I have just rebuilt our Fynspray water pump, through tech advice left here by members, I was able to buy a new leather washer. I honed the brass fittings with steel wool & fitted a rubber o ring to the moving shaft, where there was a worn out leather washer. I also coiled the hose under the sink to prevent total drainage back to the tank. Question: The pump only delivers water on one stroke? I would expect it should deliver on both strokes? The new washer has made it stiff to operate, I expect this will loosen up.
Hi MUstang Technical questions are certainly not my forte, which is why it's so good to have the technical section here. Looking at the reference stuff here, former member Reddo said this:
"How do they work?...
The basic operation of these pumps is that when you raise the plunger you suck water up into the pump housing, and when you push the plunger down the water in the housing is forced out of the spout into the sink. Pull up - suck water up; push down - spurt water into sink. There appears to be at least two different methods of how the sucking and spurting works. One uses a captive ball stopper method to open and close the outlets as you pump the handle, and another uses a tap washer type arrangement. One also has a cupped leather or nitrile washer at the bottom of the plunger, and the other uses a flat nitrile washer."
So it sounds like the pump only sucks water on one stroke. I don't know what coiling the hose would do as I've not heard of doing that. As I will have one of these pumps in Cino Vardo, I would be interested to know the reason for doing that.
I also had one of these pumps in the Hunter Minor and fitted a new leather bucket. It took some time for it to work satisfactorily and I put it down to the leather needing to get well and truly soaked. So perhaps in time yours might improve. I'm not sure about where you fitted the O ring - perhaps a pic would help?
Hi Roehm, Yes to all you said, sounds like it is working as it should, all but a bit slow. The idea of the coiling the hose came from an old caravan book by Keith Winser, The coil is suppose to act as a prime with water trapped in the lower section of the coil, this is suppose to save drawing the water all the way from the tank??
The rubber o ring is fitted to the top of the round shaft that holds the leather washer, I don't think it would have a bearing on the pumping action.
I will fit a 12v pump as well, they seem to have fallen a lot in price. link
Hi Mustang. Interesting comment about the coiling. I have not heard of that before (nothing new there!). I wonder if you or anybody out there knows the physics behind that? Perhaps it would also depend the distance of the run from tank to pump. A wise old head like cobber might know the answer!!