Pressure Tank / Toilet issue

[J Blow]

My knowledge of pressure tanks is very limited so what I think is happening (and using the right terms is another issue) may be just a generally uninformed senseless thought....but I'm guessing others can give me an idea of this is possible and what the fix is, if not.

So, have a standard well, small pressure tank setup in a small vacation cabin. I have decent but not great water pressure. After sitting for a couple days, and I think it's when you use the toilet first and no other water, flushing the toilet doesn't trigger a toilet refill. I believe when you run the water elsewhere it then kicks on and fills.

I am guessing that the pressure tank 'leaks down' and doesn't provide enough water pressure at the toilet valve to fill the tank until water is run elsewhere and makes a 'call' for water/pressure.

Could it simply be a bad toilet valve or maybe a combo of the two or am I possibly way off altogether?

Thanks.

 

[Breplum]

You'd have to measure the house pressure from a hose bibb to know what the pressure is.
And freshening up the ballcock gasket if it is a Fluidmaster 400 series never hurts.

 

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[J Blow]

So does it sound possible it's just a pressure issue, though? Would it be possible that the toilet valve isn't refilling when the water level drops but then starts refilling after water is run and be anything but a pressure issue? That's what is confusing me.