then it will just lock up. I don't know if you switch vacuum from the rear line to the front if that will cause the wiper motor to run back wards or not. I am going electric so I have a more stable wiper system. Take care
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