On Jul 13, 6:40 pm, Senin wrote:
On Jul 13, 6:27 pm, "James" wrote:

Have you let it run through more than one zone, to determine if you have low
pressure in just one zone, or ALL zones ?

Know this might give you a good hint as to the problem........

James

It's crazy, sometimes they all work, sometimes none work, and
sometimes only one zone will come on full blast (and the others barely
trickle)---- the one that is the farthest away.

I live in the city. Inspected parts of the pipes, some are buried
underground and can't see them. Could it be related to the neighbors?

Based on that description, it is a system pressure problem. I would
install a pressure gauge and see what the pressure is doing both with
the sprinklers on and off and at different times of the day.

I suspect that someone up thread has it correct - all the neighbors
trying to water at the same time.

Harry K