no…. in my opinion they failed the “usual” test
on my “older” pump I could easily use my mouth to blow air IN to OUt as the valves allowed simple mouth pressure to override the check valve with almost a whistle like sound .
In the reverse OUT to IN direction I could not push air backwards nor could I “suck” air on the IN nipple
on the $6.99 I can not simply blow air IN to OUT. air comes out all over the place ex: the side bolt mounting holes and the small diaphragm vent holes. I even tried pushing water and it leaks out under the top brass plate.
I can also blow air OUT to IN with air passing out the side edges and bolt mounting holes .
All this got me to order 2 B&S pump and a couple of NPT adapters as I readied to tap the cover plate to install a pulse nipple …when I I got an older pump from my parts bin to do a “last chance” trial before tapping the cover plate….
when I checked the pulse hole with a small tye wrap to poke it free of any debris O.M.G . I could not push the tye wrap all the way into the side cover plate/crankcase cavity .
A close exam of the problem explained why. my holes got off-set when I flipped the plate over .
None of all this would have happened if the side plate had not been filled with JB weld .
The J B did the job perfectly 🙂 .. it stopped the vacum pulses from passing from the misaligned side cover plate hole onward to the aluminum plate pump base gasket hole.
As to the $6.99 “air leaky” pumps….it all remains a mystery …
wish I had myself a “home made pulser” to try them out on the bench…. canola oil should be a nice, non smelly easy flowing fluid to test them but…installing them properly would greatly help 🙂
Joining AOMCI has priviledges 🙂
