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.

 

If it were to try to siphon, air would be pulled from the nozzles first.

 

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.

 

So what years/models does this foot pump come in for the Slick era? The left foot must have been busy working the washer pump, high beams and clutch!!

 

I'm going to go today and try to find some clear tubing of the correct two sizes and then I'll put some food coloring into the water I put in the reservoir bag and then I'll be able to watch the action happen in real time.

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

 

 

Here is one that I got that I was going to use for my 56, probably not going to use it. Gives an idea of the older style.

 

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.

 

 

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

 

Yes, yes it would if the check ball has a good seal.

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.