showcrop said: (quoted from post at 19:04:05 07/04/14)
If it is a single phase motor and it has a problem starting at zero pressure it is most likely the start winding switch. They are almost always just under the back end plate.
The OP said it would start OK with zero pressure in the tank, so that takes us back to probably the unloader valve.
Someone mentioned the check valve, before going any farther, I would check it as described.
An electric motor shop should be able to get the unloader, (or go to Sears) and usually not too complicated to replace, if you have some mechanical skill.
Myron
Edit - I see Gordo made a post while I was fumbling keys on my 'puter. Good point, that is a sure way to check that valve. That also will tell you where it is located,
This post was edited by OH - 961 at 15:45:33 07/04/14.
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