Re: 71 Windshield Washer Pump Question
All of the seals must seal for the pump to suck (and hold) water on its own properly - this includes not only the piston seal, but also the 5 small round interior umbrella valves, and the two larger round seals partially visible from the outside. You can put a little water on either side of the piece with the umbrella valves to see if they leak. If they do you can replace them with new ones from the rebuild kit.
In my experience the larger outer seals usually fail to seal and these cannot be replaced. If these are not sealing the pump will not suck nor hold water. And the only way I've been able to tell if they are sealing is to blow into the pump as I described above.
All of the seals must seal for the pump to suck (and hold) water on its own properly - this includes not only the piston seal, but also the 5 small round interior umbrella valves, and the two larger round seals partially visible from the outside. You can put a little water on either side of the piece with the umbrella valves to see if they leak. If they do you can replace them with new ones from the rebuild kit.
In my experience the larger outer seals usually fail to seal and these cannot be replaced. If these are not sealing the pump will not suck nor hold water. And the only way I've been able to tell if they are sealing is to blow into the pump as I described above.
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