Windshield washer help needed
Logistics Pro
Joined: Feb 2011
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From: Townsend, MT
When it gets a hole in it, chances are, it will not "push" and "pull" the exact same volume each cycle. If the hole is such that it causes the bellows to "pull" just a little more than it "pushes", you eventually end up with fluid in the bellows.
Logistics Pro
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From: Townsend, MT
Fleet Mechanic
Joined: Nov 2005
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From: Lehigh Valley, Penna.
Wouldn't any fluid in the lines drain back to the low spot if there was crack then? I have no idea what the level of the pump was relative to the bag but certainly the pump was lower than the nozzles.
Lead Gopher
Joined: Aug 2012
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From: Seattle
Foot-actuated washer
1961-1966 C-CT-F-H-HT-N-NT-T100/1100
1966/68 W-WT1000D
and others, too
If it didn't have the electric pump but did have a pump it would be the foot pump.
Electric pump was only used on some but not all of these models
1965 F100/350 (4x2 presumably meant)
1966 F100, 250 (4x2)
Chad
Logistics Pro
Joined: Feb 2011
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From: Townsend, MT
Any fluid that drains back from the nozzles goes into the "T". It looks to me like the path of least resistance from the "T" would be into the bag, not the bellows.
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Fleet Mechanic
Joined: Nov 2005
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From: Lehigh Valley, Penna.
So without the vacuum to raise the check ball the fluid would drain to the leaking bellows.
Lead Gopher
Joined: Aug 2012
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From: Seattle
On an unrelated side-note I did procure the two sizes of clear vinyl tubing and have cut it into lengths. The two pieces that connect under the hood from the "T" to the jets like on most of our light duty trucks are spec'ed to be 14" long. Other lengths vary depending on how heavy duty and if is has a left hand horn or grill guard. So, I went with 76" between bag and pump and 70" between bag and underhood "T".
One other thing of note. While the top of the bag does seem somewhat higher elevation than the foot pump, the tubing between them has a high point where it passes through the firewall. This *might* negate much chance of draining into a leaking pump. Also, I will not be creating a pinhole in my pump so this is going to be a bit more of a "best case scenario" test as far as equipment condition.
Chad
One other thing of note. While the top of the bag does seem somewhat higher elevation than the foot pump, the tubing between them has a high point where it passes through the firewall. This *might* negate much chance of draining into a leaking pump. Also, I will not be creating a pinhole in my pump so this is going to be a bit more of a "best case scenario" test as far as equipment condition.
Chad
Logistics Pro
Joined: Feb 2011
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From: Townsend, MT
If that was the case wouldn't it always drain back since the bag is not sealed. Also from your previous how it works..... "This vacuum raises the check ball in the "T" and "sucks" whatever medium that is in the bag up the draw straw and into the line connected to the bellows."
So without the vacuum to raise the check ball the fluid would drain to the leaking bellows.
The system would actually be more efficient if the bellows and line were filled with liquid as you would get more of a "true" displacement by doing away with a more compressible fluid such as atmospheric air.
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