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One battery or two? Are you plugged into shore power when you to this? Do you have a small digital multimeter for some testing? About $20 or so at most hardware stores and easy to use. That would be helpful here for some testing.
Only testing can tell you that. If you only have one battery you are going to have low voltage issues and once that happens the pump won't develop the correct pressure. Happens all the time. I see this question about once or twice a week here. You have to eliminate the voltage issue first and then go for pressure issues. Since you said you replaced both solenoids, that pretty much eliminates that as a cause. The pump may not be developing enough pressure, but is that due to low voltage or not? Testing is need to find out.
No...........the main cable to the pump relay. That should be a heavy red cable. You want to see over 12.5 VDC under load.
Jumper cables from where?
Does the pump perform when you do that or not? If not, then it is suspect on the pressure it is developing and only installing a pressure gauge would really tell you that.
It usually goes on a tee inserted into the line. You should see something over 2500 psi. This varies with the system. If you can give me which one you have I can give you more.
Then you have to remove that line at the pump and install a tee with the pressure gauge. That would tell you the story.
There is no adjustment for the pressure. They are designed to work at one pressure for that system. How low was it?
Not sure, as we always replace a pump that is bad. And that was too low for sure!
Just checking back in to see if you were able to resolve this issue as I hadn't heard back from you. If not, and you still need additional input on this problem please get back to me. I will make a phone chat offer for you as well in case you fell that might be more helpful.