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Vacuum wipers |
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AMXCITED
AMC Fan Joined: Sep/25/2018 Location: Long Island, NY Status: Offline Points: 7 |
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Posted: Aug/04/2022 at 2:03pm |
Have a ‘69 AMX with vacuum wipers. Rebuilt the motor and it worked great off the car. Added a vacuum canister to help, but they still don’t work. Any ideas or suggestions?
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sweatlock
AMC Addicted Joined: Apr/28/2014 Location: Largo, FL Status: Offline Points: 3285 |
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Aren’t they run off the fuel pump? How’d you test it?
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AMXCITED
AMC Fan Joined: Sep/25/2018 Location: Long Island, NY Status: Offline Points: 7 |
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Thanks for your response. Vacuum coming from intake manifold. Wiper motor worked fine out of the car unattached to the wiper arms.
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sweatlock
AMC Addicted Joined: Apr/28/2014 Location: Largo, FL Status: Offline Points: 3285 |
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I don’t know how that would work off intake manifold vacuum - they’re supposed to operate off the fuel pump - below is a photo taken from the APD website:
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turbo
AMC Addicted Joined: Oct/26/2008 Location: chicago area Status: Offline Points: 2566 |
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When everything is in good condition they work well enough. If they're not working you have some component not carrying it's load
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they call me Capt RETIRED!
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sweatlock
AMC Addicted Joined: Apr/28/2014 Location: Largo, FL Status: Offline Points: 3285 |
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BU1
AMC Addicted Joined: Aug/11/2016 Location: MN Status: Offline Points: 1973 |
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The vacuum line from the pump Y's into the PCV line. The fuel pump is to assist the wiper motor when manifold vacuum is low. |
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AMO #2726
#1 1968 AMX Rally Green 343 Z code 4spd since 1975 #02642 #2 1968 AMX Rally Green 290 N code 4spd since 2019 #02959 |
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AMXCITED
AMC Fan Joined: Sep/25/2018 Location: Long Island, NY Status: Offline Points: 7 |
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Thanks again. I don’t have an original fuel pump on my motor. It’s been changed before I owned the car.
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ramblinrev
Moderator Group Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11476 |
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Dual fuel pump and missing line (?) is probably the answer.
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74 Hornet Hatchback X twins (since 1977)
62 American Convertible (still worth the $50 I spent in 1973!) AMCRC #513, AMO #384 70 AMX 360 4-speed (since 1981) |
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bigbad69
Supporter of TheAMCForum Joined: Jul/02/2007 Location: Ottawa, Ont. Status: Offline Points: 6614 |
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Do you have a "lumpy" cam? That can also reduce vacuum to the wipers.
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69 Javelin SST BBO 390 T10
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